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ENGINEERING (1110 journals)            First | 2 3 4 5 6 7 8 9 | Last

International Journal of Mathematical Education in Science and Technology     Hybrid Journal   (Followers: 6)
International Journal of Mathematics in Operational Research     Hybrid Journal   (Followers: 1)
International Journal of Medical Engineering and Informatics     Hybrid Journal   (Followers: 5)
International Journal of Micro Air Vehicles     Full-text available via subscription   (Followers: 3)
International Journal of Microwave and Wireless Technologies     Hybrid Journal   (Followers: 1)
International Journal of Microwave Science and Technology     Open Access   (Followers: 2)
International Journal of Mobile Network Design and Innovation     Hybrid Journal   (Followers: 3)
International Journal of Multiphase Flow     Hybrid Journal   (Followers: 2)
International Journal of Nanomanufacturing     Hybrid Journal   (Followers: 1)
International Journal of Nanoscience     Hybrid Journal   (Followers: 1)
International Journal of Nanotechnology     Hybrid Journal   (Followers: 5)
International Journal of Navigation and Observation     Open Access   (Followers: 5)
International Journal of Network Management     Hybrid Journal  
International Journal of Nonlinear Sciences and Numerical Simulation     Full-text available via subscription   (Followers: 1)
International Journal of Numerical Methods for Heat & Fluid Flow     Hybrid Journal   (Followers: 7)
International Journal of Optics     Open Access   (Followers: 1)
International Journal of Organisational Design and Engineering     Hybrid Journal   (Followers: 8)
International Journal of Pattern Recognition and Artificial Intelligence     Hybrid Journal   (Followers: 6)
International Journal of Pavement Engineering     Hybrid Journal   (Followers: 2)
International Journal of Physical Modelling in Geotechnics     Hybrid Journal   (Followers: 3)
International Journal of Plasticity     Hybrid Journal   (Followers: 6)
International Journal of Plastics Technology     Hybrid Journal  
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 3)
International Journal of Polymer Science     Open Access   (Followers: 16)
International Journal of Precision Engineering and Manufacturing     Hybrid Journal   (Followers: 6)
International Journal of Precision Technology     Hybrid Journal  
International Journal of Pressure Vessels and Piping     Hybrid Journal   (Followers: 2)
International Journal of Production Economics     Hybrid Journal   (Followers: 10)
International Journal of Quality and Innovation     Hybrid Journal   (Followers: 2)
International Journal of Quality Engineering and Technology     Hybrid Journal   (Followers: 2)
International Journal of Quantum Information     Hybrid Journal  
International Journal of Rapid Manufacturing     Hybrid Journal   (Followers: 2)
International Journal of Reliability, Quality and Safety Engineering     Hybrid Journal   (Followers: 4)
International Journal of Renewable Energy Technology     Hybrid Journal   (Followers: 7)
International Journal of Robust and Nonlinear Control     Hybrid Journal   (Followers: 2)
International Journal of Science Engineering and Advance Technology     Open Access  
International Journal of Sediment Research     Full-text available via subscription   (Followers: 1)
International Journal of Self-Propagating High-Temperature Synthesis     Hybrid Journal   (Followers: 2)
International Journal of Signal and Imaging Systems Engineering     Hybrid Journal  
International Journal of Six Sigma and Competitive Advantage     Hybrid Journal  
International Journal of Social Robotics     Hybrid Journal   (Followers: 1)
International Journal of Software Engineering and Knowledge Engineering     Hybrid Journal   (Followers: 1)
International Journal of Space Science and Engineering     Hybrid Journal   (Followers: 2)
International Journal of Speech Technology     Hybrid Journal   (Followers: 3)
International Journal of Spray and Combustion Dynamics     Full-text available via subscription   (Followers: 5)
International Journal of Surface Engineering and Interdisciplinary Materials Science     Full-text available via subscription   (Followers: 1)
International Journal of Surface Science and Engineering     Hybrid Journal   (Followers: 7)
International Journal of Sustainable Engineering     Hybrid Journal   (Followers: 7)
International Journal of Sustainable Manufacturing     Hybrid Journal   (Followers: 4)
International Journal of Systems Assurance Engineering and Management     Hybrid Journal  
International Journal of Systems, Control and Communications     Hybrid Journal   (Followers: 2)
International Journal of Technology Management and Sustainable Development     Hybrid Journal   (Followers: 1)
International Journal of Technology Policy and Law     Hybrid Journal   (Followers: 4)
International Journal of Telemedicine and Applications     Open Access   (Followers: 2)
International Journal of Thermal Sciences     Hybrid Journal   (Followers: 4)
International Journal of Thermodynamics     Open Access   (Followers: 1)
International Journal of Turbo & Jet-Engines     Full-text available via subscription  
International Journal of Ultra Wideband Communications and Systems     Hybrid Journal  
International Journal of Vehicle Autonomous Systems     Hybrid Journal   (Followers: 1)
International Journal of Vehicle Design     Hybrid Journal   (Followers: 6)
International Journal of Vehicle Information and Communication Systems     Hybrid Journal   (Followers: 2)
International Journal of Vehicle Noise and Vibration     Hybrid Journal   (Followers: 3)
International Journal of Vehicle Safety     Hybrid Journal   (Followers: 4)
International Journal of Vehicular Technology     Open Access   (Followers: 2)
International Journal of Virtual Technology and Multimedia     Hybrid Journal   (Followers: 4)
International Journal of Wavelets, Multiresolution and Information Processing     Hybrid Journal  
International Journal on Artificial Intelligence Tools     Hybrid Journal   (Followers: 4)
International Nano Letters     Open Access   (Followers: 6)
International Review of Applied Sciences and Engineering     Full-text available via subscription  
Inverse Problems in Science and Engineering     Hybrid Journal   (Followers: 2)
Ionics     Hybrid Journal  
IPTEK The Journal for Technology and Science     Open Access  
IRBM News     Full-text available via subscription  
Irrigation and Drainage Systems     Hybrid Journal  
ISA Transactions     Full-text available via subscription   (Followers: 1)
ISRN - International Scholarly Research Notices     Open Access   (Followers: 69)
ISRN Nanotechnology     Open Access  
ISRN Signal Processing     Open Access  
ISRN Thermodynamics     Open Access  
IT Professional     Full-text available via subscription   (Followers: 2)
Journal of Biosensors & Bioelectronics     Open Access   (Followers: 1)
Journal of Advanced Manufacturing Systems     Hybrid Journal   (Followers: 7)
Journal of Aerosol Science     Hybrid Journal   (Followers: 2)
Journal of Aerospace Engineering     Full-text available via subscription   (Followers: 124)
Journal of Alloys and Compounds     Hybrid Journal   (Followers: 7)
Journal of Analytical and Applied Pyrolysis     Hybrid Journal   (Followers: 3)
Journal of Analytical Science & Technology     Open Access   (Followers: 4)
Journal of Analytical Sciences, Methods and Instrumentation     Open Access   (Followers: 1)
Journal of Applied Analysis     Full-text available via subscription  
Journal of Applied and Industrial Sciences     Open Access  
Journal of Applied Logic     Full-text available via subscription  
Journal of Applied Physics     Hybrid Journal   (Followers: 152)
Journal of Applied Probability     Full-text available via subscription   (Followers: 6)
Journal of Applied Research and Technology     Open Access  
Journal of Applied Science and Technology     Full-text available via subscription  
Journal of Applied Sciences     Open Access   (Followers: 5)
Journal of Architectural Engineering     Full-text available via subscription   (Followers: 5)
Journal of ASTM International     Full-text available via subscription   (Followers: 3)
Journal of Aviation Technology and Engineering     Open Access   (Followers: 6)
Journal of Biological Dynamics     Open Access   (Followers: 1)

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Journal Cover Ionics
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   Hybrid Journal Hybrid journal (It can contain Open Access articles)
     ISSN (Print) 1862-0760 - ISSN (Online) 0947-7047
     Published by Springer-Verlag Homepage  [2210 journals]   [SJR: 0.522]   [H-I: 25]
  • Study on performance of a novel P(VDF-HFP)/SiO       class="a-plus-plus">2 composite polymer
           electrolyte using urea as pore-forming agent
    • Abstract: Abstract Novel poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP))-based composite polymer electrolyte (CPE) membranes doped with different contents of nano-SiO2 using urea as a pore-forming agent were prepared by phase inversion method, and the desired CPEs were obtained by being immersed into 1.0 M LiPF6-EC/DMC/EMC electrolytes for 0.5 h. The physicochemical properties of the CPEs were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and linear sweep voltammetry (LSV). The results show that the CPEs doped with 10 % nano-SiO2 exhibit the best performance, in which the SEM images of the as-prepared polymer membranes present homogeneous surface and abundant micropores; the uptake ratio is up to 107.4 %; EIS and LSV analysis also show that the ionic conductivity at room temperature and electrochemical stability window of the modified membrane can reach 3.652 mS cm−1 and 5.0 V, respectively; the interfacial resistance R i is 380 Ω cm−2 in the first day,then increases rapidly to a stable value about 500 Ω cm−2 in a 5-day storage at room temperature. The Li/As-fabricated CPEs/LiCoO2 cell also shows excellent charge-discharge performance, which suggests that it can be a potential electrolyte for the lithium-ion battery.
      PubDate: 2014-09-01
  • Hydrothermal synthesis of carbon- and reduced graphene oxide-supported
           CoMoO4 nanorods for
    • Abstract: Abstract Hybrid CoMoO4 nanorods with carbon (C) and graphene oxide (rGO) are successfully synthesized via one-step hydrothermal process. Hybrid α-CoMoO4 nanorods have shown excellent electrochemical performances compared to pristine CoMoO4 in alkaline electrolyte. Specifically, CoMoO4/C nanorod exhibits a maximum specific capacitance of 451.6 F g−1 at the current density of 1 A g−1, whereas CoMoO4/rGO shows high specific capacitance of 336.1 F g−1 at the same current density. Both the hybrid nanorods show good rate capability even at high current density of 20 A g−1 and long-term cyclic stability. The observed electrochemical features of the hybrid CoMoO4 nanostructure could be attributed to the presence of highly conductive carbonaceous material on unique one-dimensional nanorod microstructure which enhances the electrical conductivity of the nanorods thereby allowing faster electrolyte ion diffusion during the redox process.
      PubDate: 2014-09-01
  • Synthesis of high-performance LiFePO       class="a-plus-plus">4/C composite with a grape
           bunch structure through the hydrothermal method
    • Abstract: Abstract The LiFePO4/C composite with a grape bunch structure was synthesized through the hydrothermal method at 170 °C for 7 h and followed by being fired at 750 °C for 4 h. Commercial Li2CO3, (NH4)2Fe(SO4)2 · 6H2O, and (NH4)2HPO4 were used as raw materials. Glucose was used as in situ coating carbon source, and the hydroxylated MWCNTs were used as connecting carbon wires which could be embedded into the carbon coating to form a uniform grape bunch structure. The resultant samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), energy dispersive spectrometry (EDS), elementary analysis (EA), Raman spectroscopy, and electrochemical tests. The results show that the grape bunch structure with a low disordered/graphene (D/G) ratio was found to be well dispersed in the LiFePO4/C composite, and a three-dimensional carbonaceous network was formed which could enhance the electronic conductivity of the LiFePO4/C composite remarkably. The resultant LiFePO4/C composite shows a high discharge capacity of 160.3 mAh g−1 at 0.1 C and 110.9 mAh g−1 even at 10 C, and the cycling capacity retention rate reaches 99.6 % over 60 cycles. Besides, it also exhibits high conductivity, good reversibility, and excellent stability in EIS and CV tests.
      PubDate: 2014-09-01
  • Effect of pH waves on capacitive charging in microfluidic flow channels
    • Abstract: Abstract Novel energy-efficient desalination techniques, such as capacitive deionization (CDI), are a key element for the future of the fresh water supply, which is increasingly under stress due to the ever-growing world population and ongoing climate changes. CDI is a desalination technique where salt ions are removed from a flow channel by the application of an electrical potential difference across this channel and are stored in electrical double layers. The aim of this work is to visualize and explain the charging process of CDI using a new microfluidic approach. Namely, we implement the geometry of CDI on a chip and visualize the ion distributions in the channel using fluorescence microscopy. In contrast to normal CDI, our system was operated in the absence of flow, using non-porous electrodes. By using two pH-sensitive fluorescence dyes, we found the formation of pH waves across the channel, even though the system is operated at low potential differences in order to suppress Faradaic reactions, such as water splitting. From simulations of the transport process, we found that a small current density in the order of 0.1 A m−2 can trigger the formation of such pH waves. CDI generally benefits from large electrode areas relative to the channel cross section. However, this large area ratio will also increase the magnitude of these waves, which might lead to a reduction in desalination efficiency.
      PubDate: 2014-09-01
  • Improving the self-discharge behavior of sulfur-polypyrrole cathode
           material by LiNO3
           electrolyte additive
    • Abstract: Abstract Self-discharge characteristics of Li/S cells using pure sulfur and sulfur-polypyrrole (S-PPy) cathode materials and lithium bis(trifluoromethane)sulfonimide (LiTFSI) as the electrolyte salt were investigated by monitoring the open circuit voltage, the electrochemical impedance change, and the capacity loss during or after storage at room temperature. Corrosion behavior of the aluminum current collector was studied using linear sweep voltammetry and optical microscope observations of aluminum substrate in aged cells. The results showed that the cell with a pure sulfur cathode suffered from severe self-discharge, which is attributed to the corrosion of the current collector by LiTFSI and a rapid shuttle mechanism. However, a PPy coating on the surface of sulfur particles can suppress the shuttle effect, giving better self-discharge performance. LiNO3 was investigated as a suitable electrolyte additive to prevent the self-discharge of Li/S cells. A self-discharge rate of 3.1 % was obtained for a cell with an S-PPy cathode and a modified electrolyte containing 0.4 M LiNO3. It was found that LiNO3 acts both as a corrosion inhibitor and a shuttle inhibitor. This respectively reduces the transformation of solid sulfur to soluble lithium polysulfides and prevents the dissolved sulfur and generated polysulfides from chemical reaction with the Li anode.
      PubDate: 2014-09-01
  • Li+ transportation
           kinetics of FeF       class="a-plus-plus">3 · 0.33H       class="a-plus-plus">2O/C nanocomposite
           synthesized by one-step solid state method
    • Abstract: Abstract A new cathode material for lithium ion battery FeF3 · 0.33H2O/C was synthesized successfully by a simple one-step chemico-mechanical method. It showed a noticeable initial discharge capacity of 233.9 mAh g−1 and corresponding charge capacity of 186.4 mAh g−1. A reversible capacity of ca.157.4 mAh g−1 at 20 mA g−1 can be obtained after 50 charge/discharge cycles. To elucidate the lithium ion transportation in the cathode material, the methods of electrochemical impedance spectroscopy (EIS) and galvanostatic intermittent titration technique (GITT) were applied to obtain the lithium diffusion coefficients of the material. Within the voltage level of 2.05–3.18 V, the method of EIS showed that \( {D}_{{\mathrm{Li}}^{+}} \) varied in the range of 1.2 × 10−13 ~ 3.6 × 10−14 cm2 s−1 with a maximum of 1.2 × 10−13 cm2 s−1 at 2.5 V. The method of GITT gave a result of 8.1 × 10−14 ~ 1.2 × 10−15 cm2 s−1. The way and the range of the variation for lithium ion diffusion coefficients measured by the GITT method show close similarity with those obtained by the EIS method. Besides, they both reached their maximum at a voltage level of 2.5 V.
      PubDate: 2014-09-01
  • X-ray structure refinement, vibrational spectroscopy, and ionic
           conductivity of Na       class="a-plus-plus">0.11Ca       class="a-plus-plus">9.64Sm       class="a-plus-plus">0.23(PO       class="a-plus-plus">4)       class="a-plus-plus">6F       class="a-plus-plus">2
    • Abstract: Abstract The present paper is interested in the study of compounds from the apatite family, which is an apatite structure of individual rare earth substituted fluorapatite. In fact, an Sm-Bearing fluorapatite Ca10–2yNaySmy(PO4)6A2 with x = 0.11 and y = 0.23 has been synthesized by solid-state reaction and characterized by X-ray powder diffraction. The site occupancies of substituents are 0.01091 for Sm and 0.02601 for Na in the Ca(1) position and 0.05317 for Sm in the Ca(2) position. Besides, the observed frequencies in the Raman and infrared spectra were explained and discussed on the basis of unit cell group analyses and in comparison with fluorapatite and other fluorapatites. In addition to the proton conduction, the possibility of a Na+ contribution to the conductivity in the high-temperature phase is proposed. The highest overall conductivity values were found at σ475 °C = 2.03 × 10−5 S cm−1 and Ea = 0.60 eV.
      PubDate: 2014-09-01
  • Voltammetric determination of uric acid in the presence of ascorbic acid
           and dopamine using chitosan/ionic liquid composite electrode
    • Abstract: Abstract A chitosan/ionic liquid composite electrode was prepared and used to determine uric acid (UA) in the presence of a large excess of ascorbic acid (AA) and dopamine (DA) by linear sweep voltammetry (LSV). The modified electrode shows large peak separations between DA, AA, and UA. Due to the existence of chitosan and ionic liquid in the composite, the modified electrode exhibits strong electrochemical catalytic activity toward the oxidation of UA. Under optimal conditions, the peak current is linearly dependent on the UA concentration in the range of 5 × 10−7–2 × 10−4 M in the presence of 5 × 10−4 M AA and 5 × 10−5 M DA with a correlation coefficient of 0.9978, and the detection limit is 5 × 10−8 M at a signal-to-noise ratio of 3. With good sensitivity and stability, the constructed sensor was applied in the determination of UA in human serum samples and satisfactory results were obtained.
      PubDate: 2014-09-01
  • Pickering emulsion polymerization of polyaniline/LiCoO       class="a-plus-plus">2 nanoparticles used as
           cathode materials for lithium batteries
    • Abstract: Abstract The oil in water (o/w) emulsions were prepared using aniline dissolved in toluene and LiCoO2 particles as stabilizers (Pickering emulsions). Pickering emulsions are stabilized by adsorbed solid particles instead of emulsifier molecules. The mean droplet diameter of emulsions was controlled by the mass ratio M (oil)/M (solid particles). The emulsions showed great stability during 3 days. The composite materials containing LiCoO2 and the conductive polymer polyaniline (PANI) have been prepared by means of polymerization of aniline emulsion stabilized by LiCoO2 particles. The composite materials were characterized by nanosphere and nanofiber-like structures. The nanofiber-like morphology of the powdered material was distinctly different of the morphologies of the parent materials. The electrochemical reactivity of PANI/LiCoO2 composites as positive electrode in a lithium battery was examined during lithium ion deinsertion and insertion by galvanostatic charge–discharge testing; PANI/LiCoO2 (1:4) composite materials exhibited the best electrochemical performance by increasing the reaction reversibility and capacity compared to that of the pristine LiCoO2 cathode. The first discharge capacity of PANI/LiCoO2 (1:4) was 167 mAh/g, while that of LiCoO2 was136 mAh/g.
      PubDate: 2014-09-01
  • Ac conductivity study of lithium and potassium diphosphate LiK       class="a-plus-plus">3P       class="a-plus-plus">2O       class="a-plus-plus">7 using impedance
    • Abstract: Abstract In this work, a LiK3P2O7 ceramic material was prepared by the solid-state reaction method and identified by X-ray diffractometry. The dielectric properties, impedance characteristics, and modulus were studied over a range of frequency (200 Hz to 5 MHz) and temperature (615–708 K). The frequency and temperature dependence of dielectric permittivity, dielectric loss, and electric modulus is studied. The frequency analysis of modulus properties showed a distribution of relaxation times. Conductivity plots against frequency at a higher frequency suggested the response obeying the universal power law. The temperature behavior of the frequency exponents shows that the correlated barrier hopping CBH model is well adapted to this material. The activation energy associated with the impedance relaxation and the electric modulus spectra is close to the activation energy for dc conductivity indicating the similar nature of relaxation and conductivity. Thermodynamic parameters such as free energy of activation, enthalpy, and entropy have been calculated.
      PubDate: 2014-09-01
  • Preparation and ionic conductivity of composite polymer electrolytes based
           on hyperbranched star polymer
    • Abstract: Abstract Hyperbranched star polymer HBPS-(PPEGMA) x was synthesized by atom transfer radical polymerization (ATRP) using hyperbranched polystyrene (HBPS) as macroinitiator and poly(ethylene glycol) methyl ether methacrylate (PEGMA) as monomer. The structure of the prepared hyperbranched star polymer was characterized by 1H NMR, ATR-FTIR, and GPC. Polymer electrolytes based on HBPS-(PPEGMA) x , lithium salt, and/or nano-TiO2 were prepared. The influences of lithium salt concentration and type, nano-TiO2 content, and size on ionic conductivity of the obtained polymer electrolytes were investigated. The results showed that the low crystallinity of the prepared polymer electrolyte was caused by the interaction between lithium salt and polymer. The addition of TiO2 into HBPS-(PPEGMA) x /LiTFSI improved the ionic conductivity at low temperature. The prepared composite polymer electrolyte showed the highest ionic conductivity of 9 × 10−5 S cm−1 at 30 °C when the content of TiO2 was 15 wt% and the size of TiO2 was 20 nm.
      PubDate: 2014-09-01
  • Incorporation of NH       class="a-plus-plus">4Br in PVA-chitosan
           blend-based polymer electrolyte and its effect on the conductivity and
           other electrical properties
    • Abstract: Abstract Polymer electrolyte system based on poly(vinyl alcohol) (PVA)-chitosan blend doped with ammonium bromide (NH4Br) has been prepared by solution cast method. Fourier transform infrared (FTIR) spectroscopy analysis confirms the complexation between salt and polymer host. The highest ionic conductivity obtained at room temperature is (7.68 ± 1.24) × 10−4 S cm−1 for the sample comprising of 30 wt% NH4Br. X-ray diffraction (XRD) patterns reveal that PVA-chitosan with 30 wt% NH4Br exhibits the most amorphous structure. Thermogravimetric analysis (TGA) reveals that the electrolytes are stable until ∼260 °C. The conductivity variation can also be explained by field emission scanning electron microscopy (FESEM) study. Dielectric properties of the electrolytes follow non-Debye behavior. The conduction mechanism of the highest conducting electrolyte can be represented by the correlated barrier hopping (CBH) model. From linear sweep voltammetry (LSV) result, the highest conducting electrolyte is electrochemically stable at 1.57 V.
      PubDate: 2014-09-01
  • Sensitive voltammetric determination of cysteamine using promazine
           hydrochloride as a mediator and modified multi-wall carbon nanotubes
           carbon paste electrodes
    • Abstract: Abstract This paper presents a sensitive electrochemical method for the determination of cysteamine (CA) using promazine hydrochloride-modified multi-wall carbon nanotubes carbon paste electrode (PrH/MWCNTs CPE). Because of the good electrochemical activity of MWCNTs and the acceptable performance of promazine hydrochloride (PrH) as an electrocatalytic mediator, the modified electrode significantly enhanced the sensitivity for the detection of CA in comparison to the bare carbon paste electrode (CPE). All chemical parameters such as pH of solution, concentration of PrH and kinetic parameters of the system were investigated. Linear sweep voltammetric (LSV) method was used to follow the electrocatalytic effect of CA on the current–potential response of PrH. Under optimum conditions, the obtained net peak current ∆I p(I sample − I blank) was linear with CA concentrations in two dynamic ranges of 2.0–346.5 μmol l−1 (∆I p = (0.0195 ± 0.0043)C CA + (0.7648 ± 0.0397) (r 2 = 0.9948)) and 346.5–1,912.5 μmol l−1 (∆I p = (0.0100 ± 0.0026)C CA + (3.8981 ± 0.0828) (r 2 = 0.9911)) with a detection limit of 0.8 μmol l−1. Finally, the PrH/MWCNTs CPE was successfully applied for the determination of CA in urine and drug samples with satisfactory results.
      PubDate: 2014-09-01
  • Organosilicon functionalized quaternary ammonium ionic liquids as
           electrolytes for lithium-ion batteries
    • Abstract: Abstract Organosilicon-functionalized quaternary ammonium ionic liquids (ILs) with oligo(ethylene oxide) substituent are designed and synthesized. Such properties as viscosity, conductivity, and thermal/electrochemical stability of these ILs are characterized. These ILs are miscible with the commercial carbonate electrolyte (EC: DEC = 1:1(w/w), 1 M LiPF6) and are used as cosolvents to form hybrid electrolytes in proportions up to 30 vol%. By using such hybrid electrolytes, the LiFePO4/Li half cells exhibit no deterioration in specific capacity and cyclability, and the graphite/Li half cells show improved compatibility in the presence of lithium oxalyldifluoroborate. These hybrid electrolytes exhibit less flammability compared with the commercial baseline electrolyte, and thus improved safety for use in lithium-ion batteries.
      PubDate: 2014-09-01
  • Effect of ultrasonic irradiation and TiO       class="a-plus-plus">2 on the determination of
           electrical and dielectric properties of
           PEO–P(VdF-HFP)–LiClO       class="a-plus-plus">4-based nanocomposite polymer
           blend electrolytes
    • Abstract: Abstract Nanocomposite polymer blend electrolytes composed of PEO–P(VdF-HFP)–LiClO4 were prepared for various concentrations of TiO2 nanofiller. All the composite electrolytes were subjected to ultrasonic irradiation for enhancing the ionic conductivity of the composite electrolytes. It was noted that the ultrasonic irradiated samples exhibited a higher ionic conductivity than the non-radiated samples. In addition, filler concentration in the complex was also optimized based on ionic conductivity, and it was noted that the sample containing 6 wt% showed maximum value about 1.451 × 10−5 S cm−1; however, this is lower than the value obtained from the irradiated samples (2.27 × 10−4 S cm−1). The dielectric, modulus and tangent loss behaviour of the samples were also estimated and discussed. Thermal and surface images studies were also carried out using TG/DTA and AFM studies, respectively. In addition, mobility and diffusion coefficient characteristics were also evaluated.
      PubDate: 2014-08-31
  • Effect of oxygen activity on chromium segregation in Cr-doped TiO       class="a-plus-plus">2 single crystal
    • Abstract: Abstract The present work determined the effect of chromium segregation on surface and near-surface composition of Cr-doped TiO2 (0.05 at.% Cr) after annealing in oxidising and strongly reducing environments at 1,073 and 1,273 K. The segregation-induced depth profiles were determined by secondary ion mass spectrometry (SIMS). It was observed that annealing in oxidising conditions [p(O2) = 105 Pa] and reducing conditions [10−11 Pa > p(O2) > 10−15 Pa] results in an enrichment and depletion of the surface layer in chromium, respectively. The observed effects may be used for tailoring the surface and near-surface composition in order to impose desired properties.
      PubDate: 2014-08-30
  • Improvement of BaCe       class="a-plus-plus">0.8Sm       class="a-plus-plus">0.1Y       class="a-plus-plus">0.1O       class="a-plus-plus">3-δ-based IT-SOFC by
           optimizing spin-coated process of cathode and sintering temperature
    • Abstract: Abstract Proton-conducting electrolyte with Sm and Y co-doped BaCeO3 (BaCe0.8Sm0.1Y0.1O3-δ, BCSY) were prepared by sol–gel combustion method. The characterization of proton-conducting electrolyte was evaluated in saturated humidity by structure identification, such as X-ray diffraction (XRD). Anode-supported cell with configuration of Ni-BCSY/BCSY/SSC (Sm0.5Sr0.5CoO3-δ) were fabricated. The cell with cathode after two coats and sintering temperature of 1,050 °C showed superior electrical performance. It was achieved with open circuit voltage (OCV) of 0.99 V and P max of 220 mW/cm2 at 600 °C when humidified (3 vol.% H2O) hydrogen as fuel and oxygen as oxidant.
      PubDate: 2014-08-27
  • Low-temperature co-sintering of co-ionic conducting solid oxide fuel cells
           based on Ce       class="a-plus-plus">0.8Sm       class="a-plus-plus">0.2O       class="a-plus-plus">1.9-BaCe       class="a-plus-plus">0.8Sm       class="a-plus-plus">0.2O       class="a-plus-plus">2.9 composite electrolyte
    • Abstract: Abstract A composite electrolyte Ce0.8Sm0.2O1.9-BaCe0.8Sm0.2O2.9 (SDC-BCS) material for co-ionic conducting solid oxide fuel cells was prepared by microwave-assisted sol-gel technique. The crystallization, morphology, and sintering characteristics were investigated by X-ray diffraction and scanning electron microscopy. The obtained SDC-BCS composite electrolyte powders distribute uniformly, and SDC and BCS crystalline grains play a role as matrix for each other in the composite electrolyte. Anode-supported solid oxide fuel cells of NiO-Ce0.8Sm0.2O1.9/Ce0.8Sm0.2O1.9-BaCe0.8Sm0.2O2.9/Ce0.8Sm0.2O1.9-SrCo0.9Ti0.1O2.55 (NiO-SDC/SDC-BCS/SDC-SCT) were fabricated based on the nanocomposite electrolyte powders. The electrochemical performances were tested at 500–650 °C using humidified hydrogen as fuel. Results demonstrated that the anode-supported half cells could be sintered at 1,300 °C with a dense electrolyte layer and a porous anode structure. Moreover, the single cell with 40-μm-thick electrolyte layer achieved an open-circuit voltage (OCV) of 0.77 V and a maximum power density of 621 mW cm−2 at 650 °C.
      PubDate: 2014-08-21
  • Polymer electrolyte for photoelectrochemical cell and dye-sensitized solar
           cell: a brief review
    • Abstract: Abstract This paper reviews the use of solid polymeric electrolyte (SPE) and gel polymeric electrolyte (GPE) in photoelectrochemical cell (PEC) and dye-sensitized solar cell (DSSC). The structure of PEC and its working principle are presented. The various types of polymer electrolytes utilized in PEC and DSSC have been highlighted in this review. It also highlights the comparison of performance of PEC and DSSC utilizing those polymer electrolytes. This review is completed with the list of other SPEs that potentially be tested in DSSC.
      PubDate: 2014-08-06
  • Total conductivity in Sc-doped LaTiO       class="a-plus-plus">3 + δ
    • Abstract: Abstract A series of Sc-doped lanthanum titanate perovskites, LaTi(1 − x)Sc x O3 + δ with x = 0, 0.2, 0.25 and 0.3, was prepared by sol-gel method. All compositions were found to exhibit orthorhombic crystal structure. An increase in unit cell volume was observed for composition with x = 0.2. The oxidation states of La3+, Sc3+ and Ti3+ ions have been established using X-ray photoelectron spectroscopy (XPS). It is observed that an enhancement in total conductivity of LaTiO3 + δ perovskite is achieved only at lower doping concentration. A reverse effect is observed for higher dopant concentration.
      PubDate: 2014-08-06
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