for Journals by Title or ISSN
for Articles by Keywords
help
  Subjects -> ENGINEERING (Total: 2278 journals)
    - CHEMICAL ENGINEERING (190 journals)
    - CIVIL ENGINEERING (182 journals)
    - ELECTRICAL ENGINEERING (102 journals)
    - ENGINEERING (1206 journals)
    - ENGINEERING MECHANICS AND MATERIALS (390 journals)
    - HYDRAULIC ENGINEERING (55 journals)
    - INDUSTRIAL ENGINEERING (64 journals)
    - MECHANICAL ENGINEERING (89 journals)

ENGINEERING (1206 journals)            First | 1 2 3 4 5 6 7 | Last

Showing 1001 - 1200 of 1205 Journals sorted alphabetically
Production and Operations Management     Hybrid Journal   (Followers: 10)
Production Engineering     Hybrid Journal   (Followers: 5)
Production Planning & Control: The Management of Operations     Hybrid Journal   (Followers: 7)
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: 32)
Propellants, Explosives, Pyrotechnics     Hybrid Journal   (Followers: 269)
Propulsion and Power Research     Open Access   (Followers: 24)
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: 3)
Rare Metals     Hybrid Journal  
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  
Rem : Revista Escola de Minas     Open Access   (Followers: 1)
Remote Sensing     Open Access   (Followers: 37)
Remote Sensing Letters     Hybrid Journal   (Followers: 36)
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: 26)
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  
Revista Cubana de Ingeniería     Open Access  
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  
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  
Revista Internacional de Métodos Numéricos para Cálculo y Diseño en Ingeniería     Open Access  
Revista Logos Ciencia & Tecnología     Open Access  
Revista Petra     Open Access  
Revue de Métallurgie     Full-text available via subscription  
Russian Engineering Research     Hybrid Journal  
Russian Journal of Non-Ferrous Metals     Hybrid Journal   (Followers: 22)
Russian Microelectronics     Hybrid Journal   (Followers: 1)
Sadhana     Open Access   (Followers: 7)
Safety Science     Hybrid Journal   (Followers: 25)
Scholedge International Journal of Multidisciplinary & Allied Studies     Open Access   (Followers: 2)
Science & Technique     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: 3)
Scientia cum Industria     Open Access  
Scientific Drilling     Open Access  
Scientific Journal of Control Engineering     Open Access   (Followers: 1)
Scientific Journal of Review     Open Access  
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: 47)
Semiconductors     Hybrid Journal  
Semiconductors and Semimetals     Full-text available via subscription  
Sensing and Imaging : An International Journal     Hybrid Journal   (Followers: 1)
Sensor Letters     Full-text available via subscription   (Followers: 2)
Sensors     Open Access   (Followers: 14)
Separation and Purification Technology     Hybrid Journal   (Followers: 10)
Services Computing, IEEE Transactions on     Hybrid Journal   (Followers: 5)
Shock and Vibration     Hybrid Journal   (Followers: 9)
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: 4)
SIAM Journal on Optimization     Hybrid Journal   (Followers: 8)
SIAM Review     Hybrid Journal   (Followers: 6)
SILICON     Hybrid Journal  
Sistemas & Telemática     Open Access   (Followers: 1)
Sleep and Biological Rhythms     Hybrid Journal   (Followers: 6)
Small     Hybrid Journal   (Followers: 11)
Smart Grid     Open Access  
Soft Computing     Hybrid Journal   (Followers: 8)
Software Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 55)
Soil Dynamics and Earthquake Engineering     Hybrid Journal   (Followers: 14)
Soldagem & Inspeção     Open Access  
Solid-State Circuits Magazine, IEEE     Hybrid Journal   (Followers: 9)
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: 3)
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)
Superconductor Science and Technology     Hybrid Journal   (Followers: 2)
Surface Engineering     Hybrid Journal   (Followers: 4)
Surface Review and Letters     Hybrid Journal   (Followers: 1)
Surface Science Reports     Full-text available via subscription   (Followers: 15)
Survey Review     Hybrid Journal   (Followers: 6)
Surveying and Land Information Science     Full-text available via subscription   (Followers: 2)
Sustainability Science     Hybrid Journal   (Followers: 7)
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  
Symmetry     Open Access  
Synthesis Lectures on Algorithms and Software in Engineering     Full-text available via subscription  
Synthesis Lectures on Antennas     Full-text available via subscription   (Followers: 5)
Synthesis Lectures on Biomedical Engineering     Full-text available via subscription  
Synthesis Lectures on Computational Electromagnetics     Full-text available via subscription   (Followers: 4)
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: 1)
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: 5)
Techno.Com     Open Access  
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: 27)
Terahertz Science and Technology, IEEE Transactions on     Hybrid Journal   (Followers: 2)
Textile Science and Technology     Full-text available via subscription   (Followers: 3)
The Journal of Supercomputing     Hybrid Journal   (Followers: 1)
The Scientific World Journal     Open Access  
Theoretical and Computational Fluid Dynamics     Hybrid Journal   (Followers: 12)
Theoretical Issues in Ergonomics Science     Hybrid Journal   (Followers: 3)
Thermal Engineering     Hybrid Journal   (Followers: 7)
Tikrit Journal of Engineering Science     Open Access  
tm - Technisches Messen     Hybrid Journal   (Followers: 2)
Topics in Catalysis     Hybrid Journal   (Followers: 1)
Traffic Injury Prevention     Hybrid Journal   (Followers: 63)
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: 41)
Tribology Letters     Hybrid Journal   (Followers: 5)
Tribology Transactions     Hybrid Journal   (Followers: 33)
Tribotest     Hybrid Journal  
Tropical Science     Hybrid Journal   (Followers: 1)
Turkish Journal of Engineering and Environmental Sciences     Open Access   (Followers: 1)
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: 1)
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: 3)
West African Journal of Industrial and Academic Research     Open Access   (Followers: 1)
Women in Engineering Magazine, IEEE     Full-text available via subscription   (Followers: 11)
World Journal of Engineering     Full-text available via subscription   (Followers: 3)

  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  [2335 journals]
  • Effect of Ce-doped MnO 2 catalyst on the lithium-air batteryperformance in
           the ambient atmosphere
    • Authors: Kun He; Yongming Zhu; Haihao Shi
      Pages: 385 - 393
      Abstract: Abstract MnO2 doped with Ce was hydrothermally synthesized and the as-made breathable waterproof membrane used outside the cathode was prepared for improving the lithium-air battery performance in air. The samples were characterized by scanning electron microscopy (SEM), energy dispersive spectrum analysis (EDS), charge–discharge cycle tests, charge–discharge cycle tests of limited capacity, and electrochemical impedance spectroscopy (EIS) tests. The result showed that Ce x Mn1-x O2 can effectively reduce the charge overpotential of the cathode. The charge and discharge electrical potential difference of Ce0.1Mn0.9O2 was only 700 mV while MnO2’s was 2100 mV. And Ce0.1Mn0.9O2 that exhibited high discharge capacity of 400 mAh g−1 in air had a stable discharge platform of 2.5 V and then the more obvious charge phenomenon appeared after 3.5 V. The excellent catalysis, the effect of cathode catalytic materials named Ce x Mn1-x O2, may attribute to the decrease of reaction potential energy of oxygen reduction reaction and oxygen evolution reaction.
      PubDate: 2017-02-01
      DOI: 10.1007/s11581-016-1832-9
      Issue No: Vol. 23, No. 2 (2017)
       
  • Comparative study of the properties of TiO 2 nanoflower and TiO 2 -ZnO
           composite nanoflower and their application in dye-sensitized solar cells
    • Authors: S. A. M. Samsuri; M. Y. A. Rahman; A. A. Umar
      Abstract: Abstract We report the comparative study of TiO2 nanoflower (NF) and TiO2-ZnO composite NF in terms of properties and dye-sensitized solar cell performances. TiO2 NF has been constructed by using the simple liquid phase deposition (LPD) method while TiO2-ZnO composite NF was prepared by using dip-coating method in which the as-prepared TiO2 NF was immersed into ZnO growth solution. The power conversion efficiency of the DSSC utilizingTiO2-ZnO composite NF is higher (0.62 ± 0.02%) compared to TiO2 NF (0.17 ± 0.10%) due to higher photon absorption, dye loading, R cr, and longer electron life time than those of TiO2 NF.
      PubDate: 2017-02-19
      DOI: 10.1007/s11581-017-2010-4
       
  • Vibrational, electrical, and ion transport properties of PVA-LiClO 4
           -sulfolane electrolyte with high cationic conductivity
    • Authors: S. Abarna; G. Hirankumar
      Abstract: Abstract Novel solid polymer electrolytes, poly(vinylalcohol)-lithium perchlorate (PVA-LiClO4) and PVA-LiClO4-sulfolane are prepared by solvent casting method. The experimental results show that sulfolane addition enhances the ionic conductivity of PVA-LiClO4 complex by three orders. The maximum ionic conductivity of 1.14 ± 0.20 × 10−2 S cm−1 is achieved for 10 mol% sulfolane-added electrolyte at ambient temperature. Polymer-salt-plasticizer interactions are analyzed through attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy. Lithium ion transference number is found by AC impedance spectroscopy combined with DC potentiostatic measurements. The results confirm that sulfolane improves the Li+ transference number of PVA-LiClO4 complex to 0.77 from 0.40. The electrochemical stability window of electrolytes is determined by cyclic voltammetry (CV). The broad electrochemical stability window of 5.45 V vs. lithium is obtained for maximum conducting electrolyte. All-solid-state cell is fabricated using maximum conducting electrolyte, and electrochemical impedance study is carried out. It reveals that electrolyte interfacial resistance with Li electrode is very low. The use of PVA-LiClO4-sulfolane as a viable electrolyte material for high-voltage lithium ion batteries is ensured.
      PubDate: 2017-02-17
      DOI: 10.1007/s11581-017-2008-y
       
  • Aspects of proton transport in calix[6]arene sulfonic acid
    • Authors: Lyubov Shmygleva; Evgeny Sanginov; Nikita Slesarenko; Aleksander Chernyak; Aleksander Karelin; Yury Dobrovolsky
      Abstract: Abstract The features of proton transport and proton hydration shell structure of calix[6]arene sulfonic acid were studied. XRD and NMR data indicate the existence of crystalline and amorphous phases and various conformations in the acid structure. The hydration process occurs in three stages by thermal analysis and IR spectroscopy. The change in the composition of the hydrate affected the conductivity only at low humidity; an inverse relationship between the water uptake and the activation energy of conductivity is observed in the entire investigated range of humidity.
      PubDate: 2017-02-16
      DOI: 10.1007/s11581-017-2011-3
       
  • Impact of insoluble starch remnants on the behavior of corn
           starch/glycerol/LiCl solid electrolyte
    • Authors: C. Roldan-Cruz; A. Garcia-Hernandez; E. J. Vernon-Carter; J. Alvarez-Ramirez
      Abstract: Abstract The effect of starch-insoluble remnants (i.e., ghosts) on the behavior of the solid biopolymer electrolyte remains to be studied. This work focused on this issue by considering a case-study system formed by corn starch, glycerol, and lithium chloride. The ghost content was controlled by subjecting the gelatinized dispersion to ultrasonic cavitation at various times. Ghost content reduction led to a slight decrease in conductivity. When the ghost content was reduced to almost nil, the capacitance estimated from cyclic voltammetry tests showed a decrease of about 37%. In contrast, the stability of the electrolyte, estimated by repeated potential cycles, was positively affected. Formation of free radicals and starch chain retrogradation are postulated as the mechanisms involved in the conductivity and capacitance variations in corn starch, glycerol, and lithium chloride solid biopolymer electrolyte.
      PubDate: 2017-02-16
      DOI: 10.1007/s11581-017-2014-0
       
  • Structural and electrochemical investigation on Ga 3+ doped Pr 1.3 Sr 0.7
           Ni 0.7 Cu 0.3 O 4 + δ cathodes for IT-SOFC applications
    • Authors: M. Bansod; A. P. Khandale; S. S. Bhoga
      Abstract: Abstract The Pr1.3Sr0.7Ni(0.7 − x)Ga x Cu0.3O4 + δ (x = 0.0, 0.02, 0.05, and 0.1) oxides with tetragonal K2NiF4-type crystal structure with I/4mmm symmetry are obtained by sintering sol–gel-derived stoichiometric powders at 1000 °C for 6 h. X-ray powder diffraction, transmission electron microscopy, and infrared spectroscopy studies confirm the formation of single-phase solid solutions. The Ga3+ co-doping decreases dc electrical conductivity due to reduction in mobile charge carrier concentration. The symmetrical cells with the configurations Pr1.3Sr0.7Ni0.7 − x Ga x Cu0.3O4 + δ /GDC/Pr1.3Sr0.7Ni0.7 − x Ga x Cu0.3O4 + δ prepared by screen printing are characterized using scanning electron microscopy and complex impedance spectroscopy. The lowest electrode polarization resistance (R p = 0.202(3) Ω cm2 at 700 °C) and minimum activation energy (E a = 1.325(4) eV) observed at x = 0.05 are attributed to an increase in bulk oxygen ion diffusion. The non-charge transfer adsorption/desorption of oxygen on the cathode (O2 , abs ⇔ 2Oabs) and O2− diffusion are coexisting major steps of the oxygen reduction reaction (ORR).
      PubDate: 2017-02-15
      DOI: 10.1007/s11581-017-1998-9
       
  • A study of electrochemical behavior of quinazolin derivatives as novel
           additives and their specific effects on the performance of dye-sensitized
           solar cells
    • Authors: Mohammad Mazloum-Ardakani; Rezvan Arazi; Fatemeh Tamaddon; Mohammad Taghi Kazemi
      Abstract: As a new kind of additives, quinazolin derivatives were synthesized in oxidation and reduction forms. The influence of these electrolyte additives on the short-circuit photocurrent (J sc) and open-circuit voltage (V oc) of dye-sensitized solar cells was investigated by electrochemical and impedance techniques. After addition of quinazolin derivatives to an electrolyte, cyclic voltammetry revealed a decrease in the rate of dye regeneration whereas electrochemical impedance spectra showed an increment in the charge transfer resistance due to the formation of a complex between the electrolyte additives and iodine, as characterized by an absorption peak around 350 nm in the UV–vis spectra. It resulted in a decrease in J sc of the dye-sensitized solar cells from 17.4 to 15 mA cm−2. This adverse effect on J sc can be attributed to the reaction or the coordination between the dye cations and the iodine in the electrolyte. In spite of the decrease in the short-circuit photocurrent, the open-circuit voltage and the conversation efficiency (η) increased significantly. The V oc and η were enhanced for 25 and 17.11%, respectively, in comparison with the standard electrolyte. Graphical abstract Schematic illustration of the electron flow in an operating DSC
      PubDate: 2017-02-11
      DOI: 10.1007/s11581-017-1980-6
       
  • Poly-acrylonitrile-based gel-polymer electrolytes for sodium-ion batteries
    • Authors: K. Vignarooban; P. Badami; M. A. K. L. Dissanayake; P. Ravirajan; A. M. Kannan
      Abstract: Abstract Research and development activities on sodium-ion batteries are becoming prominent in the past few years. Compared to lithium-based batteries, the sodium-based batteries will be cheaper because of the abundancy of sodium raw materials in the earth’s crust and also in seawater. In the current study, we synthesized and characterized poly-acrylonitrile (PAN)-based gel-polymer electrolytes formed with NaClO4 and dissolved in ethylene carbonate (EC) and propylene carbonate (PC). By systematically varying the weight ratios of polymer, salt, and the solvents, we obtained an optimum room temperature ionic conductivity of 4.5 mS cm−1 for the composition 11PAN-12NaClO4-40EC-37PC (wt.%), which is reasonably good for practical applications. This value of conductivity is comparable to a few other Na+ ion conducting gel-polymer electrolyte systems studied in the recent past. Variation of ionic conductivity with inverse temperature showed Arrhenius behavior. Activation energies estimated for all the samples showed only a slight variation suggesting that a single activation process which depends on the EC/PC co-solvent governs the ionic mobility in these gel-polymer electrolytes. Thermo-gravimetric analysis (TGA) revealed that there is no noticeable weight loss of these electrolytes up to 100 °C and hence the electrolytes are thermally stable for operating temperatures up to 100 °C.
      PubDate: 2017-02-11
      DOI: 10.1007/s11581-017-2002-4
       
  • Detection of catechin in Chinese green teas at N-doped carbon-modified
           electrode
    • Authors: Jian Pang; Xiujuan Wu; Anna Li; Xiaowang Liu; Maoguo Li
      Abstract: Abstract Herein, we present a simple and facile synthesis strategy of porous N-doped graphene (N-Gr) using a facile one-step pyrolysis method. The as-prepared N-Gr was characterized by power X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. N-Gr-modified glassy carbon electrode exhibited a lower overpotential and the higher redox peak currents for catechin during the electrochemical reaction of catechin. At the N-Gr-modified electrode, the redox process of catechin was almost reversible and displayed an adsorption-controlled redox process with a fast electron transfer rate. The linear responses of the sensor for catechin have been obtained by the differential pulse voltammetry in the range from 1.0 to 30 μM with the calculated detection limit of 0.088 μM (S/N = 3). The real application of catechin in Chinese green tea samples with excellent performance such as long-term stability and good reproducibility was successfully achieved.
      PubDate: 2017-02-10
      DOI: 10.1007/s11581-017-2006-0
       
  • Electrochemical properties of LiMn 2 O 4 prepared with tartaric acid
           chelating agent
    • Authors: A. K. Arof; M. Z. Kufian; N. Aziz; N. A. Mat Nor; K. H. Arifin
      Abstract: Abstract Lithium manganese oxide (LiMn2O4) has been prepared using sol-gel technique under acidic (pH = 5.8) and alkaline (pH = 9) conditions with tartaric acid as chelating agent. X-ray studies show that under acidic condition, an Mn2O3 peak was observed indicating the presence of impurities. No impurity was observed for LiMn2O4 under alkaline conditions. The particle size is mostly in the range of 124 to 185 nm from HR-TEM. The lithium diffusion coefficient, D Li+ in LiMn2O4 is of the order 10−9 cm2 s−1. By using density functional theory (DFT) calculations, structural properties have been obtained. The specific discharge capacity of the cells with LiMn2O4 prepared under alkaline condition and with LiMn2O4 prepared under acidic condition discharged at 0.5 C is in the ranges of 132 to 142 and 128 to 139 mAh g−1, respectively.
      PubDate: 2017-02-10
      DOI: 10.1007/s11581-017-1997-x
       
  • A facile synthesis about amorphous CoS 2 combined with first principle
           analysis for supercapacitor materials
    • Authors: Shang-Yu Zhai; Lei-Lei Li; Men-Gang Wang
      Abstract: Abstract The structure and electrochemical properties of amorphous CoS2 and crystalline CoS2 have been studied with both experimental characterization and theoretical calculations. In the field of experimental characterization, a facile chemical precipitation method is used to synthesize amorphous and crystalline CoS2 samples with calcining temperatures of 200 and 280 °C, respectively. Comparing with crystalline CoS2, amorphous structure of CoS2 manifests great electron conductivity, effective porous structure, and exhibit a high specific capacitance of 996.16 F g−1 at current density of 0.5 A g−1, excellent rate capability of 89.8% retention with the current density ranging from 0.5 to 5 A g−1, and a great cycling stability of 97.6% retention after 10,000 cycles at 2 A g−1 in 6 mol L−1 KOH aqueous electrolyte. In the area of theoretical calculation, we used the first principle and obtained the band structure with band gap of 0.00369 eV and DOSs with high locality of D-orbital from 69.88689 electrons/eV main peak, in the CoS2 amorphous. The result confirms that amorphous CoS2 have higher conductivity than crystalline CoS2 in theory. In addition, the as-assembled asymmetric supercapacitor of Co-S-200//AC also exhibits the maximum specific capacitance of 104 F g−1 within a cell voltage from 0 to 1.5 V at current density of 0.5 A g−1 and indicates a great cycling stability of 95.68% and excellent capacitance behavior. All results demonstrate a great potential of amorphous CoS2 active material for supercapacitors.
      PubDate: 2017-02-09
      DOI: 10.1007/s11581-017-1991-3
       
  • Fabrication and electrochemical performance of La 0.5 Sr 0.5 CoO 3
           impregnated porous YSZ cathode
    • Authors: Baijnath; Pankaj Tiwari; Suddhasatwa Basu
      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: 2017-02-08
      DOI: 10.1007/s11581-017-2001-5
       
  • Research progress on the low-temperature electrochemical performance of Li
           4 Ti 5 O 12 anode material
    • Authors: Qian Huang; Zhen Yang; Jian Mao
      Abstract: Abstract Li4Ti5O12 is regarded as the ideal anode material for its stable structure, high charge/discharge platform, and safety performance. But low ionic and electronic conductivity of the Li4Ti5O12 anode material under the condition of low temperature greatly limit its application in practical production. In this paper, some modified methods for improving the low-temperature electrochemical performance of Li4Ti5O12 anode material were summarized. Meanwhile, we explored its influence mechanisms at low temperature, one is, with the subtle changes of lattice parameters and oxygen atom fraction coordinates of Li4Ti5O12 at low temperature, the changes of the bond length influence the structural stability of Li4Ti5O12 and the diffusion path of lithium ions; the other reason is that the charge transfer resistance increases obviously and the lithium ion diffusion coefficient reduces under low temperature. Finally, the research directions for improving the low-temperature electrochemical performance were proposed.
      PubDate: 2017-02-07
      DOI: 10.1007/s11581-017-2004-2
       
  • Synthesis and electrochemical characterization of graphene nanoflakes and
           LiFe 0.97 Ni 0.03 PO 4 /C for lithium-ion battery
    • Authors: Rakesh Saroha; Amrish K. Panwar; Akmal R. Farooq; Lucky Krishniya; P. K. Tyagi
      Abstract: Abstract The graphene nanoflakes and olivine-type LiFe0.97Ni0.03PO4/C (LFNP3/C) samples have been synthesized as anode and cathode materials, respectively. Physicochemical characterization of the graphene nanoflakes and LFNP3/C material were studied using X-ray diffraction (XRD) and scanning electron microscope (SEM). The XRD patterns reveal the formation of the pure phase of both the synthesized samples. SEM micrographs disclose the formation of spherically shaped nanosized particles for LFNP3/C while graphene shows flake-type morphology. CR2032 half and full coin cells were assembled for electrochemical testing of the synthesized samples. Cyclic voltammetry (CV) results indicate that the graphene-based half-cells, i.e., GN1H and GN2H, possess reduction peak/plateau around 0.17 V while LFNP3/C cathode shows discharging voltage plateau at 3.4 V vs. Li/Li+. The discharge capacities were found to be 700, 900, and 153 mAhg−1 for GN1H, GN2H, and LFNP3/C half-cells vs. Li/Li+, respectively. Among full cells, LFPGN1F with γ = 0.75 (mass/capacity balancing factor) shows better charging/discharging profile at each C-rate as compared to LFPGN2F with γ = 0.55. LFPGN1F delivered an initial discharge capacity of around 154 mAhg−1 at 0.1C and even at a high discharge rate of 1C, it retained ~97% of the discharge capacity as compared to the initial cycle at the same rate.
      PubDate: 2017-02-06
      DOI: 10.1007/s11581-017-2000-6
       
  • Electrocatalytic conversion of carbon dioxide to urea on nano-FeTiO 3
           surface
    • Authors: Palanisamy Siva; Periasamy Prabu; Mohanraj Selvam; Subramani Karthik; Venkatachalam Rajendran
      Abstract: Abstract The effect of the electrochemical reduction of carbon dioxide (CO2) on the structure and morphology of two different synthesised nano FeTiO3 composite was examined after a fixed-potential bulk electrolysis process. FeTiO3 was used as the cathode, stainless steel (SS) plate as anode and CO2 saturated NaHCO3 and KNO2 as electrolysis. At optimized condition, CO2 is effectively reduced to urea. Fourier transform infrared spectroscopy (FTIR) used to examine the two different synthesis of nano FeTiO3 surfaces to reveal the carbonate ions and urea species during reduction. Ultraviolet–visible spectroscopy (UV) peaks explain the urea function groups present in electrolyte after the CO2 and NO2 reduction. Charge transfer resistance is using Electrochemical Impedance Spectroscopy (EIS) analysis. A systematic Cyclic Voltammetry (CV) and Linear Sweep Voltammetry (LSV), two different synthesis of FeTiO3 composite, were performed in order to decouple electrochemical reduction processes of CO2 and NO2 to urea in aqueous solutions.
      PubDate: 2017-02-04
      DOI: 10.1007/s11581-017-1985-1
       
  • Dependence of photovoltaic parameters on the size of cations adsorbed by
           TiO 2 photoanode in dye-sensitized solar cells
    • Authors: J.M.K.W. Kumari; G.K.R. Senadeera; M.A.K.L. Dissanayake; C.A. Thotawatthage
      Abstract: Abstract The effects of “pre-adsorbed cations” in photoanodes on the performances of dye-sensitized solar cells (DSSCs) were studied using two different size cations (K+ and guanidine cation (G+)). While the DSSCs with optimized K+ ions pre-adsorbed photoanodes showed a maximum efficiency of 7.04%, the DSSCs with G+ ions pre-adsorbed photoanodes showed an efficiency of 6.73%. DSSCs fabricated with conventional photanodes (without pre-cation adsorption) showed an efficiency of 6.21%. Differences in efficiencies are very likely due to the cation pre-adsorption effects and could be due to a higher number of K+ cation adsorption per unit area of TiO2 surface of the photoanode compared to a smaller number of G+ cation adsorption in TiO2, due to their difference in sizes. This pre-cation adsorption technique can be used to improve the overall efficiency of a DSSC by about 14% fold over the conventional photoanodes use in DSSCs, specially using smaller cations.
      PubDate: 2017-02-04
      DOI: 10.1007/s11581-017-1995-z
       
  • Progressive addition of GO to TiO 2 nanowires for remarkable changes in
           photochemical hydrogen production
    • Authors: K. Manjunath; L. S. Reddy Yadav; G. Nagaraju; J. Dupont; T. Ramakrishnappa
      Abstract: Abstract Addition of 2D GO to the TiO2 nanowires brings about progressive changes in the optical properties and photochemical hydrogen production. The composition with progressive addition of GO played a dramatic role in making the material blue shift. The blue shift may happen due to transition from O2− anti-bonding orbital to the Ti4+ lowest empty orbital and also the process of band shifting towards lower wavelength is attributed to quantum confinement effect which occurs due to the transformation of bulk titanate to nanostructure titanate. In this article, we present the results of TiO2 nanowires and its rGO composites. TiO2 with 30 mg rGO nanocomposite exhibits good UV-light induced hydrogen production unlike bare TiO2. Current studies explain how rGO addition can be employed for better hydrogen production.
      PubDate: 2017-02-04
      DOI: 10.1007/s11581-017-1977-1
       
  • Polyvinyl butyral-based gel polymer electrolyte films for solid-state
           laminated electrochromic devices
    • Authors: Fan Zhang; Guobo Dong; Jiang Liu; Shubing Ye; Xungang Diao
      Abstract: Abstract Polyvinyl butyral-based gel polymer electrolyte films (PVB-based GPEFs) were prepared by casting method. The surface morphology and ionic conductivity of the PVB-based GPEFs were measured; cyclic voltammetry behavior, optical properties, and coloration efficiency of the devices were investigated. The SEM shows amorphous polymer matrix with interval and micropores among the molecule chains. With different volume of ionic liquid, the ionic conductivity of electrolyte films increased up to 4.0 × 10−-5 and 6.2 × 10−5 S/cm at 25 and 50 °C, respectively. Electrochromic devices (ECDs) with glass/ITO/WO3/PVB-based GPEF/Ni1-xO/ITO/glass configuration were prepared following the technology of laminated safety glass. The best device provided excellent electrochromic performances with high optical modulation of 65.8% at 550 nm, coloration efficiency of 175.34 cm2/C, and long-term stability. In addition, small color fading of 4.8% was observed under self-discharging conditions for 16 h, proving that the PVB-based ECD possesses sufficient memory effect as smart window.
      PubDate: 2017-02-04
      DOI: 10.1007/s11581-017-1996-y
       
  • A biopolymer-based voltammetric sensor for thymine: Elucidation of
           electrochemical kinetics
    • Authors: S. Jesny; Zafna Rasheed; K. Girish Kumar
      Abstract: In the work accounted here, the electro-oxidation of one of the pyrimidine bases thymine is studied on a glassy carbon electrode modified with the biopolymer, poly (l-glutamic acid), as the probe. On the probe, the overpotential for thymine oxidation in alkaline medium has been significantly decreased attesting the electrocatalytic nature of the biopolymer film. The experimental parameters to obtain the lowest oxidation potential have been optimised and the probe calibrated for the determination of thymine. In the square wave mode, using 0.1 M NaOH as the supporting electrolyte, the oxidation peak current was found to be linear in the range from 30 to 1000 μM, with a detection limit of 9.2 μM. The diffusion coefficient of thymine in 0.1 M sodium hydroxide has been determined using chronoamperometric studies. To study the mechanistic aspects of the electro-oxidation process, variation of the oxidation peak parameters with scan rate has been studied in the linear sweep mode. Electrochemical kinetic parameters, namely charge transfer coefficient α and the standard heterogeneous rate constant k s for the electro-oxidation, have also been determined. The determination of thymine in spiked synthetic blood serum and urine has been conducted to demonstrate the application of the sensor for thymine determination in real samples. Graphical abstract Electrocatalytic oxidation of thymine on the biopolymer [poly(glutamic acid)]-modified glassy carbon electrode.
      PubDate: 2017-02-02
      DOI: 10.1007/s11581-016-1958-9
       
  • Synthesis, thermal and electrical behavior of the superprotonic conductor
           phase in Rb 3 (HSeO 4 ) 2.5 (H 2 PO 4 ) 0.5 compound
    • Authors: N. Nouiri; K. Jaouadi; N. Zouari; T. Mhiri
      Abstract: Abstract The Rb3(HSeO4)2.5(H2PO4)0.5 compound was prepared and its thermal behavior and electric properties were investigated. The thermogravimetry (TGA) analysis and the differential scanning calorimetric (DSC) show the presence of a structural phase transition of the title compounds at 374 K which is confirmed by the variation of fp and σdc as a function of temperature. The complex impedance of the Rb3(HSeO4)2.5(H2PO4)0.5 compound has been investigated in the temperature range of 295–453 K and in the frequency range 209 Hz–1 MHz. The impedance plots show semicircle arcs at different temperatures, and an electrical equivalent circuit has been proposed to explain the impedance results. The circuits consist of the parallel combination of bulk resistance Rp and constant phase elements CPE1 in series with fractal capacity CPE2. The frequency dependence of the conductivity is interpreted in terms of Jonscher’s law. The conductivity dc follows the Arrhenius relation. The near value of activation energies obtained from the analysis of modulus, conductivity data, and circuit equivalent confirm that the transport is through the ion hopping mechanism, dominated by the motion of the H+ proton in the structure of the investigated materials.
      PubDate: 2017-02-02
      DOI: 10.1007/s11581-017-1970-8
       
 
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
Fax: +00 44 (0)131 4513327
 
Home (Search)
Subjects A-Z
Publishers A-Z
Customise
APIs
Your IP address: 174.129.66.66
 
About JournalTOCs
API
Help
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-2016