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  Subjects -> ENGINEERING (Total: 2255 journals)
    - CHEMICAL ENGINEERING (187 journals)
    - CIVIL ENGINEERING (178 journals)
    - ELECTRICAL ENGINEERING (99 journals)
    - ENGINEERING (1203 journals)
    - ENGINEERING MECHANICS AND MATERIALS (383 journals)
    - HYDRAULIC ENGINEERING (55 journals)
    - INDUSTRIAL ENGINEERING (60 journals)
    - MECHANICAL ENGINEERING (90 journals)

ENGINEERING (1203 journals)            First | 1 2 3 4 5 6 7 | Last

Showing 1001 - 1200 of 1205 Journals sorted alphabetically
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: 231)
Propulsion and Power Research     Open Access   (Followers: 15)
Purinergic Signalling     Hybrid Journal   (Followers: 1)
Quaderns d’Història de l’Enginyeria     Open Access  
Quality and Reliability Engineering International     Hybrid Journal   (Followers: 11)
Quality Engineering     Hybrid Journal   (Followers: 8)
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: 2)
Recherche Transports Sécurité     Hybrid Journal   (Followers: 1)
Redes de Ingeniería     Open Access  
Regional Maritime University Journal     Full-text available via subscription   (Followers: 1)
Regular and Chaotic Dynamics     Hybrid Journal  
Rem : Revista Escola de Minas     Open Access   (Followers: 1)
Remote Sensing     Open Access   (Followers: 17)
Remote Sensing Letters     Hybrid Journal   (Followers: 19)
Requirements Engineering     Hybrid Journal   (Followers: 3)
Research Ideas and Outcomes     Open Access  
Research in Engineering Design     Hybrid Journal   (Followers: 10)
Research Journal of Nanoscience and Nanotechnology     Open Access   (Followers: 2)
Research Works of Air Force Institute of Technology     Open Access   (Followers: 1)
Resonance     Hybrid Journal   (Followers: 22)
Review of Symbolic Logic     Full-text available via subscription   (Followers: 1)
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 Científica e-Locução     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 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  
Revue de Métallurgie     Full-text available via subscription  
Russian Engineering Research     Hybrid Journal  
Russian Journal of Non-Ferrous Metals     Hybrid Journal   (Followers: 25)
Russian Microelectronics     Hybrid Journal   (Followers: 1)
Sadhana     Open Access   (Followers: 6)
Safety Science     Hybrid Journal   (Followers: 17)
Scholedge International Journal of Multidisciplinary & Allied Studies     Open Access   (Followers: 2)
Science & Technique     Open Access  
Science and Engineering Ethics     Hybrid Journal   (Followers: 6)
Science and Technology     Open Access   (Followers: 2)
Science China Technological Sciences     Hybrid Journal  
Science in Context     Hybrid Journal   (Followers: 1)
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 Journal of Control Engineering     Open Access   (Followers: 1)
Scientific Journal of Pure and Applied Sciences     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: 2)
Selcuk University Journal of Engineering, Science and Technology     Open Access   (Followers: 1)
Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of     Hybrid Journal   (Followers: 21)
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: 1)
Sensors     Open Access   (Followers: 12)
Separation and Purification Technology     Hybrid Journal   (Followers: 10)
Services Computing, IEEE Transactions on     Hybrid Journal   (Followers: 4)
Shock and Vibration     Hybrid Journal   (Followers: 6)
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: 6)
SIAM Review     Hybrid Journal   (Followers: 5)
SILICON     Hybrid Journal  
Sistemas & Telemática     Open Access   (Followers: 1)
Sleep and Biological Rhythms     Hybrid Journal   (Followers: 4)
Small     Hybrid Journal   (Followers: 9)
Smart Grid     Open Access  
Soft Computing     Hybrid Journal   (Followers: 6)
Software Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 33)
Soil Dynamics and Earthquake Engineering     Hybrid Journal   (Followers: 10)
Soldagem & Inspeção     Open Access  
Solid-State Circuits Magazine, IEEE     Hybrid Journal   (Followers: 8)
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: 3)
South African Journal of Science     Open Access   (Followers: 3)
Sports Engineering     Hybrid Journal   (Followers: 2)
Stahlbau     Hybrid Journal   (Followers: 4)
Steel in Translation     Hybrid Journal  
Steel Research International     Hybrid Journal   (Followers: 27)
Stochastic Analysis and Applications     Hybrid Journal  
Stochastic Processes and their Applications     Hybrid Journal   (Followers: 4)
Stochastics and Dynamics     Hybrid Journal  
Strain     Hybrid Journal   (Followers: 1)
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: 1)
Surface Engineering     Hybrid Journal   (Followers: 3)
Surface Review and Letters     Hybrid Journal   (Followers: 1)
Surface Science Reports     Full-text available via subscription   (Followers: 14)
Survey Review     Hybrid Journal   (Followers: 6)
Surveying and Land Information Science     Full-text available via subscription   (Followers: 2)
Sustainability Science     Hybrid Journal   (Followers: 5)
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: 3)
Synthesis Lectures on Biomedical Engineering     Full-text available via subscription  
Synthesis Lectures on Computational Electromagnetics     Full-text available via subscription   (Followers: 3)
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  
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: 3)
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: 11)
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 Computational Multiphase Flows     Full-text available via subscription  
The Journal of Supercomputing     Hybrid Journal   (Followers: 1)
The Scientific World Journal     Open Access  
Theoretical and Computational Fluid Dynamics     Hybrid Journal   (Followers: 10)
Theoretical Issues in Ergonomics Science     Hybrid Journal   (Followers: 2)
Thermal Engineering     Hybrid Journal   (Followers: 4)
Tikrit Journal of Engineering Science     Open Access  
tm - Technisches Messen     Hybrid Journal   (Followers: 1)
Topics in Catalysis     Hybrid Journal   (Followers: 1)
Traffic Injury Prevention     Hybrid Journal   (Followers: 48)
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: 3)
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: 33)
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  
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: 29)
Welding in the World     Hybrid Journal   (Followers: 2)
West African Journal of Industrial and Academic Research     Open Access   (Followers: 1)
Women in Engineering Magazine, IEEE     Full-text available via subscription   (Followers: 9)
World Journal of Engineering     Full-text available via subscription   (Followers: 3)
World Journal of Engineering and Technology     Open Access  
World Journal of Environmental Engineering     Open Access   (Followers: 2)
World Pumps     Full-text available via subscription   (Followers: 2)
World Science and Technology     Full-text available via subscription   (Followers: 1)

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Journal Cover Ionics
  [SJR: 0.497]   [H-I: 27]   [0 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]
  • Construction of polyaniline/molybdenum sulfide nanocomposite:
           characterization and its electrocatalytic performance on nitrite
    • Abstract: Abstract A polyaniline/molybdenum sulfide (PANI-MoS2) nanocomposite was synthesized via a hydrothermal method and in situ polymerization, respectively. Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) results indicated that the PANI and MoS2 had been successfully composited. Cyclic voltammetry (CV) result showed that the PANI-0.1 g MoS2-modified glassy carbon electrode (GCE) exhibited excellent electrochemical activity in a 0.1 M phosphate-buffered saline (PBS) solution compared to the MoS2, PANI, and other PANI-MoS2 composite-modified GCEs. CV result also confirmed that nitrite could be oxidized by the PANI-0.1 g MoS2 in a pH 5.0 PBS solution. The amperometric response result indicated that the PANI-0.1 g MoS2-modified GCE could be used to determine a nitrite concentration in a wide linear range of 4.0 and 4834 μM with a detection limit of 1.5 μM. The anti-interference property and real sample analysis was also proposed.
      PubDate: 2016-07-01
       
  • Ionic conductivity and dielectric properties of potato starch-magnesium
           acetate biopolymer electrolytes: the effect of glycerol and
           1-butyl-3-methylimidazolium chloride
    • Abstract: Abstract In the present work, the effect of glycerol and 1-butyl-3-methylimidazolium chloride (BmImCl) on the conductivity and dielectric properties of potato starch doped with magnesium acetate, Mg(C2H3O2)2-based electrolytes is studied. The electrolytes are prepared via solution cast technique. The interaction between the materials is proven by Fourier transform infrared (FTIR) analysis. Electrolyte with 20 wt.% Mg(C2H3O2)2 exhibits a room temperature conductivity of (2.44 ± 0.37) × 10−8 S cm−1. The addition of 30 wt.% glycerol to the best polymer-salt composition has further enhanced the conductivity to (2.60 ± 0.42) × 10−6 S cm−1. A conductivity of (1.12 ± 0.08) × 10−5 S cm−1 has been achieved when 18 wt.% BmImCl is added to the best polymer-salt-plasticizer composition. From the loss tangent (tan δ) plot, the relaxation time (t r) for selected electrolytes is determined. From transference number measurements, ions are found to be the dominant charge carriers.
      PubDate: 2016-07-01
       
  • Glycerol oxidation reaction using PdAu/C electrocatalysts
    • Abstract: Abstract Glycerol oxidation reactions were evaluated using PdAu/C electrocatalysts under alkaline conditions. These electrocatalysts were synthesized in different ratios (100:0, 75:25, 50:50, 25:75, and 0:100), using the borohydride reduction method. The materials were characterized with X-ray diffraction (XRD), transmission electron microscopy (TEM), and electrochemical techniques associated by in situ attenuated total reflectance Fourier transformed infrared spectroscopy (ATR-FTIR). According to the XRD diffractograms, the presence of Pd and Au (face-centered cubic (fcc)) phases and Pd-Au (fcc) alloys were detected. Cyclic voltammetry assisted by ATR-FTIR in situ and chronoamperometry experiments revealed that the addition of Au remarkably enhances the electrocatalytic activity, due to the action of bifunctional effect, with addition of the interactions of alcohoxide with hydroxylate species in gold surface, and the stability of Pd/C catalysts. Highest current density (≈4 mA mgmetal −1) was achieved for the catalyst Pd50Au50/C and Pd75Au25/C, which is two times higher than that achieved by Pd/C (2 mA mgmetal −1), demonstrating the beneficial effect of the PdAu alloy.
      PubDate: 2016-07-01
       
  • Electrochemical and structural properties of a polymer electrolyte system
           based on the effect of CeO 2 nanofiller with PVDF-co-HFP for energy
           storage devices
    • Abstract: Abstract In the present work, a series of five different nanocomposite polymer electrolytes (NCPEs) have been reported with varying contents of ceria, CeO2 nanofiller suitably incorporated within an optimized composition having 75:25 wt% ratio of poly(vinylidenefluoride-co-hexafluoropropylene) [(PVDF-co-HFP)] and zinc trifluoromethanesulfonate (ZnTf) in the form of films obtained by mean of solution casting technique with a general formula [75 wt% PVDF-co-HFP:25 wt% ZnTf]-x wt% CeO2 where x = 1, 3, 5, 7, and 10, respectively. The chosen NCPE system is found to exhibit the maximum electrical conductivity of 3 × 10−4 S cm−1 for 5 wt% loading of CeO2 nanofiller at ambient temperature. The observed conductivity enhancement has been attributed to the occurrence of an increase in the amorphous content as confirmed by X-ray diffraction (XRD) analysis. Detailed Fourier transform infrared (FTIR) spectral analysis has indicated the feasibility of complexation of the host polymer matrix with ZnTf salt and CeO2 nanofiller. The incorporation of CeO2 nanofiller has further increased the decomposition voltage of the polymer electrolyte from 2.4 to 2.7 V as revealed from the voltammetric studies performed on such NCPEs, thereby suggesting the suitability of these NCPE films with an enhanced electrical conductivity as new electrolytes in order to design and fabricate eco-friendly zinc rechargeable batteries and other electrochemical devices.
      PubDate: 2016-07-01
       
  • Supercapacitor performances of rich nitrogen-doped mesoporous graphene
           fabricated by a facile template-free copyrolysis process
    • Abstract: Abstract Rich nitrogen-doped mesoporous graphene (NDMG) with a large specific surface area of 496.8 m2 g−1 and high electrical conductivity of 327.2 S cm−1, and suitable pore size was synthesized by a facile co-thermal annealing of pre-prepared phenolic polymer and dicyandiamide. The NDMG has a high nitrogen content (7.9 wt%) and can act as promising electroactive materials for two-electrode symmetric supercapacitors. The NDMG cells displayed a high specific capacitance of ca. 316 F g−1 at 0.5 A g−1, which is much higher than that of the pristine graphene devices (ca. 123 F g−1). Moreover, compared with the capacitance drop rate of pristine graphene devices (8.9 %), the specific capacitance of NDMG cells was decreased by only 3.2 % after 2000 cycles, exhibiting a good cycling performance and reversibility. In addition, the specific capacitance of the NDMG cells can reach 251 F g−1 at 5.0 A g−1, revealing an excellent rate capability and implying the ability to deliver a high energy density at a high power density. The good electrochemical performances of NDMG can be attributed to its high surface area, suitable mesopore size, and high electrical conductivity.
      PubDate: 2016-07-01
       
  • The comparative theoretical study of the La B O 3 (001) ( B
            = Mn, Fe, Co, and Ni) surface properties and oxygen adsorption
           mechanisms
    • Abstract: Abstract In this paper, the surface properties of the (001) surface LaBO3 (B = Mn, Fe, Co, and Ni) perovskites and oxygen adsorption mechanism are investigated using first-principles calculations based on density functional theory (DFT) and pseudopotential method. Surface rumpling and Mulliken effective atomic charges have been obtained. The surface rumpling displays a big wave and increases following the sequence Fe < Co < Mn < Ni at the BO2-terminated surface. The calculated effective charges show that the excess electronic charges at the LaO-terminated surface transfer to the inner atom of the surface. We also report a comparative study of oxygen molecular adsorption properties at BO2- and LaO-terminated surfaces of LaBO3 (001). The optimized geometries of the adsorbed oxygen species, adsorption energies, bond lengths, bond populations, and effective charges have been analyzed. The results show the oxygen molecule adsorption at the hollow site of the LaO-terminated surface has much higher adsorption energy and dissociation probability than that at other sites. Oxygen species has a strong tendency for getting adsorbed at the site and thereby filling it. The comparative study of the LaBO3 (001) surface properties and oxygen adsorption mechanism may guide us to search for high-efficiency cathode materials for solid oxide fuel cells (SOFC).
      PubDate: 2016-07-01
       
  • Crystal structure analysis of Li 3 PO 4 powder prepared by wet chemical
           reaction and solid-state reaction by using X-ray diffraction (XRD)
    • Abstract: Abstract Lithium phosphate (Li3PO4) is one of the promising solid electrolyte materials for lithium-ion battery because of its high ionic conductivity. A crystalline form of Li3PO4 had been prepared by two different methods. The first method was wet chemical reaction between LiOH and H3PO4, and the second method was solid-state reaction between Li2O and P2O5. Crystal structure of Li3PO4 white powder had been investigated by using an X-ray diffraction (XRD) analysis. The results show that Li3PO4 prepared by wet chemical reaction belongs to orthorhombic unit cell of β-Li3PO4 with space group Pmn21. Meanwhile, Li3PO4 powder prepared by solid-state reaction belongs to orthorhombic unit cell of γ-Li3PO4 with space group Pmnb and another unknown phase of Li4P2O7. The impurity of Li4P2O7 was due to phase transformation in solid state reaction during quenching of molten mixture from high temperature. Ionic conductivity of Li3PO4 prepared by solid-state reaction was ∼3.10−7 S/cm, which was higher than Li3PO4 prepared by wet chemical reaction ∼4.10−8 S/cm. This increasing ionic conductivity may due to mixed crystal structures that increased Li-ion mobility in Li3PO4.
      PubDate: 2016-07-01
       
  • Preparation and electrochemical properties of LiFePO 4 /graphene
           composites from tailoring graphene oxides
    • Abstract: Abstract LiFePO4/graphene composites have been prepared by using tailoring graphene oxide (GO) nanosheets as precursors. The structure and electrochemical properties of the composites were investigated by X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), Raman microscopy, and a variety of electrochemical testing techniques. The decrease in graphene size reduces the contact resistance between activated materials, and enhances the lithium-ion transport in LiFePO4/graphene composites. With low weight fractions of small-size graphene sheets, the composites show better electrochemical performance than those with large size graphene sheets.
      PubDate: 2016-07-01
       
  • TiO 2 modified carbon paste sensor for voltammetric analysis and
           
    • Abstract: Abstract A new square wave adsorptive stripping voltammetric (SWAdSV) approach using experimental design and optimization methodology was developed for the quantitative estimation of amlodipine (AMP) in pharmaceutical tablets. To this end, a new carbon paste electrode (CPE) system was fabricated using titanium dioxide (TiO2) nanoparticles to get very well-defined oxidation peak current of AMP under the optimized conditions. Optimal electrochemical conditions for three factor variables, the pH, the accumulation potential, and the accumulation time, were obtained by applying a 33 full factorial design and optimization technique to the oxidation of AMP on the TiO2 modified CPE (TiO2-CPE) system. The numerical values of the optimal voltammetric parameters consisting of the pH, accumulation potential, and accumulation time were found to be 5.69, 562.30 mV, and 64.30 s for the analysis of AMP in samples, respectively. The newly developed voltammetric method for the determination of AMP offers a linear relationship between the peak current and concentration in the range of 1.0 × 10−8 − 1.0 × 10−6 M with the correlation coefficient (r = 0.9990) and the detection limit (LOD = 2.97 × 10−9 M). The lifetime of prepared electrode was also tested, and the current intensity of AMP was nearly stable at least 2 months by using TiO2-CPE. The validity of the method was tested by analyzing standard samples containing the analyzed compound. Under optimized and validated experimental conditions, the proposed method was successfully applied for the quantitative analysis of AMP in commercial tablets.
      PubDate: 2016-07-01
       
  • Growth of FePO 4 nanoparticles on graphene oxide sheets for synthesis of
           LiFePO 4 /graphene
    • Abstract: Abstract FePO4·xH2O/graphene oxide (FePO4·xH2O/GO) composites were prepared by a facile chemical precipitation method. Using the as-prepared FePO4·xH2O/GO and LiOH·H2O as precursors and followed by carbothermal reduction, LiFePO4/graphene composites were obtained. Scanning electron microscope (SEM) images indicated that the graphene had very good dispersity and uniformly attached to the LiFePO4 particles. The conductive framework of graphene improved the electrochemical properties of the composites. The composites deliver high initial discharge capacity of 163.4 mAh g−1 as well as outstanding rate performance.
      PubDate: 2016-07-01
       
  • Electrochemical comparison of LiFe 0.4 Mn 0.595 Cr 0.005 PO 4 /C and
           LiMnPO 4 /C cathode materials
    • Abstract: Abstract A comparison of electrochemical performance between LiFe0.4Mn0.595Cr0.005PO4/C and LiMnPO4/C cathode materials was conducted in this paper. The cathode samples were synthesized by a nano-milling-assisted solid-state process using caramel as carbon sources. The prepared samples were investigated by XRD, SEM, TEM, energy-dispersive X-ray spectroscopy (EDAX), powder conductivity test (PCT), carbon-sulfur analysis, electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge cycling. The results showed that LiFe0.4Mn0.595Cr0.005PO4/C exhibited high specific capacity and high energy density. The initial discharge capacity of LiFe0.4Mn0.595Cr0.005PO4/C was 163.6 mAh g−1 at 0.1C (1C = 160 mA g−1), compared to 112.3 mAh g−1 for LiMnPO4/C. Moreover, the Fe/Cr-substituted sample showed good cycle stability and rate performance. The capacity retention of LiFe0.4Mn0.595Cr0.005PO4/C was 98.84 % over 100 charge-discharge cycles, while it was only 86.64 % for the pristine LiMnPO4/C. These results indicated that Fe/Cr substitution enhanced the electronic conductivity for the prepared sample and facilitated the Li+ diffusion in the structure. Furthermore, LiFe0.4Mn0.595Cr0.005PO4/C composite presented high energy density (606 Wh kg−1) and high power density (574 W kg−1), thus suggested great potential application in lithium ion batteries (LIBs).
      PubDate: 2016-07-01
       
  • Fabrication and characterization of Ni-SSZ/SSZ/LSM-SSZ anode-supported
           SOFCs by tape casting and single-step co-sintering techniques
    • Abstract: Abstract In this work, Ni-10 % Sc2O3-stabilized ZrO2 (SSZ)/SSZ/La0.8Sr0.2MnO3-δ (LSM)-SSZ anode-supported solid oxide fuel cells (SOFCs) have been successfully prepared by tape casting and single-step co-sintering procedures. The structure contains Ni-SSZ anode substrate and Ni-SSZ anode functional, dense SSZ electrolyte, LSM-SSZ cathode functional, and LSM-SSZ cathode layers were successfully prepared at 1250, 1300, and 1350 °C, respectively. The microstructures of the single cells were examined by SEM. There were some close pores in electrolyte of Cell-1250, and the cathode particle size obviously increased in Cell-1350. Therefore, Cell-1300 showed the optimal cell performance, the maximum power density attained 920 mW cm−2 at 800 °C. The impedance analysis demonstrated that the co-sintered temperatures have effects on not only the polarization resistance R P of a single cell but also its overall ohmic resistance R S . The results indicate that the tape casting and single-step co-sintering methods are both time saving and feasible for the development of anode-supported SOFCs.
      PubDate: 2016-07-01
       
  • Sintering and electrical conductivity of gadolinia-doped ceria
    • Abstract: Abstract Bulk specimens of Ce0.9Gd0.1O2-δ prepared with powders within a range of specific surface area were sintered in oxidizing, inert, and reducing atmospheres. The aim of this work is to investigate the effects of the sintering atmosphere on the microstructure and grain and grain boundary conductivities of the solid electrolyte. The lattice parameter determined by Rietveld refinement is 0.5420(1) nm, and the microstrain was found negligible in the powder materials. Specimens sintered in the Ar/4 % H2 mixture display larger average grain sizes independent on the particle size of the starting powders. The grain and grain boundary conductivities of specimens sintered under reducing atmosphere are remarkably lower than those sintered under oxidizing and inert atmospheres. The activation energy (∼0.90 eV) for total electrical conductivity remains unchanged with both the initial particle size and the sintering atmosphere.
      PubDate: 2016-07-01
       
  • Hierarchically structured nitrogen-doped carbon for advanced
           supercapacitor electrode materials
    • Abstract: Abstract A facile and scalable method is used in this study for oxidation polymerization and catalytic carbonization method to prepare three-dimensional hierarchically structured nitrogen-doped carbon nanohybrids (3D N-CNs) which could be used as the efficient electrode material for supercapacitors. In the synthesis process, citric acid plays an important role in controlling the shape of nitrogen-doped carbon nanohybrids. As an electrode material for supercapacitors, the 3D N-CNs-2 possess high specific capacitance of 274.6 F g−1 at 0.5 A g−1, excellent rate capability (ca.75.5 % retention along with the current density increasing from 0.5 to 20 A g−1) in 6 M KOH aqueous solution. The electrochemical performance can be ascribed to the synergistic effects of the hierarchical nanostructure and nitrogen doping, suggesting that the 3D N-CNs-2 as novel electrode materials may have the potential applications in high-performance energy storage devices.
      PubDate: 2016-07-01
       
  • AC conductivity and dielectric behavior of low-temperature phase of
           α-AgCuPO 4
    • Abstract: Abstract The copper monophosphate compound, α-AgCuPO4, was prepared by the conventional solid-state reaction. The purity of the compound was checked by X-ray diffraction technique (XRD). Detailed dielectric and electrical properties of the compound were analyzed as a function of frequency (209 Hz–1 MHz) and temperature (343–514 K). The AC conductivity has been fitted and studied using Jonscher’s equation, whose exponent n varied with the temperature, showing that the overlapping large polaron tunneling model (OLPT) is the appropriate model to describe the electrical conduction mechanism.
      PubDate: 2016-07-01
       
  • Thermal properties and ionic conductivity of Li 1,3 Ti 1,7 Al 0,3 (PO 4 )
           3 solid electrolytes sintered by field-assisted sintering
    • Abstract: Abstract Li1,3Ti0,7Al0,3(PO4)3 (LATP) powder was obtained by a conventional melt-quenching method and consolidated by field-assisted sintering technology (FAST) at different temperatures. Using this technique, the samples could be sintered to relative densities in the range of 93 to 99 % depending on the sintering conditions. Ionic and thermal conductivity were measured and the results are discussed under consideration of XRD and SEM analyses. Thermal conductivity values of 2 W/mK and ionic conductivities of 4 × 10−4 Scm−1 at room temperature were obtained using relatively large particles and a sintering temperature of 1000 °C at an applied uniaxial pressure of 50 MPa.
      PubDate: 2016-07-01
       
  • Synthesis and elevated temperature performance of a
           polypyrrole-sulfur-multi-walled carbon nanotube composite cathode for
           lithium sulfur batteries
    • Abstract: Abstract A sulfur-multi-walled carbon nanotube composite (S/MWCNT) was prepared using a two-step procedure of liquid-phase infiltration and melt diffusion. Polypyrrole (PPy) conductive polymer was coated on the surface of the as-prepared S/MWCNT composite by in situ polymerization of pyrrole monomer to obtain PPy/S/MWCNT composite. The composite materials were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). The electrochemical performance of the as-prepared cathode material was investigated at 25, 40, and 70 °C at various rates. It was found that temperature has dual effects on the performance of Li/S cells. Increasing the temperature, on one hand, facilitates the lithium ion transport through the cathode and, on the other hand, leads to faster dissolution of active material into the electrolyte. The PPy coating can effectively trap polysulfides in its porous structure, even at elevated temperatures, leading to the improvement of the discharge capacity, the cycle stability, and the coulombic efficiency. The electrochemical impedance spectroscopy (EIS) results reveal that the PPy coating reduces the formation of passive layer on the cathode surface, even at high temperatures, resulting in a better elevated temperature performance. A high reversible capacity of 945 mAh g−1 was maintained after 50 cycles for the PPy/S/MWCNT composite at 70 °C at a rate of 0.5 C.
      PubDate: 2016-07-01
       
  • Polyethylene-supported poly(methyl methacrylate -co- butyl acrylate)-based
           novel gel polymer electrolyte for lithium ion battery
    • Abstract: Abstract A new copolymer, poly(methyl methacrylate-co-butyl acrylate) (P(MMA-co-BA)), was synthesized by emulsion polymerization with different mass ratio of methyl methacrylate (MMA) and butyl acrylate (BA). The membranes were prepared by phase inversion and corresponding gel polymer electrolytes (GPEs) were obtained by immersing the membrane into a liquid electrolyte. In this design, the hard monomer MMA provided the copolymer with good electrolyte uptake, while the soft monomer BA provided the GPE with strong adhesion between the anode and cathode of lithium ion battery. The properties of the resulting product were investigated by Fourier transform infrared spectroscopy, nuclear magnetic resonance spectra, scanning electron spectroscopy, linear sweep voltammetry, thermogravimetric analysis, cyclic voltammetry, electrochemical impedance spectroscopy and charge/discharge test. The results show that the obtained GPE based on P(MMA-co-BA) with the mass ratios of MMA and BA = 6:1 exhibits good conductivity (as high as 1.2 × 10−3 S cm−1) at room temperature and high electrochemical stability (up to 4.9 V vs. Li/Li+). With the application of the polyethylene (PE)-supported GPE in Li/Li(Li0.13Ni0.30Mn0.57)O2 battery, the battery presents good cyclic stability (maintaining 95.4 % of its initial discharge capacity after 50 cycles) at room temperature.
      PubDate: 2016-07-01
       
  • Enhanced performance of dye-sensitized solar cell using
           2-mercaptobenzothiazole-doped
           poly(vinylidinefluoride-co-hexafluoropropylene) polymer electrolyte
    • Abstract: Abstract The effect of 2-mercaptobenzothiazole (2-MCBT) on the performance of poly(vinylidinefluoride-co-hexafluoropropylene)/KI/I2 (PVDF-HFP/KI/I2) electrolyte in dye-sensitized solar cell (DSSC) was studied. The pure and 2-MCBT-doped PVDF-HFP/KI/I2 electrolytes were prepared by solution casting technique using N,N-dimethyl formamide (DMF) as a solvent. The characteristic properties of the as-prepared polymer electrolyte films were examined using various techniques such as Fourier transform infrared (FTIR) spectroscopy, X-ray diffractometer (XRD), AC-impedance analysis, and scanning electron microscopy (SEM) analysis. The ionic conductivity of polymer electrolytes was determined using AC-impedance analysis. The room temperature ionic conductivity of pure and 2-MCBT-doped PVDF-HFP/KI/I2 electrolytes were found to be 7.08 × 10−6 and 5.96 × 10−5 Scm−1, respectively. The increase in ionic conductivity of 2-MCBT-doped electrolyte may be due to the increase of both amorphous nature and iodide ion mobility of the polymer electrolyte. The photovoltaic studies, using pure and 2-MCBT-doped PVDF-HFP/KI/I2 electrolyte in DSSC showed an increase of power conversion efficiency from 1.74 to 3.46 % under the light intensity of 60 mW/cm2. Thus, the 2-MCBT-doped polymer electrolyte has been found to be a suitable material for DSSC applications.
      PubDate: 2016-07-01
       
  • Effect of casting condition on the porosity of polymer membrane and its
           
    • Abstract: Abstract The present study demonstrates the effect of casting conditions (relative humidity and temperature) on morphology of poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) membranes prepared from solution of the co-polymer in tetrahydrofuran (solvent) and water (non-solvent and pore former). Membranes with thicknesses of 4–6 μm have been obtained by doctor blade casting under different conditions. High-temperature cast membranes yield less porous membranes. Low-temperature casting results in a maximum of 52 % (surface) porosity of membranes. High relative humidity (80 %) during casting results in bigger pore size in membrane than low relative humidity. Membranes containing liquid electrolyte have been subjected to testing in dye-sensitized solar cells as quasi-solid electrolytes. A maximum photo-conversion efficiency of 2.5 % for 1 cm2 active area has been achieved in membrane-based cells as compared to 2.8 % for cells having liquid electrolyte. High-temperature cast membranes result in poor performance due to hindrance in the charge transport.
      PubDate: 2016-07-01
       
 
 
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