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  Subjects -> ENGINEERING (Total: 2291 journals)
    - CHEMICAL ENGINEERING (192 journals)
    - CIVIL ENGINEERING (187 journals)
    - ELECTRICAL ENGINEERING (105 journals)
    - ENGINEERING (1209 journals)
    - ENGINEERING MECHANICS AND MATERIALS (385 journals)
    - HYDRAULIC ENGINEERING (55 journals)
    - INDUSTRIAL ENGINEERING (68 journals)
    - MECHANICAL ENGINEERING (90 journals)

ENGINEERING (1209 journals)            First | 1 2 3 4 5 6 7 | Last

Showing 1001 - 1200 of 1205 Journals sorted alphabetically
Process Technology Proceedings     Full-text available via subscription  
Processes     Open Access  
Production     Open Access  
Production and Operations Management     Hybrid Journal   (Followers: 13)
Production Engineering     Hybrid Journal   (Followers: 5)
Production Planning & Control: The Management of Operations     Hybrid Journal   (Followers: 10)
Progress in Agricultural Engineering Sciences     Full-text available via subscription  
Progress in Computational Fluid Dynamics, An International Journal     Hybrid Journal   (Followers: 7)
Progress in Energy and Combustion Science     Full-text available via subscription   (Followers: 10)
Progress in Nanotechnology and Nanomaterials     Open Access   (Followers: 4)
Progress in Photovoltaics: Research & Applications     Hybrid Journal   (Followers: 6)
Progress in Polymer Science     Full-text available via subscription   (Followers: 34)
Propellants, Explosives, Pyrotechnics     Hybrid Journal   (Followers: 292)
Propulsion and Power Research     Open Access   (Followers: 26)
Puente     Open Access  
Purinergic Signalling     Hybrid Journal   (Followers: 1)
Quaderns d’Història de l’Enginyeria     Open Access  
Quality and Reliability Engineering International     Hybrid Journal   (Followers: 14)
Quality Engineering     Hybrid Journal   (Followers: 9)
Radiochimica Acta     Hybrid Journal   (Followers: 5)
Rapid Prototyping Journal     Hybrid Journal   (Followers: 4)
Rare Metals     Hybrid Journal   (Followers: 1)
Reactive and Functional Polymers     Hybrid Journal   (Followers: 5)
Recent Patents on Engineering     Full-text available via subscription   (Followers: 3)
Recent Patents on Nanotechnology     Full-text available via subscription   (Followers: 3)
Recherche Transports Sécurité     Hybrid Journal   (Followers: 1)
Redes de Ingeniería     Open Access  
Regional Maritime University Journal     Full-text available via subscription   (Followers: 2)
Regular and Chaotic Dynamics     Hybrid Journal  
Rekayasa     Open Access  
Rem : Revista Escola de Minas     Open Access   (Followers: 1)
Remote Sensing     Open Access   (Followers: 45)
Remote Sensing Letters     Hybrid Journal   (Followers: 40)
Requirements Engineering     Hybrid Journal   (Followers: 3)
Research Ideas and Outcomes     Open Access  
Research in Engineering Design     Hybrid Journal   (Followers: 11)
Research Journal of Nanoscience and Nanotechnology     Open Access   (Followers: 20)
Research Works of Air Force Institute of Technology     Open Access   (Followers: 1)
Resonance     Hybrid Journal   (Followers: 29)
Reviews in Advanced Sciences and Engineering     Partially Free   (Followers: 2)
Revista AIDIS de Ingeniería y Ciencias Ambientales. Investigación, desarrollo y práctica     Open Access  
Revista Brasileira de Engenharia Agrícola e Ambiental     Open Access   (Followers: 1)
Revista Ciencias e Ingeniería al Día     Open Access  
Revista CINTEX     Open Access   (Followers: 1)
Revista de Engenharia da Universidade Católica de Petrópolis     Open Access  
Revista de Ingeniería     Open Access  
Revista de Ingenieria Sismica     Open Access  
Revista de Investigación, Desarrollo e Innovación     Open Access  
Revista EIA     Open Access   (Followers: 1)
Revista Facultad de Ingeniería     Open Access   (Followers: 1)
Revista Facultad de Ingenieria - Universidad de Tarapaca     Open Access   (Followers: 1)
Revista Facultad de Ingeniería Universidad de Antioquia     Open Access   (Followers: 1)
Revista Fatec Zona Sul : REFAS     Open Access  
Revista Iberoamericana de Automática e Informática Industrial RIAI     Open Access  
Revista Informador Técnico     Open Access   (Followers: 1)
Revista Ingenieria de Construcción     Open Access   (Followers: 1)
Revista Internacional de Métodos Numéricos para Cálculo y Diseño en Ingeniería     Open Access   (Followers: 1)
Revista Logos Ciencia & Tecnología     Open Access   (Followers: 1)
Revue de Métallurgie     Full-text available via subscription  
Russian Engineering Research     Hybrid Journal  
Russian Journal of Non-Ferrous Metals     Hybrid Journal   (Followers: 23)
Russian Microelectronics     Hybrid Journal   (Followers: 1)
Sadhana     Open Access   (Followers: 9)
Safety Science     Hybrid Journal   (Followers: 31)
Scholedge International Journal of Multidisciplinary & Allied Studies     Open Access   (Followers: 3)
Science & Technique     Open Access  
Science and Education : Scientific Publication of BMSTU     Open Access  
Science and Engineering Ethics     Hybrid Journal   (Followers: 9)
Science and Technology     Open Access   (Followers: 2)
Science China Technological Sciences     Hybrid Journal  
Science Journal of Volgograd State University. Technology and innovations     Open Access  
Science Progress     Full-text available via subscription   (Followers: 2)
Scientia cum Industria     Open Access  
Scientific Drilling     Open Access  
Scientific Journal of Control Engineering     Open Access   (Followers: 1)
Scientific Journal of Pure and Applied Sciences     Open Access   (Followers: 1)
Sealing Technology     Full-text available via subscription   (Followers: 1)
Securitas Vialis     Hybrid Journal  
Security and Communication Networks     Hybrid Journal   (Followers: 3)
Selcuk University Journal of Engineering, Science and Technology     Open Access  
Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of     Hybrid Journal   (Followers: 51)
Semiconductors     Hybrid Journal  
Semiconductors and Semimetals     Full-text available via subscription   (Followers: 1)
Sensing and Imaging : An International Journal     Hybrid Journal   (Followers: 2)
Sensor Letters     Full-text available via subscription   (Followers: 2)
Sensors     Open Access   (Followers: 19)
Separation and Purification Technology     Hybrid Journal   (Followers: 10)
Services Computing, IEEE Transactions on     Hybrid Journal   (Followers: 5)
Shock and Vibration     Hybrid Journal   (Followers: 13)
SIAM Journal on Applied Dynamical Systems     Hybrid Journal   (Followers: 2)
SIAM Journal on Mathematical Analysis     Hybrid Journal   (Followers: 3)
SIAM Journal on Matrix Analysis and Applications     Hybrid Journal   (Followers: 1)
SIAM Journal on Numerical Analysis     Hybrid Journal   (Followers: 5)
SIAM Journal on Optimization     Hybrid Journal   (Followers: 8)
SIAM Review     Hybrid Journal   (Followers: 6)
SILICON     Hybrid Journal  
Sistemas & Telemática     Open Access   (Followers: 2)
Sleep and Biological Rhythms     Hybrid Journal   (Followers: 6)
Small     Hybrid Journal   (Followers: 10)
Smart Grid     Open Access  
Soft Computing     Hybrid Journal   (Followers: 8)
Software Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 70)
Soil Dynamics and Earthquake Engineering     Hybrid Journal   (Followers: 15)
Soldagem & Inspeção     Open Access  
Solid-State Circuits Magazine, IEEE     Hybrid Journal   (Followers: 12)
SourceOCDE Developpement urbain, rural et regional     Full-text available via subscription   (Followers: 1)
SourceOCDE Energie     Full-text available via subscription  
SourceOECD Energy     Full-text available via subscription  
SourceOECD Science and Technology Statistics - SourceOCDE Base de donnees des sciences et de la technologie     Full-text available via subscription  
SourceOECD Transport     Full-text available via subscription   (Followers: 3)
SourceOECD Urban, Rural and Regional Development     Full-text available via subscription   (Followers: 1)
South African Computer Journal     Full-text available via subscription  
South African Journal of Agricultural Extension     Open Access   (Followers: 4)
South African Journal of Science     Open Access   (Followers: 3)
Sports Engineering     Hybrid Journal   (Followers: 2)
Stahlbau     Hybrid Journal   (Followers: 3)
Steel in Translation     Hybrid Journal  
Steel Research International     Hybrid Journal   (Followers: 25)
Stochastic Analysis and Applications     Hybrid Journal   (Followers: 2)
Stochastic Processes and their Applications     Hybrid Journal   (Followers: 5)
Stochastics and Dynamics     Hybrid Journal  
Strain     Hybrid Journal   (Followers: 2)
Strategic Planning for Energy and the Environment     Hybrid Journal   (Followers: 4)
Studies in Engineering and Technology     Open Access  
Studies in Interface Science     Full-text available via subscription   (Followers: 1)
Studies in Logic and Practical Reasoning     Full-text available via subscription  
Studies in Surface Science and Catalysis     Full-text available via subscription   (Followers: 1)
Sud-Sciences et Technologies     Open Access  
Superconductor Science and Technology     Hybrid Journal   (Followers: 2)
Surface Engineering     Hybrid Journal   (Followers: 3)
Surface Review and Letters     Hybrid Journal  
Surface Science Reports     Full-text available via subscription   (Followers: 20)
Survey Review     Hybrid Journal   (Followers: 6)
Surveying and Land Information Science     Full-text available via subscription   (Followers: 1)
Sustainability Science     Hybrid Journal   (Followers: 8)
Sustainability Science and Engineering     Full-text available via subscription   (Followers: 4)
Sustainable Management of Sediment Resources     Full-text available via subscription  
Swiss Journal of Geosciences     Hybrid Journal   (Followers: 1)
Symmetry     Open Access  
Synthesis Lectures on Algorithms and Software in Engineering     Full-text available via subscription   (Followers: 3)
Synthesis Lectures on Antennas     Full-text available via subscription   (Followers: 6)
Synthesis Lectures on Biomedical Engineering     Full-text available via subscription  
Synthesis Lectures on Computational Electromagnetics     Full-text available via subscription   (Followers: 5)
Synthesis Lectures on Energy and the Environment: Technology, Science, and Society     Full-text available via subscription   (Followers: 2)
Synthesis Lectures on Engineering     Full-text available via subscription  
Synthesis Lectures on Global Engineering     Full-text available via subscription  
Synthesis Lectures on Professionalism and Career Advancement for Scientists and Engineers     Full-text available via subscription   (Followers: 2)
Synthetic Metals     Hybrid Journal   (Followers: 4)
Systems Engineering     Hybrid Journal   (Followers: 6)
Systems Engineering Procedia     Open Access  
Systems Research Forum     Hybrid Journal  
Systems Science & Control Engineering     Open Access   (Followers: 6)
Technological Engineering     Open Access  
Technologies     Open Access   (Followers: 1)
TECHNOLOGY     Hybrid Journal  
Technology and Innovation     Full-text available via subscription   (Followers: 3)
Technology in Society     Hybrid Journal   (Followers: 4)
Technometrics     Full-text available via subscription   (Followers: 6)
Tecnologia, Ciencia, Educacion     Open Access   (Followers: 1)
Tecnura     Open Access  
Telecommunications Policy     Hybrid Journal   (Followers: 33)
Terahertz Science and Technology, IEEE Transactions on     Hybrid Journal   (Followers: 2)
Textile Science and Technology     Full-text available via subscription   (Followers: 4)
The Journal of Supercomputing     Hybrid Journal   (Followers: 1)
The Scientific World Journal     Open Access  
Theoretical and Computational Fluid Dynamics     Hybrid Journal   (Followers: 15)
Theoretical Issues in Ergonomics Science     Hybrid Journal   (Followers: 5)
Thermal Engineering     Hybrid Journal   (Followers: 8)
Tikrit Journal of Engineering Science     Open Access  
tm - Technisches Messen     Hybrid Journal   (Followers: 3)
Topics in Catalysis     Hybrid Journal   (Followers: 1)
Traffic Injury Prevention     Hybrid Journal   (Followers: 64)
TRANSACTIONS of the VŠB - Technical University of Ostrava, Safety Engineering Series     Open Access   (Followers: 1)
Transactions of Tianjin University     Full-text available via subscription  
Transport and Telecommunication Journal     Open Access   (Followers: 4)
Transport World Africa     Full-text available via subscription   (Followers: 3)
Transportation Research Record : Journal of the Transportation Research Board     Full-text available via subscription   (Followers: 34)
Transportmetrica A : Transport Science     Hybrid Journal   (Followers: 5)
Trends in Applied Sciences Research     Open Access   (Followers: 1)
Tribology in Industry     Open Access   (Followers: 1)
Tribology International     Hybrid Journal   (Followers: 43)
Tribology Letters     Hybrid Journal   (Followers: 5)
Tribology Transactions     Hybrid Journal   (Followers: 33)
Ultramicroscopy     Hybrid Journal   (Followers: 2)
Uludağ University Journal of The Faculty of Engineering     Open Access  
Universal Journal of Applied Science     Open Access   (Followers: 2)
Universal Journal of Engineering Science     Open Access   (Followers: 1)
Utilities Policy     Hybrid Journal   (Followers: 2)
Vacuum     Hybrid Journal   (Followers: 12)
Virtual and Physical Prototyping     Hybrid Journal   (Followers: 3)
Visualization in Engineering     Open Access  
Walailak Journal of Science and Technology     Open Access  
Waste and Biomass Valorization     Hybrid Journal   (Followers: 2)
Waste Management Series     Full-text available via subscription   (Followers: 2)
Waves in Random and Complex Media     Hybrid Journal  
Waves, Wavelets and Fractals     Open Access  
Wear     Hybrid Journal   (Followers: 28)
Welding in the World     Hybrid Journal   (Followers: 6)
West African Journal of Industrial and Academic Research     Open Access   (Followers: 1)
Women in Engineering Magazine, IEEE     Full-text available via subscription   (Followers: 13)

  First | 1 2 3 4 5 6 7 | Last

Journal Cover Ionics
  [SJR: 0.486]   [H-I: 36]   [2 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1862-0760 - ISSN (Online) 0947-7047
   Published by Springer-Verlag Homepage  [2352 journals]
  • Fabrication and electrochemical performance of La 0.5 Sr 0.5 CoO 3
           impregnated porous YSZ cathode
    • Authors: Baijnath; Pankaj Tiwari; Suddhasatwa Basu
      Pages: 2543 - 2551
      Abstract: Abstract La0.5Sr0.5CoO3-yttria-stabilized zirconia (LSCO-YSZ) composite cathode for solid oxide fuel cell (SOFC) has been fabricated by wet impregnation method. Nitrate precursors of La, Sr, and Co have been impregnated into the pre-sintered porous YSZ matrix, which is converted into LSCO phase after calcination at 850 °C in the presence of glycine as confirmed from X-ray diffraction. LSCO of 5, 7, and 10 wt% impregnated porous YSZ have been electrochemically characterized using 2-probe AC conductivity method. Maximum ionic conductivity of 0.27 S/cm at 800 °C and activation energy of 0.15 eV between 600 and 800 °C have been observed for 10 wt% LSCO-YSZ cathode. Area-specific resistance of 1.01 Ω cm2 at 800 °C is estimated for the electrolyte-supported half-cell (10 wt% LSCO-YSZ/YSZ). After testing the LSCO-YSZ cathode matrix, the electrolyte-supported full cell (10 wt% LSCO-YSZ/YSZ/NiO-YSZ) has been tested and produced maximum power density 51.12 mW/cm2 (109.38 mA/cm2) at 800 °C. The electrolyte-supported full cell exhibited 6 Ω cm2 electrode polarization at 800 °C in H2, which is in higher side leading to low performance. LSCO-YSZ/YSZ/NiO-YSZ SOFC found to give stable performance up to 2 h and scanning electron microscopy analysis has been carried out before and after cell testing to assess the morphological changes.
      PubDate: 2017-10-01
      DOI: 10.1007/s11581-017-2001-5
      Issue No: Vol. 23, No. 10 (2017)
       
  • Microstructural interpretation of conductivity and dielectric response of
           Ce 0.9 Eu 0.1 O 1.95 oxygen ion conductors
    • Authors: Sk. Anirban; Abhigyan Dutta
      Pages: 2579 - 2587
      Abstract: Abstract This work focuses on the structure property co-relation study of Eu3+-doped ceria nanomaterials prepared through citrate auto-ignition process and sintered at three different temperatures. The microstructure and dielectric properties were found to be affected by the sintering temperature. The particle size was found to play a major role to the migration of charge carriers in the samples. The dielectric constant has been found to control the formation of dopant-vacancy interaction though columbic interaction in defect pair (Eu′Ce – Vo ••)• and neutral trimers (Eu′Ce – Vo •• – Eu′Ce). The sample sintered at 800 °C shows the lowest value of lattice parameter due to the highest value of dopant-vacancy interaction. The migration energy for oxygen vacancy conduction was found to increase with particle size that reduces the ionic conductivity values. The rate of hopping was found to decrease due to blocking of charge-carrier diffusion due to the growth of particle.
      PubDate: 2017-10-01
      DOI: 10.1007/s11581-017-2066-1
      Issue No: Vol. 23, No. 10 (2017)
       
  • Preparation and characterization of cellulose acetate and lithium nitrate
           for advanced electrochemical devices
    • Authors: S. Monisha; T. Mathavan; S. Selvasekarapandian; A. Milton Franklin Benial; M. Prema latha
      Pages: 2697 - 2706
      Abstract: Abstract Environmental research has the objective of finding solutions to environmental degradation. To this aim, an optimized solid bio-polymer electrolyte (BPE) based on cellulose acetate (CA) with lithium nitrate (LiNO3) has been developed to achieve the possible energy storage Li-ion batteries. CA is one of the natural polymers with very good film forming capacity. The widespread use of CA is attributed to the availability of renewable resources, non-toxic nature, low cost, and bio-compatible material. Here, we demonstrate an extremely simplest process of solution-casting technique for the development of BPE by incorporating various LiNO3 compositions (wt.%) with bio-polymer material CA. The crystalline nature of the CA with LiNO3 has been analyzed by X-ray diffraction (XRD) measurement. The bio-polymer-salt complex formation and the biopolymer-proton interactions have been investigated through Fourier transform infrared (FTIR) spectroscopy. Electrochemical impedance spectroscopy has been used to examine the ionic conductivity of the BPEs at room temperature (303 K). The highest ionic conductivity of 1.93 × 10−3S/cm has been achieved for 50CA/50LiNO3 polymer electrolyte. Electrochemical studies show that highest BPE has high electrochemical stability windows. The conducting species is found to be Li+ ion, which has been confirmed by transference number measurement (TNM). Primary lithium battery with discharge profile has been constructed for 50CA/50LiNO3. This research will help to identify a new lithium ion membrane for battery technology and other electrochemical device applications.
      PubDate: 2017-10-01
      DOI: 10.1007/s11581-016-1886-8
      Issue No: Vol. 23, No. 10 (2017)
       
  • Ab initio study of mechanical strength of solid polymer electrolyte (PEO)
           5 LiClO 4
    • Authors: Mohan L Verma; B. Keshav Rao; Rachna Singh; Durga Banchor; Homendra D Sahu
      Pages: 2715 - 2720
      Abstract: Abstract Mechanical strength is one of the significant properties of any solid polymer electrolyte of electrochemical devices, therefore; the ab initio study based on density functional theory is performed, and the bond strength of Poly ethylene oxide (PEO)5 polymer without and with Lithium Perchlorate (LiClO4) is investigated. The central oxygen atom of PEO is displaced till to respective bond is broken along X, Y, and Z directions, respectively. The same is simulated in the presence of LiClO4 and the minimum bond breaking energy which is also called the mechanical strength is calculated along three directions. Higher energy is required in compression of (PEO)5 along x and y axes than expansion, and vice versa along z axis. The same is observed for (PEO)5-LiClO4 polymer electrolyte along x and y axes, along z direction; the energy required is nearly same for compression/expansion. Due to this energy, crystalline nature of a polymer is reduced and amorphous nature is increased. In DOS analysis, the forbidden energy gap of (PEO)5-LiClO4 is reduced by 1.0 eV than (PEO)5; it causes to increase the lithium cation concentration and the ionic conductivity.
      PubDate: 2017-10-01
      DOI: 10.1007/s11581-017-2025-x
      Issue No: Vol. 23, No. 10 (2017)
       
  • Arrowroot + NaI: a low-cost, fast ion conducting eco-friendly
           polymer electrolyte system
    • Authors: Tuhina Tiwari; Jagdish Kumar Chauhan; Madhavi Yadav; Manindra Kumar; Neelam Srivastava
      Pages: 2809 - 2815
      Abstract: Abstract Energy devices are the lifeline of today’s society, and hence, they are produced in large number resulting in tremendous increase of chemical garbage. Hence, the scientific community is thoroughly looking for eco-friendly alternatives for sustainable development. Polymer electrolytes have received greater attention, and their biodegradable/eco-friendly substitutes are being studied in many laboratories. Starch, being low cost, eco-friendly, and abundant in nature, has attracted many scientists. In our laboratory, crosslinked starches (arrowroot, corn, wheat, and rice) are being used for electrolyte preparation. Present paper discusses the results of arrowroot starch crosslinked with glutaraldehyde and complexed with NaI. The highest conductivity was found to be of the order of 10−2 S/cm. In these systems, conductivity goes on increasing starch/salt ratio up to 1:1 which can be correlated with salt plasticization effect. Phase angle remains above −75° for nearly 3 orders of frequency. The estimated ion relaxation time is 14 μs, and the equivalent series resistance is ∼3 Ω which indicates fast ion response. Cp/Cs ratio remains ∼1 for 4 order of frequency. Such behavior indicates that these materials are suitable for the fast charging-discharging devices.
      PubDate: 2017-10-01
      DOI: 10.1007/s11581-017-2028-7
      Issue No: Vol. 23, No. 10 (2017)
       
  • Polyethylene oxide and ionic liquid-based solid polymer electrolyte for
           rechargeable magnesium batteries
    • Authors: H. N. M. Sarangika; M. A. K. L. Dissanayake; G. K. R. Senadeera; R. R. D. V. Rathnayake; H. M. J. C. Pitawala
      Pages: 2829 - 2835
      Abstract: Abstract Solid polymer electrolytes (SPEs) based on polyethylene oxide (PEO) complexed with magnesium triflate Mg(Tf)2 or Mg(CF3SO3)2) and incorporating the ionic liquid (IL) (1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR14TFSI)) were prepared by solution cast technique. The electrolyte was optimized and characterized using electrical conductivity, cationic transport number measurements, and cyclic voltammetry. The highest conductivity of the PEO/Mg(Tf)2, 15:1 (molar ratio), electrolyte at room temperature was 1.19 × 10−4 S cm−1 and this was increased to 3.66 × 10−4 S cm−1 with the addition of 10 wt.% ionic liquid. A significant increase in the Mg2+ ion transport number was observed with increasing content of the ionic liquid in the PEO-Mg(Tf)2 electrolyte. The maximum Mg2+ ion transport number obtained was 0.40 at the optimized electrolyte composition. A battery of the configuration Mg/ and [(PEO)15:Mg(Tf)2+10%IL]/TiO2-C was assembled and characterized. Preliminary studies showed that the discharge capacity of the battery was 45 mA h g−1.
      PubDate: 2017-10-01
      DOI: 10.1007/s11581-016-1870-3
      Issue No: Vol. 23, No. 10 (2017)
       
  • Polyvinyl pyrrolidone/Mg(ClO 4 ) 2 solid polymer electrolyte: structural
           and electrical studies
    • Authors: R. Mangalam; M. Thamilselvan; S. Selvasekarapandian; S. Jayakumar; R. Manjuladevi
      Pages: 2837 - 2843
      Abstract: Abstract Polymer electrolytes comprising polyvinyl pyrrolidone (PVP) as host polymer and Mg(ClO4)2 as dopant salt have been prepared by solution casting technique using double-distilled water as solvent. The changes in the structural properties on the incorporation of dopant were investigated by XRD and FTIR analysis. The ionic conductivity and dielectric behavior were explored using AC impedance spectroscopy. The ionic conductivity increases with increasing dopant concentration. The conductivity enhancement with the increasing salt concentration is correlated with the increase in amorphous nature of the electrolytes. The frequency dependence of electrical conductivity obeys the universal Jonscher power law. The electrical modulus representation shows a loss feature in the imaginary component. The distribution of relaxation times was indicated by a deformed arc form of the Argand plot. The relative dielectric constant (ε r ) decreases with increase in frequency in the low frequency region whereas a frequency-independent behavior is observed in the high frequency region. The total ionic transference number studies have confirmed that the mobile charge carriers are ions. Results obtained by cyclic voltammetry on SS/60 mol% PVP/40 mol% Mg(ClO4)2 SPE/SS symmetrical cell show evidence for reversibility.
      PubDate: 2017-10-01
      DOI: 10.1007/s11581-016-1931-7
      Issue No: Vol. 23, No. 10 (2017)
       
  • Effect of Na and Mn substitution in perovskite type LaFeO 3 for storage
           device applications
    • Authors: Atma Rai; Awalendra K. Thakur
      Pages: 2863 - 2869
      Abstract: Abstract The feasibility of perovskite-type La0.8Na0.2Fe0.8Mn0.2O3 for structural, electrical, and electrochemical property for high rate capability in supercapacitor has been explored at room temperature. Nanocrystalline La0.8Na0.2Fe0.8Mn0.2O3 was prepared via a modified Pechini route. Structural and surface morphology was done by X-ray diffraction and field emission scanning electron microscopy, respectively. Optical band gap was evaluated to be ∼1.59 eV. The bulk conductivity of the electrode under study was found to be ∼4.54 × 10−7S cm−1. Specific surface area was found to be ∼8.16 m2 g−1. The electrode property has been studied via cyclic voltammetry, electrochemical impedance spectroscopy (EIS), and charge-discharge analysis. The presence of a redox peak in cyclic voltammetry reveals typical pseudocapacitor behavior and recorded in the potential window −0.35 to 1 V. Faradic charge transfer resistance (Rct) was found to be ∼53.85 Ω (Rs = 2.03 Ω) from EIS, and the charge-discharge characteristic for a hundred cycles shows an initial capacity fading up to 25 cycles, beyond which it becomes stable at ∼6.2 Fg−1.
      PubDate: 2017-10-01
      DOI: 10.1007/s11581-017-1990-4
      Issue No: Vol. 23, No. 10 (2017)
       
  • Mixed cation effect and iodide ion conductivity in electrolytes for dye
           sensitized solar cells
    • Authors: M. A. K. Lakshman Dissanayake; G. K. R. Senadeera; T. M. W. J. Bandara
      Pages: 2901 - 2907
      Abstract: Abstract Dye-sensitized solar cells (DSSCs) offer an alternative to conventional silicon solar cell because of low cost and easy fabrication. However, one major drawback in DSSCs is their low efficiency. This paper reports the effect of using a binary iodide salt mixture with different size cations on the efficiency enhancement in dye sensitized solar cells based on polymer gel electrolytes. Several different polymers, such as polyacrylonitrile (PAN), polymethylmethacrylate (PMMA), poly (vinylidenefluoride (PVdF)), and polyethylene oxide (PEO) have been used as host polymers. A binary iodide mixture consisting of an alkaline iodide salt (small cation) and a quaternary ammonium iodide salt such as tetrapropyl ammonium iodide (Pr4NI) (large cation) has been used as the iodide ion source. In some of these systems, efficiency enhancement of more than 25% has been reached due to the “mixed cation effect”. From these studies, it was established that the variation of the power conversion efficiency with the concentration ratio of the two iodide salts follows the same trend as the short circuit current density (J sc) and goes through a maximum at a particular salt concentration ratio. The maximum efficiency was found to be higher than the efficiencies of the DSSCs with only a single iodide salt in the electrolyte. The J sc in these DSSCs appears to be governed by the iodide ion conductivity of the gel electrolyte. The observed efficiency enhancement has been explained on the basis of the electrode effects as well as electrolyte effects where the cations play a dominant role.
      PubDate: 2017-10-01
      DOI: 10.1007/s11581-016-1902-z
      Issue No: Vol. 23, No. 10 (2017)
       
  • Influence of pH in La-doped SnO 2 nanoparticles towards sensor
           applications
    • Authors: S. Jayapandi; P. Packiyaraj; S. Premkumar; J. Mayandi; K. Anitha
      Pages: 2909 - 2917
      Abstract: Abstract The present investigation has been carried out to optimize the pH level of lanthanum (La)-doped tin dioxide (SnO2) nanoparticles towards the potential application in gas sensor. The La-doped SnO2 nanoparticles were synthesized by sol-gel method in different pH values varying from acidic to base nature. The synthesized nanoparticles were characterized by X-ray diffraction (XRD), ultraviolet (UV), photoluminescence (PL), and scanning electron microscopy (SEM) techniques. The XRD, UV, and PL analyses show the pH influences on the crystallite size of La-doped SnO2 nanoparticles. The SEM images show the formation of porous structure at pH 11. Also, the electrical conductivity of 1 mol% La-doped SnO2 at pH 3 and pH 11 were measured by impedance analyzer. In addition, we have fabricated and demonstrated device performance of synthesized La-doped SnO2 nanoparticles for gas-sensing application. Real-time current response and long-time response to the gas sensing were also studied for the fabricated device.
      PubDate: 2017-10-01
      DOI: 10.1007/s11581-017-2121-y
      Issue No: Vol. 23, No. 10 (2017)
       
  • Low temperature microwave sintering of yttrium and samarium co-doped ceria
           solid electrolytes for IT-SOFCs
    • Authors: Kasarapu Venkataramana; K. Ravindranath; Chittimadula Madhuri; Ch Madhusudan; N. Pavan Kumar; C. Vishnuvardhan Reddy
      Abstract: Abstract Nanocrystalline co-doped ceria Ce0.8Sm0.2−xYxO2−δ solid electrolytes for intermediate-temperature solid oxide fuel cells (IT-SOFCs) were synthesized through sol–gel auto-combustion method. The prepared samples were sintered via microwave sintering at 1200 °C for 1 h. The X-ray diffraction analysis of co-doped ceria system reveals formation of the samples with a single-phase cubic fluorite structure. The lattice parameter values were calculated from X-ray diffraction patterns. The calculated crystallite sizes of all the samples were found to be in the range of 17 and 28 nm. Surface morphologies and elemental analysis of all the samples were carried out by using SEM and EDS analysis. The existence of chemical bonding in the samples was studied by FTIR spectroscopy. The presence of oxygen vacancies and evaluation of their concentration in the material was carried out using Raman spectroscopy analysis. Electrical properties of all the samples were analyzed by impedance spectroscopy. It was found that microwave sintered co-doped ceria sample Ce0.8Sm0.1Y0.1O2−δ exhibits the highest total ionic conductivity with minimum activation energy among all the compositions and conventional sintered sample. Therefore, it can be concluded that the microwave sintered Ce0.8Sm0.1Y0.1O2−δ sample may be useful as a promising electrolyte material for the IT-SOFCs.
      PubDate: 2017-10-12
      DOI: 10.1007/s11581-017-2293-5
       
  • Effects of heating rate on morphology and performance of lithium iron
           phosphate synthesized by hydrothermal route in organic-free solution
    • Authors: Changqing Min; Xiuqin Ou; Zhixiang Shi; Guangchuan Liang; Li Wang
      Abstract: Abstract Flake-like LiFePO4 were hydrothermally synthesized in an organic-free solution at heating rates of 0.5, 1.5, 3, and 5 °C min−1. The heating rate has a marked influence on crystal morphology but scarcely on phase purity. The reason for morphology variations is discussed based upon the solubility of precursors Li3PO4 and Fe3(PO4)2·8H2O. The optimum heating rate for hydrothermal synthesis of LiFePO4 is 3 °C min−1. The as-synthesized material exhibits a high specific capacity, excellent rate capability, good low-temperature performance and Li+ diffusivity after carbon coating, all of which could be ascribed to shortened Li+ diffusion distance and higher crystallization degree of the crystalline.
      PubDate: 2017-10-11
      DOI: 10.1007/s11581-017-2287-3
       
  • Fabrication of urchin-like NiCo 2 O 4 microspheres assembled by using SDS
           as soft template for anode materials of Lithium-ion batteries
    • Authors: Yehua Li; Xianwen Wu
      Abstract: Abstract In this paper, the urchin-like NiCo2O4 microspheres assembled by using sodium dodecyl sulfate (SDS) as soft template are successfully fabricated by a facile procedure including microemulsion-solvothermal reaction and subsequent calcination at 400 °C for 4 h. The structure and morphology of synthesized NiCo2O4 particles are investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). It has been clearly revealed that the prepared three-dimensional urchin-like NiCo2O4 microspheres are constituted by one-dimension nanowires. As it is applied to anode for lithium-ion batteries (LIBs), the initial coulombic efficiency is up to 75.7%, and the specific reversible capacity retains up to 1034.2 mAh/g even after 40 cycles at a current density of 100 mA/g. Furthermore, as the current density gradually increases to 800 mA/g, it still delivers the reversible capacity of 895.4 mAh/g. The high reversible specific capacity, perfect cyclability, and rate performance are attributed to the unique urchin-like NiCo2O4 microspheres, which can alleviate the volume expansion and shorten the diffusion path of ions and electrons during lithiation/delithiation process. The self-standing urchin-like NiCo2O4 microspheres may be a very promising candidate in place of the commercial graphite-based anode materials for high-performance LIBs.
      PubDate: 2017-10-08
      DOI: 10.1007/s11581-017-2291-7
       
  • Evaluation of NaFeTiO 4 as an electrode for energy storage application
    • Authors: Biswajit Mandal; Awalendra K. Thakur
      Abstract: Abstract We report a polycrystalline NaFeTiO4 prepared via conventional solid-state reaction route. X-ray diffraction (XRD) results and Rietveld refinement confirmed single-phase NaFeTiO4 having an orthorhombic unit cell with lattice parameters a = 9.17051 Å, b = 2.96310 Å, and c = 10.73676 Å and Pnma space group (No. 62). Energy dispersive spectrum (EDS) yielded sample stoichiometry that agrees well with its molecular formula. The surface morphology indicated a cylindrical rod-like microstructure comprising well-defined grains having variable dimension, i.e., diameter ~ 250 to 350 nm and length ~ 1 to 5 μm. Vibrational spectroscopy (FTIR/Raman) results indicated presence of FeO6 and TiO6 octahedra in good agreement with crystallographic study. Brunner-Emmet-Teller (BET) surface area measurement yielded a specific surface area as high as ~ 4.28 m2 g−1. Electrical impedance spectrum indicated presence of grains separated by well-defined grain boundaries in agreement with microstructural analysis. Electrical conductivity of the material was estimated to be ~ 6.05 × 10−6 S cm−1. The structural model obtained using XRD and vibrational spectrum results suggest layered tunnel/cage structure of cage dimension ~ 4.65 Å, along [010] direction in the xz plane, which is larger than the size of Na+ ion (0.98 Å). So, easier Na+ migration feasibility exists in NaFeTiO4 crystal lattice making it a good candidate for electrode applications.
      PubDate: 2017-10-07
      DOI: 10.1007/s11581-017-2281-9
       
  • Titanium-modified Li 4 Ti 5 O 12 with a synergistic effect of surface
           modifying, bulk doping, and size reducing
    • Authors: Weiwei Meng; Yongjun Xu; Beilei Yan; Jike Guo
      Abstract: Abstract In this work, a one-step solid-phase sintering process via TiO2 and Li2CO3 under an argon atmosphere, with ultra-fine titanium powder as the modifying agent, was used to prepare a nano-sized Li4Ti5O12/Ti composite (denoted as LTO–Ti) at 800 °C. The introduction of ultra-fine metal titanium powder played an important role. First, X-ray photoelectron spectroscopy demonstrates that Ti4+ was partially changed into Ti3+, through the reduction of the ultra-fine metal titanium powder. Second, X-ray diffraction revealed that the ultra-fine metal titanium powder did not react with the bulk structure of Li4Ti5O12, while some pure titanium peaks could be seen. Additionally, the size of LTO–Ti particles could be significantly reduced from micro-scale to nano-scale. The structure and morphology of LTO–Ti were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, scanning electron microscopy, and transmission electron microscopy. Electrochemical tests showed a charge/discharge current of 0.5, 1, 5, and 10 C; the discharge capacity of the LTO–Ti electrode was 170, 161, 140, and 111 mAh g−1. It is believed that the designed LTO–Ti composite makes full use of both components, thus offering a large contact area between the electrolyte and electrode, high electrical conductivity, and lithium-ion diffusion coefficient during electrochemical processes. Furthermore, ultra-fine titanium powder, as the modifying agent, is amenable to large-scale production.
      PubDate: 2017-10-06
      DOI: 10.1007/s11581-017-2278-4
       
  • Supercapacitor electrodes from activation of binderless green monoliths of
           biomass self-adhesive carbon grains composed of varying amount of graphene
           additive
    • Authors: M.R.M. Jasni; M. Deraman; M. Suleman; Z. Zainuddin; M.A.R. Othman; C.H. Chia; M.A. Hashim
      Abstract: Abstract Binderless electrodes of activated carbon monoliths (ACMs) and its composites with graphene are prepared by carbonization and activation of green monoliths consisting of self-adhesive carbon grains and 0–10 wt% KOH-treated graphene. Compared with ACMs, the optimized composite containing 6 wt% graphene exhibits more ordered micro-structures with increased crystallite height, and graphitic sp2 carbons (I D /I G  = 0.49 vs. 0.91) along with enhanced porosity; as revealed by X-ray diffraction, Raman, and N2 adsorption-desorption studies. These modifications lead to increased electrical conductivity (13 vs. 9 S cm−1) through improved interconnections of carbon particles by graphene, and surface area ~ (800 vs. 456 m2 g−1) due to increased inter-particle spacing. Further, contrary to ACMs, the composite electrodes can offer faster delivery of energy in almost 50% less response time (5 vs. 8 s) due to reduced equivalent series resistance (1.67 vs. 2.65 Ω) and charge transfer resistance (0.55 vs. 1.33 Ω).
      PubDate: 2017-10-05
      DOI: 10.1007/s11581-017-2283-7
       
  • One-step synthesis of PEDOT-PSS●TiO 2 by peroxotitanium acid: a highly
           stable electrode for a supercapacitor
    • Authors: G. Ramesh; S. Palaniappan; K. Basavaiah
      Abstract: Pseudo capacitors can reserve high energy and power densities with a high efficiency, and a long life period. In this work, a hybrid material of poly (3,4-ethylenedioxythiophene) (PEDOT)-poly(4-styrene sulfonic acid) (PSS)-titanium dioxide (TiO2) was synthesized by the facile one-pot method by novel and low-cost oxidant peroxotitanium acid (PTiA) for the first time. PTiA acts as both oxidant and source for TiO2. XRD, EDAX, and XPS analysis supported the formation of the hybrid material. The hybrid material showed bundles of nanofibers morphology and stable up to 315 °C. This hybrid material was explored as a stable electrode material in symmetric supercapacitor cell configuration. This device showed a specific capacitance (SC) of 162 F g−1 at a current density of 0.25 A g−1. Subjected the call for 38,000 charge–discharge (CD) cycles at a higher current density of 1.25 A g−1 and it showed 52% retention of initial capacitance (125 F g−1). Graphical abstract ᅟ
      PubDate: 2017-10-04
      DOI: 10.1007/s11581-017-2289-1
       
  • Simultaneous electrochemical determination of isoniazid and ethambutol
           using poly-melamine/electrodeposited gold nanoparticles modified
           pre-anodized glassy carbon electrode
    • Authors: Zahra Sepehri; Hasan Bagheri; Elias Ranjbari; Mohaddeseh Amiri-Aref; Salimeh Amidi; Mohammad Reza Rouini; Yalda Hosseinzadeh Ardakani
      Abstract: Abstract For the first time, simultaneous voltammetric determination of two kinds of the first-line categorized anti-tuberculosis drugs including isoniazid (INZ) and ethambutol (EBL) was reported at a highly sensitive electrochemical sensor. The proposed sensor was successfully prepared based on an electroactive poly-melamine film and electrodeposited gold nanoparticles (PMel-Aunano)-modified pre-anodized glassy carbon electrode (GCE*). The morphological and electrochemical characteristics of the sensing surface (PMel-Aunano/GCE*) was well-characterized by scanning electron microscopy (SEM), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The PMel-Aunano/GCE* exhibited strongly catalytic activity toward the oxidation of INZ (0.39 V potential shift) and EBL (0.29 V potential shift) in comparison with PMel/GCE* and bare GCE. Differential pulse voltammograms of INZ and EBL depicted the linear responses with their concentrations at the ranges of 0.3 to 170.0 μM and 0.5 to 150.0 μM, respectively. The detection limits for INZ and EBL were sequentially estimated as 0.08 and 0.21 μM. Furthermore, the developed electrochemical sensor was successfully implemented for the determination of INZ and EBL in real samples using standard addition method. This fabricated sensor showed to be promising for INZ and EBL detection with many desirable features including high-sensitivity, low detection limit, decrease in over-voltage, reproducible responses, and acceptable anti-interferences ability.
      PubDate: 2017-10-03
      DOI: 10.1007/s11581-017-2263-y
       
  • Single-ion conductivity enhancement for the composite polymer electrolytes
           based on Li(PVAOB)/PPEGMA for lithium-ion batteries
    • Authors: Ali Murat Soydan; Ayhan Bozkurt
      Abstract: Abstract In the present work, a series of single-ion conducting composite polymer electrolytes based on lithium polyvinyl alcohol oxalate borate (Li(PVAOB)) and poly(polyethylene glycol methacrylate) (PPEGMA) were produced. PEGMA was polymerized into PPEGMA, and the Li(PVAOB) was prepared from poly (vinyl alcohol) (PVA), oxalic acid, and boric acid. Li(PVAOB) was blended with PPEGMA at different stoichiometric ratios to obtain a single-ion conducting system. All the electrolytes were characterized by Fourier transformation infrared spectroscopy (FT-IR), thermogravimetry analysis (TGA), differential scanning calorimeter (DSC), and scanning electron microscopy (SEM) techniques. These results verified the interaction between host and guest polymers, sufficient thermal stability within the measured conductivity domain, and the homogeneity of the composite electrolytes. The effect of PPEGMA onto the ionic conductivity was investigated using impedance spectroscopy. The Li(PVAOB)-60PPEGMA is the optimum content, and this sample has a maximum ionic conductivity of 3 × 10−4 S/cm at 100 °C which is approximately five orders of magnitude higher than neat Li(PVAOB). Activation energy (E a ) of ionic transport decreased from 11.9 to 0.27 kJ/mol, suggesting a much faster ionic mobility for higher PPEGMA-containing samples.
      PubDate: 2017-10-02
      DOI: 10.1007/s11581-017-2286-4
       
 
 
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