Performance Of Vn As Negative Electrode Materials In Electrochemical Capacitors,
2013
College of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China
Performance Of Vn As Negative Electrode Materials In Electrochemical Capacitors, Zhao-Hui Gao, Hao Zhang, Gao-Ping Cao, Min-Fang Han, Yu-Sheng Yang
Journal of Electrochemistry
Nanocrystalline vanadium nitride (VN) materials were synthesized by high temperature ammonia (NH3) reduction of vanadium oxide (V2O5). The structure and morphology of VN materials were characterized by XRD, SEM and TEM, while the specific surface area, pore size distribution and supercapacitive behavior by N2 absorption, cyclic voltammetry (CV) and constant current charge-discharge measurements in 1 mol·L-1 KOH electrolyte. The results showed that the VN sample belonged to the cubic crystal system (Fm3m [225]), and had homogeneous surface and appeared nearly spherical with uniform size. As the reaction time was extended to 12 h, …
Electrochemical Performance Of Lifepo4/C Synthesized Via Aqueous Solution-Evaporation Route,
2013
Department of Chemistry, Nanchang University, Nanchang 330031, Jiangxi, China;
Electrochemical Performance Of Lifepo4/C Synthesized Via Aqueous Solution-Evaporation Route, Ning-Yu Gu, Xing-Hua He, Yang Li
Journal of Electrochemistry
The LiFePO4/C samples have been synthesized via an aqueous solution-evaporation route with LiH2PO4, FeC2O4.2H2O as raw materials and citric acid as a carbon source. X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were used to analyze structure and morphology of the samples. The electrochemical performances of the LiFePO4/C cathodes were characterized by charge/discharge cures and electrochemical impedance spectroscopy (EIS). The results show that the LiFePO4/C sample, calcined at 700 °C and contained 3.03% (by mass) carbon, exhibited a highly pure …
Preparation And Methanol Electrooxidation Of Pt/Pmo12/Pedot/Gc Electrodes,
2013
Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), College of Chemistry and Chemical Engineering, Guangxi Normal University, Guilin 541004, Guangxi, China;
Preparation And Methanol Electrooxidation Of Pt/Pmo12/Pedot/Gc Electrodes, Jing-Hua Ma, Rui-Xiang Wang, Yi-Liang Tan, Shan-Shan Wang, Yan-Qin Zhang, You-Jun Fan
Journal of Electrochemistry
Modification of phosphomolybdic acid (PMo12) on poly(3,4-ethylenedioxythiophene) (PEDOT) film (PEDOT/GC) obtained through the electrochemical polymerization was performed using adsorption method (PMo12/PEDOT/GC), followed by electrodepositing Pt on PMo12/PEDOT/GC to prepare Pt/PMo12/PEDOT/GC electrode. Effects of PMo12 and PEDOT on the methanol oxidation performance of electrode were investigated. Results showed that PMo12 obviously changed the morphology and structure of Pt loaded on the electrode, leading to the formation of sharp thorns at the edge of Pt nanostructures. Cyclic voltammetry and chronoamperometry data demonstrated that the catalytic activities of methanol electrooxidation on the Pt/PMo …
The Electrochemical Capacitance Performance Of La1-XSrXCoo3 Perovskites,
2013
1. College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001,China;2. College of Pharmacy, Heilongjiang University of Traditional Chinese Medicine, Harbin 150040, China;
The Electrochemical Capacitance Performance Of La1-XSrXCoo3 Perovskites, Yang Xu, Yan-Yan Bao, Long-Fei Du, Dian-Xue Cao, Gui-Ling Wang
Journal of Electrochemistry
In this paper, the La1-xSrxCoO3 (x = 0.2, 0.4, 0.6, 0.8) perovskites powders were synthesized by a sol-gel method. The perovskite phases were characterized by X-ray diffraction (XRD), while the electrochemical capacitance performance of La1-xSrxCoO3 electrodes in alkaline electrolyte was studied by cyclic voltammetry and galvanostatic charge/discharge test. It was found that the La0.6Sr0.4CoO3 electrode exhibited a specific capacitance of 325 F.g-1 in 6.0 mol.L-1 KOH electrolyte at a current density of 10 mA.cm-2, and the specific capacitance of 315 F.g …
Synthesis And Electrochemical Performance Of Si/C Composite Modified By Pani,
2013
State Key Laboratory for Surface Physics & Chemistry, China Academy of Engineering Physics, Mianyang 621907, Sichuan, China;
Synthesis And Electrochemical Performance Of Si/C Composite Modified By Pani, Guang-Hui Zhang, Pei-Kang Shen, Ge Sang, Ren-Jin Xiong
Journal of Electrochemistry
Silicon/carbon (Si/C) composite materials were prepared through high-energy ball milling and high-temperature solid-phase method, and then coated with thin polyaniline (PAni) film by oxidation. The microstructure and component of the composites were characterized by SEM, XRD, IR, TG, and the electrochemical performance was investigated by cyclic voltammetry (CV) and galvanostatic charge-discharge tests. The results showed that the surface of PAni/Si/G/C composite was coating with complete lamellar structure of PAni film. Its reversible capacity was 784 mAh·g-1 and 690 mAh·g-1 could be maintained after 50th charge-discharge cycles.
Synthesis Of Lifepo4/C Cathode By Sol-Gel And Calcining Method With Chitosan Monomer,
2013
College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China;
Synthesis Of Lifepo4/C Cathode By Sol-Gel And Calcining Method With Chitosan Monomer, Jia Xu, Yan-Yan Wang, Rui Wang, Bo Wang, Yue Pan, Dian-Xue Cao, Gui-Ling Wang
Journal of Electrochemistry
The LiFePO4/C cathode materials for Li-ion battery were synthesized by sol-gel and calcining method using chitosan monomer as a carbon source and a gelating agent. The structures and morphologies were characterized by X-ray diffraction spectroscopy (XRD) and scanning electron microscopy (SEM). The electrochemical performance was investigated by the galvanostatic charge–discharge test. When the molar ratios between chitosan monomer and LiFePO4 were 1:1.2, the LiFePO4/C cathode calcined at 600 oC showed the best performance. The particle sizes ranged 200 ～ 400 nm. The initial discharge capacity of 155 mAh·g-1 was achieved at room temperature …
Current Development Of Quantum Dots Based Electrochemiluminescence Immunosensors,
2013
State Key Laboratory of A nalytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
Current Development Of Quantum Dots Based Electrochemiluminescence Immunosensors, Ling-Ling Li, Qian Lu, Jun-Jie Zhu
Journal of Electrochemistry
Electrochemiluminescence exhibits the merits of both luminescence and electrochemistry analysis, and has been extensively employed in biosensors. Quantum dots are considered one of the three main kinds of electrochemiluminescence luminophores due to their unique properties. This paper briefly reviews the classification and signal amplification technology of quantum dots based electrochemiluminescence immunosensors. Future research trends are also suggested.
Synthesis And Electrocatalysis Of Pdcu Alloy Nanocrystals,
2013
State Key Laboratory of Eleetroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
Synthesis And Electrocatalysis Of Pdcu Alloy Nanocrystals, Hai-Bin Wu, Rui-Zhong Zhang, Wei Chen
Journal of Electrochemistry
Monodispersed PdCu alloy nanoparticles were synthesized by co-reduction of Cu(acac)2 and Pd(acac)2 with 1, 2-hexadecanediol. The spherical and popcorn-like shapes of PdCu alloy nanoparticles were obtained by changing the ratios of mixed surface protecting ligands of 1-octadecene, and oleylamine or oleic acid. TEM and XRD measurements showed that both PdCu nanoparticles are alloy nanocrystals dominated with (111) planes and the average sizes are 12.7 ± 0.18 and 20.4 ± 0.31 nm for he spherical and popcorn-like PdCu nanoparticles, respectively. The electrocatalytic activities of the PdCu nanocrystals for formic acid oxidation were evaluated by electrochemical cyclic voltammetry (CV). The result showed …
Properties Of Carbon Coated Tin Negative Electrode For Lithium-Ion Battery,
2013
School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
Properties Of Carbon Coated Tin Negative Electrode For Lithium-Ion Battery, Gui-Chang Liu, Xiao-Xiao Shen, Li-Da Wang
Journal of Electrochemistry
Carbon coated tin power was prepared by decomposing glucose applying a hydrothermal method, and was further used as the active material for negative electrode of lithium secondary battery. Charge-discharge tests show that the carbon coated tin electrode with the addition of 5 wt.% acetylene black as a conductive agent could obtain an initial discharge capacity of 967 mAh·g-1 and a discharge capacity of 362 mAh·g-1 after 50 cycles, which is much higher than that of tin electrode (166 mAh·g-1 after 50 cycles). The coated carbon hinders the agglomeration of tin powder, reduces the irreversible capacity loss of …
Patent: Dual Function Proteins For Treating Metabolic Disorders,
2013
Novartis Institutes for BioMedical Research
Patent: Dual Function Proteins For Treating Metabolic Disorders, Brian R. Boettcher, Shari L. Caplan, Susan E. Cellitti, Douglas S. Daniels, Norio Hamamatsu, Bernhard Hubert Geierstanger, Stuart Licht, Andreas Loew, Stephen Craig Weldon
Chemistry Faculty Publications
The present invention relates to new proteins comprising fibroblast growth factor 2 1 (FGF21 ) and other metabolic regulators known to improve metabolic profiles in subjects to whom they are administered.
Novel Algorithms And Instrumentation For Vibrational Spectroscopic Methods Of Analysis,
2013
Old Dominion University
Novel Algorithms And Instrumentation For Vibrational Spectroscopic Methods Of Analysis, Mohamed F. Abdelkader
Chemistry & Biochemistry Theses & Dissertations
Raman spectroscopy is a form of vibrational spectroscopy that has been increasingly applied to qualitative analysis of chemicals, explosives, pharmaceuticals, and fuels due to its non-invasive and non-destructive nature; its ease of sampling; and its high molecular specificity. These characteristics of Raman spectroscopy also facilitate its use for both in-line and at-line analysis. The principle limitation of Raman spectroscopy is optical interference arising from both analyte and non-analyte fluorescence. In this dissertation, a solution to this problem is presented in the form of a novel spectrometer design which operates in a sequentially shifted excitation mode to eliminate fluorescence backgrounds, fixed …
Patent: Fusion Proteins For Treating Metabolic Disorders,
2013
Novartis Institutes for BioMedical Research
Patent: Fusion Proteins For Treating Metabolic Disorders, Brian R. Boettcher, Shari L. Caplan, Douglas S. Daniels, Norio Hamamatsu, Stuart Licht, Stephen Craig Weldon
Chemistry Faculty Publications
The invention relates to the identification of fusion proteins comprising polypeptide and protein variants of fibroblast growth factor 21 (FGF21) with improved pharmaceutical properties. Also disclosed are methods for treating FGF21 associated disorders, including metabolic conditions.
Use Of Soybean Lecithin In Shape Controlled Synthesis Of Gold Nanoparticles,
2013
Portland State University
Use Of Soybean Lecithin In Shape Controlled Synthesis Of Gold Nanoparticles, Benjamin Robert Ayres
Dissertations and Theses
The work presented in this dissertation is a composite of experiments in the growth of gold nanoparticles with specific optical properties of interest. The goal is to synthesize these gold nanoparticles using soybean extract for not only shape control, but for propensity as a biocompatible delivery system. The optical properties of these nanoparticles has found great application in coloring glass during the Roman empire and, over the centuries, has grown into its own research field in applications of nanoparticulate materials. Many of the current functions include use in biological systems as biosensors and therapeutic applications, thus making biocompatibility a necessity. …
Density Functional Theory And The Calculation Of Tcmg2O4 Spinel Lattice Parameters,
2013
California Polytechnic State University - San Luis Obispo
Density Functional Theory And The Calculation Of Tcmg2O4 Spinel Lattice Parameters, Jon Karlo Macias
Physics
The cohesive energy, lattice constant and bulk modulus of two simple HCP crystal structures of magnesium and technetium were calculated using the vienna ab initio simulation package (VASP) which is based on density functional theory (DFT). The same properties were determined for TcMg2O4 spinel. The theoretical results of the lattice constant of the pure crystals were compared to experimental results and found to be in excellent agreement with a difference of less than 2%. The results for the lattice constant of the TcMg2O4 spinel were found to be in excellent agreement as well with …
Physical Essentials Of Rotating Complex Impedance Diagram In Some Electrochemical Systems,
2013
College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China;
Physical Essentials Of Rotating Complex Impedance Diagram In Some Electrochemical Systems, Bing-Liang Wu
Journal of Electrochemistry
The essential of the rotation of complex impedance diagram in some electrochemical systems is discussed. It is attributing to that the electrochemical capacitance usual is not simple real capacitor but must be complex number capacitance. As the examples: 1, the metal/support electrolyte electrode in the ideal polarization condition, the capacitance must be that of the electrochemical double layer and represents complex number properties. Its complex impedance diagram was not a line parallel to imaginary axis but rotated clockwise α=arctgC"/C'. 2, In the case of insertion/desertion electrodes, the capacitance must be that of the solid electrolyte interphase (SEI). The rotation of …
Combination And Applications Of Time-Resolved Surface Plasmon Resonance Spectroscopy And Electrochemical Methods,
2013
State Key Laboratory of Electroanalytical Chemistry, Engineering Laboratory for Modern A nalytical Techniques, Changchun Institute of A pplied Chemistry, Changchun 130022, China;
Combination And Applications Of Time-Resolved Surface Plasmon Resonance Spectroscopy And Electrochemical Methods, Yu Bao, Yan Mao, Wei Wang, Zheng-Gang Li, Li Niu
Journal of Electrochemistry
Electrochemical-surface plasmon resonance (EC-SPR) technique, developed in recent years, is a new technology which combines time-resolved surface plasmon resonance spectroscopy and electrochemical methods. Surface plasmon resonance (SPR) is a physical phenomenon generated by optical coupling using a metallic thin film and is very sensitive to optical analysis. The principles of SPR and EC-SPR are briefly introduced and the applications of the combination of SPR spectroscopy with electrochemical techniques are reviewed in this paper. This new technology has been widely used in such research areas as reaction dynamics, biochemical sensors, electrode/electrolyte interfaces, kinetic parameters and bimolecular interactions.
High Performance Membrane Electrode Assembly With Low Platinum Loadings Prepared By Atomic Layer Deposition For Pemfc Application,
2013
School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China;
High Performance Membrane Electrode Assembly With Low Platinum Loadings Prepared By Atomic Layer Deposition For Pemfc Application, Ting Shu, Shi-Jun Liao, Chien-Te Hsieh, Ay Su
Journal of Electrochemistry
A high performance membrane electrode assembly (MEA) with low platinum loadings was successfully prepared with atomic layer deposition (ALD) technique. The anode of the MEA was prepared by depositing platinum on the carbon paper substrate, which was prepared by coating the slurry of carbon black (XC-72R) and Teflon, followed by drying and calcining at 350 °C. The MEAs consisted of the ALD anode or commercial catalyst anode, pretreated Nafion membrane (Nafion-117) and commercial cathode. Performances of MEAs were measured by single cell testing, and the anodes and MEAs were characterized by CV, SEM, TEM and XRD. The results revealed that …
Electrochemical Performance Of Fe3O4/C Composites As Negative Material For Lithium-Ion Batteries,
2013
State Key Laboratory of optoeleetronic Materials and Technologies, Guangdong Province Key Laboratory of Lou-carbon Chemistry & Energy Conservation, School of Physics and Engineering, Sun Yat-sen University,Guangzhou 510275, China
Electrochemical Performance Of Fe3O4/C Composites As Negative Material For Lithium-Ion Batteries, Jun-Jie Cai, Shu Yao, Ze-Sheng Li, Hui Meng, Pei-Kang Shen
Journal of Electrochemistry
The Fe3O4/Carbon composites have been synthesized through coprecipitation pathway and by insitu aniline polymerization as a carbon source. Structural characterization and morphological study of the composites were investigated by using XRD, SEM and TEM techniques. The results showed that the nanosized Fe3O4 particles (40 ~ 80 nm) were encapsulated in the amorphous carbon. During the electrochemical tests, the Fe3O4/C composites exhibited high capaticity and excellent cycle ability, the retention of capaticity was about 1000 mAh·g-1 after 30 cycles of charge/discharge tests at 50 mA·g-1.
A Comparative Study Of Charge-Discharge Behaviors Of α-Pbo2 And β-Pbo2 Cathodes,
2013
School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China;
A Comparative Study Of Charge-Discharge Behaviors Of α-Pbo2 And β-Pbo2 Cathodes, Cong-Ying Cui, Xue-Mei Ma, De-Long Kong, Hou-Yi Ma
Journal of Electrochemistry
The α-PbO2 and β-PbO2 powders were prepared using simple chemical synthetic methods, and their crystalline structures and surface morphologies were characterized with X-ray powder diffraction spectroscopy and scanning electron microscopy. Using the as-synthesized α-PbO2 and β-PbO2 powders as positive active materials, the electrochemical performance of the two PbO2 materials was investigated by means of cyclic voltammetry, galvanostatic charge-discharge tests, and electrochemical impedance spectroscopy. The results indicate that the discharge capacity of α-PbO2 electrode is larger than that of β-PbO2; moreover, the composite electrodes made by α-PbO2 and β-PbO2 mixtures with …
An In Situ Ftir Spectroelectrochemical Study On Methanol Oxidation At Pt-Mo2C/Gc Catalyst,
2013
State Key Laboratory of Optoelectronic Materials and Technologies, Key Laboratory ofLow-carbon Chemistry&: Energy Conservation of Guangdong Province, Sehool of Physics and Engineering, Sun Yat-sen University, Guangzhou 510275, China
An In Situ Ftir Spectroelectrochemical Study On Methanol Oxidation At Pt-Mo2C/Gc Catalyst, Hai-Ping Huang, Xi-Yu Yao, Pei-Kang Shen
Journal of Electrochemistry
A 40% Pt on Mo2C/GC catalyst has been prepared by ion exchange method. The mechanism of methanol electrooxidation on Pt-Mo2C/GC and commercial Pt/C catalysts in acidic media was studied by cyclic voltammetry, XRD measurements and in-situ Fourier transform infrared spectroelectrochemistry. The results revealed that the Pt nanoparticles were uniformly dispersed on Mo2C/GC with an average particle size of 3 nm. The cyclic voltammetric and chronopotentiometric experiments indicated that Pt-Mo2C/GC catalyst exhibited a better performance for methanol oxidation than that of Pt/C in acid solution. A negative shift over 90 mV of the …
