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  Subjects -> ENGINEERING (Total: 2167 journals)
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ENGINEERING (1173 journals)            First | 2 3 4 5 6 7 8 9 | Last

International Journal of Grid and Utility Computing     Hybrid Journal  
International Journal of Heat and Fluid Flow     Hybrid Journal   (Followers: 19)
International Journal of Heat and Mass Transfer     Hybrid Journal   (Followers: 129)
International Journal of Heavy Vehicle Systems     Hybrid Journal   (Followers: 8)
International Journal of Hypersonics     Full-text available via subscription   (Followers: 3)
International Journal of Imaging Systems and Technology     Hybrid Journal   (Followers: 2)
International Journal of Impact Engineering     Hybrid Journal   (Followers: 8)
International Journal of Information Acquisition     Hybrid Journal   (Followers: 1)
International Journal of Innovation and Applied Studies     Open Access   (Followers: 4)
International Journal of Innovation Science     Full-text available via subscription   (Followers: 7)
International Journal of Innovative Technology and Research     Open Access   (Followers: 1)
International Journal of Integrated Engineering     Open Access  
International Journal of Intelligent Engineering Informatics     Hybrid Journal  
International Journal of Intelligent Systems and Applications in Engineering     Open Access  
International Journal of Lifecycle Performance Engineering     Hybrid Journal   (Followers: 1)
International Journal of Machine Tools and Manufacture     Hybrid Journal   (Followers: 5)
International Journal of Manufacturing Research     Hybrid Journal   (Followers: 5)
International Journal of Manufacturing Technology and Management     Hybrid Journal   (Followers: 7)
International Journal of Materials and Product Technology     Hybrid Journal   (Followers: 3)
International Journal of Mathematical Education in Science and Technology     Hybrid Journal   (Followers: 8)
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: 4)
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: 3)
International Journal of Nanomanufacturing     Hybrid Journal  
International Journal of Nanoscience     Hybrid Journal  
International Journal of Nanotechnology     Hybrid Journal   (Followers: 6)
International Journal of Nanotechnology and Molecular Computation     Full-text available via subscription   (Followers: 3)
International Journal of Navigation and Observation     Open Access   (Followers: 11)
International Journal of Network Management     Hybrid Journal  
International Journal of Nonlinear Sciences and Numerical Simulation     Hybrid Journal  
International Journal of Numerical Methods for Heat & Fluid Flow     Hybrid Journal   (Followers: 8)
International Journal of Optics     Open Access   (Followers: 1)
International Journal of Organisational Design and Engineering     Hybrid Journal   (Followers: 10)
International Journal of Pattern Recognition and Artificial Intelligence     Hybrid Journal   (Followers: 6)
International Journal of Pavement Engineering     Hybrid Journal   (Followers: 3)
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   (Followers: 1)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 5)
International Journal of Polymer Science     Open Access   (Followers: 20)
International Journal of Precision Engineering and Manufacturing     Hybrid Journal   (Followers: 5)
International Journal of Precision Engineering and Manufacturing-Green Technology     Hybrid Journal  
International Journal of Precision Technology     Hybrid Journal  
International Journal of Pressure Vessels and Piping     Hybrid Journal   (Followers: 4)
International Journal of Production Economics     Hybrid Journal   (Followers: 14)
International Journal of Quality and Innovation     Hybrid Journal   (Followers: 5)
International Journal of Quality Assurance in Engineering and Technology Education     Full-text available via subscription   (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: 4)
International Journal of Reliability, Quality and Safety Engineering     Hybrid Journal   (Followers: 8)
International Journal of Renewable Energy Technology     Hybrid Journal   (Followers: 9)
International Journal of Robust and Nonlinear Control     Hybrid Journal   (Followers: 3)
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: 2)
International Journal of Software Engineering and Knowledge Engineering     Hybrid Journal   (Followers: 2)
International Journal of Space Science and Engineering     Hybrid Journal   (Followers: 2)
International Journal of Speech Technology     Hybrid Journal   (Followers: 5)
International Journal of Spray and Combustion Dynamics     Full-text available via subscription   (Followers: 7)
International Journal of Superconductivity     Open Access  
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: 8)
International Journal of Sustainable Engineering     Hybrid Journal   (Followers: 7)
International Journal of Sustainable Manufacturing     Hybrid Journal   (Followers: 5)
International Journal of Systems and Service-Oriented Engineering     Full-text available via subscription  
International Journal of Systems Assurance Engineering and Management     Hybrid Journal  
International Journal of Systems, Control and Communications     Hybrid Journal   (Followers: 2)
International Journal of Technoethics     Full-text available via subscription   (Followers: 1)
International Journal of Technology Management and Sustainable Development     Hybrid Journal   (Followers: 1)
International Journal of Technology Policy and Law     Hybrid Journal   (Followers: 6)
International Journal of Telemedicine and Applications     Open Access   (Followers: 2)
International Journal of Thermal Sciences     Hybrid Journal   (Followers: 8)
International Journal of Thermodynamics     Open Access   (Followers: 3)
International Journal of Turbo & Jet-Engines     Hybrid Journal   (Followers: 1)
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: 8)
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: 5)
International Journal of Vehicular Technology     Open Access   (Followers: 3)
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: 7)
International Review of Applied Sciences and Engineering     Full-text available via subscription  
International Scholarly Research Notices     Open Access   (Followers: 235)
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  
Ironmaking & Steelmaking     Hybrid Journal   (Followers: 2)

  First | 2 3 4 5 6 7 8 9 | Last

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  [2281 journals]
  • Vinyl ethylene carbonate as an electrolyte additive for high-voltage LiNi
           0.4 Mn 0.4 Co 0.2 O 2 /graphite Li-ion batteries
    • Abstract: Abstract Vinyl ethylene carbonate (VEC) is investigated as an electrolyte additive to improve the electrochemical performance of LiNi0.4Mn0.4Co0.2O2/graphite lithium-ion battery at higher voltage operation (3.0–4.5 V) than the conventional voltage (3.0–4.25 V). In the voltage range of 3.0–4.5 V, it is shown that the performances of the cells with VEC-containing electrolyte are greatly improved than the cells without additive. With 2.0 wt.% VEC addition in the electrolyte, the capacity retention of the cell is increased from 62.5 to 74.5 % after 300 cycles. The effects of VEC on the cell performance are investigated by cyclic voltammetry(CV), electrochemical impedance spectroscopy(EIS), x-ray powder diffraction (XRD), energy dispersive x-ray spectrometry (EDS), scanning electron microscopy (SEM), and attenuated total reflectance-Fourier transform infrared (ATR-FTIR). The results show that the films electrochemically formed on both anode and cathode, derived from the in situ decomposition of VEC at the initial charge–discharge cycles, are the main reasons for the improved cell performance.
      PubDate: 2015-09-02
       
  • Corn stalk-derived activated carbon with a stacking sheet-like structure
           as sulfur cathode supporter for lithium/sulfur batteries
    • Abstract: Abstract A novel stacking sheet-like carbon (SSC) has been synthesized by carbonizing the corn stalks and composited with sulfur to prepare a cathode for lithium/sulfur batteries. Scanning electronic microscopy observations showed the formation of irregularly interlaced nanosheet-like structure consisting SSC with uniform sulfur coating on its surface. The SSC nanoflakes in the composite act as nanocurrent collectors, favoring the charge carrier ion transport and electrolyte diffusion. The interlaced SSC nanoflakes irregularly stack together and form a three-dimensional network, which is beneficial for both trapping soluble polysulfide intermediates and rendering the electrical conductivity of the composite electrode. A lithium cell employing this sulfur/stacking sheet-like carbon (S/SSC) composite cathode delivered an initial discharge capacity of 965 mAh g−1 at 0.2 C and retained a capacity of 743 mAh g−1 over 100 charge-discharge cycles. Even at 3.2 C rate, the lithium cell with the S/SSC composite cathode demonstrated an excellent rate capability, delivering a highly reversible discharge capacity of 418 mAh g−1.
      PubDate: 2015-09-02
       
  • Voltammetric behavior of bupirimate fungicide and its square wave
           voltammetric determination
    • Abstract: Abstract The voltammeric behavior of bupirimate fungicide has been studied by square wave stripping voltammetry (SWSV). The insoluble R–HgS salt (where R is the bupirimate frame excluding sulfur) formed on the static hanging mercury drop electrode (SHMDE) was electrochemically reduced by giving a fairly well defined cathodic peak within the pH range of 1.0 to 8.0. The peak potentials (E p) were shifted toward more negative values with increasing pH, and a maximum peak response appeared at −1320 mV (vs. Ag/AgCl) at a pH 6.0. The calibration plot was a straight line in the range of 0.013 to 9.43 mg L−1. The detection limit at pH 6.0 was measured as 4.0 μg L−1 under the conditions of E acc = −700 mV and t acc = 10 s. The validity of the recommended method was assessed from the recoveries of spiked tap water, natural peach juice, and commercial peach juice.
      PubDate: 2015-09-02
       
  • Synthesis and electrochemical properties of Li 1.2 Mn 0.54 Ni 0.13 Co 0.13
           O 2 cathode material for lithium-ion battery
    • Abstract: Abstract The layered Li1.2Mn0.54Ni0.13Co0.13O2 lithium-rich manganese-based solid solution cathode material has been synthesized by a simple solid-state method. The as-prepared material has a typical layered structure with R-3m and C2/m space group. The synthesized Li1.2Mn0.54Ni0.13Co0.13O2 has an irregular shape with the size range from 200 to 500 nm, and the primary particle of Li1.2Mn0.54Ni0.13Co0.13O2 has regular sphere morphology with a diameter of 320 nm. Electrochemical performances also have been investigated. The results show that the cathode material Li1.2Mn0.54Ni0.13Co0.13O2 prepared at 900 °C for 12 h has a good electrochemical performance, which can deliver a high initial discharge capacity of 233.5, 214.2, 199.3, and 168.1 mAh g−1 at 0.1, 0.2, 0.5, and 1 C, respectively. After 50 cycles, the capacity retains 178.0, 166.3, 162.1, and 155.9 mAh g−1 at 0.1, 0.2, 0.5, and 1 C, respectively. The results indicate that the simple method has a great potential in synthesizing manganese-based cathode materials for Li-ion batteries.
      PubDate: 2015-09-02
       
  • High-performance electrochemical amperometric sensors for the sensitive
           determination of phenyl urea herbicides diuron and fenuron
    • Abstract: Abstract We have described the fabrication of high-performance amperometric sensors derived from graphene oxide–multiwalled carbon nanotube (GO–MWCNT) composite for the sensitive determination of diuron and fenuron. GO–MWCNT composite was prepared by simple solution-based approach, and its formation was confirmed by scanning electron microscopy, transmission electron microscopy and UV-visible spectroscopy methods. GO–MWCNT film-modified glassy carbon electrode exhibited excellent electrocatalytic performance in the oxidation of diuron and fenuron in terms of less overpotential and highly enhanced peak currents. GO–MWCNTs have presented significantly improved electrocatalytic performance than dimethylformamide-dispersed MWCNTs. GO–MWCNT-based amperometric sensor has been fabricated which detects diuron in wide linear range between 9 μM and 0.38 mM with high sensitivity of 0.645 μA μM−1 cm−2. The amperometric sensor also detects fenuron in broad linear range between 0.9 and 47 μM with sensitivity of 1.20 μA μM−1 cm−2. Moreover, the sensor offers appreciable repeatability, reproducibility, and stability results. Practical feasibility of the prepared amperometric sensor has been assessed in various water samples collected from agricultural areas.
      PubDate: 2015-09-01
       
  • Effects of Fe-dopings through solid solution and grain-boundary
           segregation on the electrical properties of CeO 2 -based solid electrolyte
           
    • Abstract: Abstract The 1 and 10 mol% Gd-doped ceria (1- and 10-GDC) solid solution powders were synthesized by co-precipitation method, then which were doped with 0.5 mol% Fe by the means of solid solution (SS) and preferred grain-boundary segregation (GBS), named as GDC-0.5Fe (SS) and (GBS), respectively. All the synthesized powders only show the CeO2 solid solution phase with grain sizes of 15.8~16.8 nm. Then, the corresponding GDC ceramics before and after Fe-doping were sintered at 800 °C for 1 h. The sole ceria solid solution phase appears in all the sintered samples with grain sizes of 59.8~112 nm. The Fe doping through solid solution always leads to the decrement in the electrical conductivity of both 1- and 10-GDC samples, while that through controlled grain-boundary segregation results in the increment of 10-GDC sample. The ion transference numbers of 1- and 10-GDC-0.5Fe (GBS) samples are all above 0.95 in 300~650 °C.
      PubDate: 2015-09-01
       
  • NiO hybrid nanoarchitecture-based pseudocapacitor in organic electrolyte
           with high rate capability and cycle life
    • Abstract: Abstract A 3D hierarchical NiO nanostructures with combined microstructure of nanoflakes and nanoflowers have been fabricated on carbon fibre cloth (CFC). Unique nano-micro structural features of NiO/CFC electrode showed an enhanced electrochemical activity in organic electrolyte (1 M tetraethylammonium tetrafluorborate (TEABF4) in propylene carbonate) in terms of rate capability, specific energy and power performance as well as potential limit. The electrode showed a specific capacitance of 170 Fg−1 for a current density of 5 Ag−1. Configured as a two-electrode symmetric supercapacitor, the device showed a specific capacitance of 34.9 Fg−1 at 1 Ag−1 current density. It delivered a maximum specific energy density of 19.4 Wh kg−1 at a high power density of 1002.8 W kg−1 at a constant current density of 1 Ag−1. The cell is also capable of long-term cycling stability with an efficiency of 58 % after 25,000 cycles with a potential window of 0 to ±2 V. This superior electrochemical activity of the NiO electrode is due to their structural benefits of well-connected hybrid nano/mesoporous structure and rapid ion intercalation within the porous electrode surface.
      PubDate: 2015-09-01
       
  • Dielectric relaxation and ionic conductivity studies of (C 6 H 20 N 3
           )BiCl 6 ·H 2 O
    • Abstract: Abstract The dielectric and the conduction characteristics of (C6H20N3)BiCl6·H2O from room temperature (290 K) to 355 K have been investigated by using impedance spectroscopy. The temperature-dependent conductivity and the relaxation times show a break in both the conductivity and the relaxation time around 335 K corresponding to the (I → II) phase transition temperature. Combined impedance and modulus plots were used as tools to analyze the sample behavior as a function of frequency at different temperatures. The modulus analysis and impedance studies showed the non-Debye dielectric relaxation nature. The Z′ and Z″ versus frequency plots in both phases I and II can be modeled as a parallel contribution of bulk resistance R p and a constant phase element (CPE). The frequency dependence of the complex conductivity and the electric modulus spectra are analyzed by the “universal dielectric response” (UDR) and Kohlrausch, Williams, and Watts (KWW) approaches, and a comparison between the parameters derived from the two approaches has been discussed.
      PubDate: 2015-09-01
       
  • High performance Na 3 V 2 (PO 4 ) 3 /C composite electrode for sodium-ion
           capacitors
    • Abstract: Abstract Sodium-ion capacitors were assembled with Na3V2(PO4)3/C composite cathode and activated carbon (AC) anode. In this work, Na3V2(PO4)3 (NVP) and NVP/C have been investigated as electrode materials in sodium ion capacitors for the first time. Electrochemical tests, such as cyclic voltammetry (CV), chronopotentiometry, and cycling were also performed to study the behavior of NVP and NVP/C. The specific capacitance and energy density of NVP/C composite electrode are as high as 51.0 F g−1 and 15.9 Wh kg−1. The optimized voltage range of sodium-ion capacitors is from 0 to 1.5 V. NVP/C composite demonstrates that it retained up to 80 % of the initial capacitance after 100 cycles. The outperforming results could be ascribed to the NVP/C composite, which indicates that NVP/C composite is more suitable as cathodematerials for sodium-ion capacitors.
      PubDate: 2015-09-01
       
  • Preparation and characterization LiFePO 4 /C nanowires and their improved
           performance for lithium-ion batteries
    • Abstract: Abstract LiFePO4/C nanowires were successfully synthesized via evaporated self-assembly assisted by polyvinyl alcohol at room temperature. The structure, morphology, and composition of the as-prepared products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TG). The experimental results show that LiFePO4/C nanowires are uniform about 50–100 nm in diameter and 1 μm in length. LiFePO4/C nanowires exhibit excellent electrochemical performance and attain the discharge-specific capacity of 155 mAhg−1 at 1C rate and 118 mAhg−1 at 20C rate. The capacity retention is 98 % after 100 cycles at 20C rate.
      PubDate: 2015-09-01
       
  • Synthesis of pyridine-based task-specific ionic liquid with alkyl
           phosphate cation and extraction performance for uranyl ion
    • Abstract: Abstract A pyridine-based task-specific ionic liquid (TSIL) designed to extract uranyl ion (U (VI)) from nitric acid medium was synthesized through the introduction of tributyl phosphate functional group in cationic of the ionic liquid. Its structure was confirmed by Fourier transform infrared spectrometer, nuclear magnetic resonance spectrum, and element analysis. The TSIL can be used simultaneously as solvents and extractants for extracting U (VI) in nitric acid medium. Preliminary extraction data showed that it could be efficiently used to extract U (VI) in nitric acid medium at room temperature.
      PubDate: 2015-09-01
       
  • Studies on noble metal-free carbon-based cathodes for
           magnesium–hydrogen peroxide fuel cells
    • Abstract: Abstract The magnesium–hydrogen peroxide (Mg–H2O2) fuel cell is developed using a noble metal-free carbon-based cathode. Carbon felt and carbon cloth are used as a cathode, and the performance was evaluated in a single cell of 30 cm2 electrode area with aq. NaCl as an anolyte and acidified hydrogen peroxide solution as a catholyte. The influence of hydrogen peroxide, sulfuric acid concentration, operating temperature, and flow rate on the performance of Mg–H2O2 fuel cell is studied. Compared with carbon cloth-based cathode, a carbon felt-based cathode has shown better fuel cell performance. The maximum power density of 91 mW cm−2 is obtained with carbon felt-based cathode, and the stability of the Mg–H2O2 is tested for about 24 h.
      PubDate: 2015-09-01
       
  • Response of a new multi-walled carbon nanotubes modified carbon paste
           electrode to 1-hexyl-3-methylimidazolium cation in aqueous solution
    • Abstract: Abstract 1-Hexyl-3-methylimidazolium tetraphenylborate ([C6mim]-TPB) was synthesized and explored as ion exchanger in carbon paste electrode (CPE) as an ion-selective electrode (ISE). The electrode was found to be optimal with the composition of 42 % graphite powder, 20 % paraffin oil, 30 % ion exchanger, 5 % MWCNTs, and 3 % nano-silica. The as-prepared electrode exhibits a Nernstian response (59.2 mV per decade) to 1-hexyl-3-methylimidazolium cation in the concentration range from 1.0 × 10−5 to 1.0 × 10−2 mol kg−1. The novel as-prepared MWCNTs/nano-silica/CPE was successfully applied in the detection of [C6mim]+ in distilled water, tap water, and river water with satisfactory results.
      PubDate: 2015-09-01
       
  • Facile synthesis of polyaniline/NiCo 2 O 4 nanocomposites with enhanced
           electrochemical properties for supercapacitors
    • Abstract: Abstract Polyaniline/NiCo2O4 nanocomposites (PANI/NiCo2O4) with different amounts of NiCo2O4 (5, 8, 10, 15, and 20 wt%) were prepared via in situ chemical oxidation polymerization in the presence of the NiCo2O4 particles, while the NiCo2O4 nanoparticles were synthesized by a modified sol–gel method. The structure and morphology of PANI/NiCo2O4 nanocomposites were characterized by Fourier transform infrared (FT-IR), X-ray diffraction (XRD), and scanning electron microscopy (SEM) techniques, respectively. The electrochemical properties of PANI/NiCo2O4 nanocomposites were investigated by cyclic voltammetry, galvanostatic charge–discharge test, and electrochemical impedance spectroscopy (EIS) in 0.5 mol L−1 H2SO4 electrolyte in three-electrode system. The PANI/10 wt% NiCo2O4 nanocomposites show larger specific capacitance of 439.4 F g−1 at a current density of 5 mA cm−2 and lower resistance compared with the pure PANI. The charge–discharge tests showed that the PANI/NiCo2O4 nanocomposites possessed good cycling stability. It maintained about 66.11 % of the initial capacitance after 1000 cycles at a current density of 5 mA cm−2. The results indicated that the PANI/NiCo2O4 nanocomposites are a promising material for supercapacitors.
      PubDate: 2015-09-01
       
  • Enhancing the cycling stability of a carbonate-based electrolyte for
           high-voltage lithium batteries by adding succinic anhydride
    • Abstract: Abstract We investigate the performance effects of adding succinic anhydride (SA) to a carbonate-based electrolyte in a high-voltage lithium-ion battery (LIB). The SA significantly improves the electrolyte’s performance, especially its stability, for a 5-V LIB with high-potential LiNi0.5Mn1.5O4 as the cathode material. The oxidation of the carbonate-based electrolyte is strongly inhibited, with the onset potential of oxidation delayed by ca. 0.5 V, as SA has a lower oxidative stability than the carbonate and thus decomposes first. When a sample containing 3 wt% SA is used as the electrolyte for a Li/LiNi0.5Mn1.5O4 half cell, the cell exhibits quite good cycling stability; the capacity fade up to 200 cycles at 1 and 2 C is 90 and 92 %, compared with only 48 and 47 % for a cell containing the standard electrolyte. The electrolyte and cathode are characterized with electrochemical impedance spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy, which demonstrate that a stable protective film is formed on the cathode’s surface in the presence of SA, resulting in the good cycling stability of Li/LiNi0.5Mn1.5O4 half cells at room temperature.
      PubDate: 2015-09-01
       
  • Synthesis temperature dependence of the structural and electrochemical
           properties of Mg 2 Si anodic materials prepared via a hydrogen-driven
           chemical reaction
    • Abstract: Abstract To obtain the optimal hydrogen-driven chemical reaction process for the preparation of Mg2Si as an anodic material of Li-ion batteries, the effects of the dehydrogenation temperatures on the structure and electrochemical properties are systematically investigated. The results indicate that Mg2Si prepared by isothermal dehydrogenation at 310 and 330 °C exhibit better cycling stability than the samples prepared at 290 and 350 °C due to the joint effects of the product purity and the particle size, especially for the 330 °C-prepared sample. In particular, the initial discharge capacity of the Mg2Si prepared at 330 °C is 1010 mAh/g with a coulombic efficiency of 92 %. After 50 cycles, the discharge capacity is approximately 416 mAh/g and the corresponding capacity retention is calculated to be approximately 41 %.
      PubDate: 2015-09-01
       
  • Highly dispersed ultrafine palladium nanoparticles on three-dimensional
           mesoporous carbon for formic acid electro-oxidation
    • Abstract: Abstract Highly dispersed ultrafine palladium nanoparticles have been uniformly decorated on a nano-CaCO3-templated three-dimensional mesoporous carbon (MC) matrix through a facile chemical reduction approach. Owing to its unique structural features, the as-prepared Pd/MC nanohybrid manifests markedly enhanced electrocatalytic performance in terms of catalytic activity and durability toward formic acid oxidation compared with conventional Pd/XC-72 electrocatalyst.
      PubDate: 2015-09-01
       
  • Surface X-ray diffraction study and photocatalytic activity of HF-treated
           single crystal rutile TiO 2 (001) surface
    • Abstract: Abstract The photocatalytic activity of a hydrogen fluoride (HF)-treated rutile TiO2(001) surface for the decomposition reaction of linoleic acid was lower than that of an as-received (polished) rutile TiO2(001) surface. The surfaces of as-received TiO2(001) and HF-treated TiO2(001) were investigated using low-energy electron diffraction (LEED) and surface X-ray diffraction (SXRD) to elucidate differences in their photocatalytic activities. The as-received (polished) surface did not yield good LEED patterns, which implied that the surface was not well-ordered and was thus not examined using SXRD. In contrast, the HF-treated surface produced good LEED patterns with a 1 × 1 structure and was thus studied using SXRD. The analysis of crystal truncation rods indicated that all atoms in the four layers of the surface moved toward the bulk and that the HF-treated surface was (101)-faceted with terraces. On average, the facet was found to be four layers deep. The difference in the condition of the surface influences the photocatalytic activity of the surface.
      PubDate: 2015-09-01
       
  • Selenium/pomelo peel-derived carbon nanocomposite as advanced cathode for
           lithium-selenium batteries
    • Abstract: Abstract Fruit waste pomelo peel was employed as raw material to prepare a highly porous and partial graphitized carbon material (pomelo peel-derived carbon (PPDC)). Se/PPDC nanocomposite was fabricated through ball milling and melt diffusion of selenium and PPDC mixture powder. The characterization results showed that selenium with 47 % loading content were confined homogenously in the small pores (<4 nm) of the PPDC matrix. As a novel cathode material for rechargeable lithium batteries, Se/PPDC exhibited high specific capacity, good cycling stability, and C-rate performance when using sodium alginate (SA) as binder and low-cost LiPF6-EC-DEC as electrolyte. During the initial 30 cycles, a steady capacity of 650 mAh g−1 approaching to theoretic specific capacity was obtained at a current density of 150 mA g−1. At a high current density of 900 mA g−1, Se/PPDC delivered a reversible capacity of 410 mAh g−1 with nearly 100 % coulombic efficiency. The advanced electrochemical performance of Se/PPDC demonstrated that PPDC would be a promising porous carbon substrate to develop space-confined selenium cathode for rechargeable lithium batteries.
      PubDate: 2015-09-01
       
  • Effects of ethylene sulfite as a supplementary film-forming additive on
           
    • Abstract: Abstract The effect of ethylene sulfite (ES) as a supplementary film-forming additive on the electrochemical performance of graphite anode in ethylene carbon (EC)-based electrolyte is studied in this research by constant current charge–discharge test, cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). Results show that ES addition can change the composition of solid electrolyte interface (SEI) coating on the surface of graphite anode by inhibiting the formation of inorganic compounds in a specific stage. XPS and SEM results confirm that SEI formed in the ES-added electrolyte contains less inorganic compounds. EIS measurements further reveal that ES addition can significantly reduce the resistance of the SEI layer and interface of graphite anode–electrolyte.
      PubDate: 2015-09-01
       
 
 
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