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 …
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.
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 …
Electrochemical Synthesis Of Hierarchical Dendritic Polyaniline Nanostructures,
2013
Department of Pharmaceutical Analysis, Faculty of Pharmacy, Fujian Medical University, Fuzhou 350004, China
Electrochemical Synthesis Of Hierarchical Dendritic Polyaniline Nanostructures, Shao-Huang Weng, Jian-Zhang Zhou, Zhong-Hua Lin, Xin-Hua Lin
Journal of Electrochemistry
In this work, the p-TSA doped and hierarchical dendritic nanostructured polyanilines (PANI) have been prepared by potentiostatic electropolymerization without using any templates at room temperature. The mechanism of the polymerization has been discussed according to the electrodeposition curves. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were employed to confirm the formation of uniform hierarchical dendritic structure on PANI. UV-Vis spectroscopy (UV-Vis) and infrared spectroscopy (FTIR) proved that the prepared PANI is in the form of emeraldine salt. The templateless electrodeposition method is simple, easy to operate, can be applied to fabricate other nanostructures of conducting polymers.
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, …
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 …
A Comparative Study Of Ce3+/Ce4+ Redox Couple On Pt Electrode In Sulfuric Acid And Methanesulfonic Acid,
2013
State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, China;
A Comparative Study Of Ce3+/Ce4+ Redox Couple On Pt Electrode In Sulfuric Acid And Methanesulfonic Acid, Zhao-Hua Li, You-Qun Chu, Chun-An Ma
Journal of Electrochemistry
The electrochemical oxidations of Ce3+ to Ce4+ on Pt rotating disk electrode (RDE) in both sulfuric acid and methanesulfonic acid (MSA) solutions were studied by using cyclic voltammetry and linear sweep voltammetry. The complexing behaviors of Ce3+/Ce4+ were preliminarily probed and the exchange current density, diffusion coefficient, as well as reaction rate constant were obtained from Butler-Volmer equation. The activation energies of Ce3+ oxidation on Pt electrode in two types of acidic media, obtained from Arrhenius equation, were also compared. The results indicate that Ce3+ can be oxidized to Ce4+ much easier in …
Fabrication And Localized Surface Plasmon Resonance Of Ultrathin Nanoporous Gold Films,
2013
Department of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
Fabrication And Localized Surface Plasmon Resonance Of Ultrathin Nanoporous Gold Films, Shi Feng, Shu Chen, Qing Yang, Juan Xiang
Journal of Electrochemistry
Ultrathin nanoporous gold films (NPGF) with a thickness of approximately 50 nm were fabricated via electrochemical dealloy method. The morphology of NPGF was evaluated with a parameter of surface roughness. SEM results demonstrate that the fabrication of NPGF with different roughness factors can be achieved by controlling the circles of cyclic voltammetry. UV-Vis spectra indicate that the localized surface plasmon resonance (LSPR) of NPGF is affected by the roughness of NPGF. With the optimal roughness factor, NPGF displays a linear relationship between the ethanediol concentration and the absorbance intensity at λ = 450 nm. The LSPR effect of NPGF presents …
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.
Analysis Of The Material Factors In The Degradation Of Sofc Performance,
2013
School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China
Analysis Of The Material Factors In The Degradation Of Sofc Performance, Ke-Qing Gao, Xiao-Tian Liu, Qing Zhao, Li-Quan Fan, Yue-Ping Xiong
Journal of Electrochemistry
Based on the cell operating conditions, the material factors which influence the cell performance of SOFC including the chemical stability of materials at solid-gas interface in redox atmosphere, the diffusion and reaction between the interface of solid-solid materials, and degradation caused by the external chemical substances brought into the cells at triple phase boundary are mainly analyzed. Given that under the current state of the research it is urgent to explore the material factors on degradation of cell performance to meet demands in SOFC applications.
Electrochemical Activities Of Oxygen-Doped Carbon Surface For V(Iv)/V(V) Redox Couple,
2013
State Key Lab of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
Electrochemical Activities Of Oxygen-Doped Carbon Surface For V(Iv)/V(V) Redox Couple, Huan Zhang, Lin-Lin Qin, Yi-Ning Shi, Ming-Sen Zheng, Quan-Feng Dong, Zhao-Wu Tian
Journal of Electrochemistry
Graphite plate electrodes were treated with oxygen plasma and doped with oxygen as well as oxygen functional groups. With the treatment, the activities of graphite plate electrodes toward VO2+/VO2+ redox reactions were improved. FT-IR and EDS analysis results indicated that oxygen functional groups were introduced to the surface of graphite plates after oxygen plasma treatment. In this paper, the graphite plate treated for 20 min showed the highest activity. The average charge efficiency reached 91%, suggesting an increase of 19%, compared with that of the untreated graphite plate under a current density of 8 mA·cm-2 …
Synthesis And Functionalization Of Small Silver Nanoparticles,
2013
Department of Chemistry, Boise State University
Synthesis And Functionalization Of Small Silver Nanoparticles, Chris Menter, Jeunghoon Lee, Sarah Rhen, Elton Graugnard, Bernard Yurke, William Knowlton, Will Hughes, Wan Kuang
College of Arts and Sciences Poster Presentations
Metal nanoparticles in general exhibit interesting properties due to their small sizes. This response shows up as an intense absorption band in the visible region making metallic nanoparticles ideal probes for medical imaging as well as for countless other applications. Functionalizing metallic nanoparticles with DNA enables targeted labeling, controlled by their base sequence. Another purpose of functionalization is to attach the nanoparticle to a DNA substrate allowing controlled bottom up engineering of nanoscale devices. Gold or gold-encapsulated silver is usually used for these purposes instead of bare silver due to the ease with which silver is oxidized although silver nanoparticles …
Comparison Of Two Methods Of Monitoring Corn Mash At Corn Plus Ethanol Plant,
2013
University of Minnesota - Morris
Comparison Of Two Methods Of Monitoring Corn Mash At Corn Plus Ethanol Plant, Lanay Walker
Undergraduate Research Symposium 2013
In the ethanol industry, several variables affect the amount and grade of ethanol that is produced which affects a plant’s ability to make a profit. This research is focused on one of those variables, ‘corn mash solid content’, which must be closely monitored before the fermentation step. If the mash out of the mix tank is the wrong consistency, the alpha-amylase and gluco-amylase enzymes will not efficiently break the starch into simple sugars that yeast can consume which will decrease the amount of ethanol produced. The mash solid and moisture content is measured daily in order to ensure that the …
Dielectric Properties Of Polymer–Particle Nanocomposites Influenced By Electronic Nature Of Filler Surfaces,
2013
Missouri University of Science and Technology
Dielectric Properties Of Polymer–Particle Nanocomposites Influenced By Electronic Nature Of Filler Surfaces, Sasidhar Siddabattuni, Thomas P. Schuman, Fatih Dogan
Materials Science and Engineering Faculty Research & Creative Works
The interface between the polymer and the particle has a critical role in altering the properties of a composite dielectric. Polymer-ceramic nanocomposites are promising dielectric materials for many electronic and power devices, combining the high dielectric constant of ceramic particles with the high dielectric breakdown strength of a polymer. Self-assembled monolayers of electron rich or electron poor organophosphate coupling groups were applied to affect the filler–polymer interface and investigate the role of this interface on composite behavior. The interface has potential to influence dielectric properties, in particular the leakage and breakdown resistance. The composite films synthesized from the modified filler …
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 …
