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Articles 1 - 30 of 78
Full-Text Articles in Physical Chemistry
Stable Isotope Compositions Of Sedimentary Organic Matter Off Zanzibar Town, Ann Muzuka
Stable Isotope Compositions Of Sedimentary Organic Matter Off Zanzibar Town, Ann Muzuka
Tanzania Journal of Science
Stable isotope compositions of sedimentary organic carbon for sediments collected off the Zanzibar Town averaged -17.9%. Low isotope values of organic carbon, which were associated with high C/N ratios, were observed within Zanzibar harbour suggesting a significant contribution of terrestrial organic matter to the harbour. Sediments collected outside the Zanzibar harbour were richer in 13C than those collected within the harbour area. This 13 enrichment in 13C can be attributed to a decrease in the influence of terrestrial organic matter (0M) and high contribution of' sea grasses. A decrease in the influence of terrestrial OM is further supported …
Synthesis Of Bis-(3-Carbethoxy-6-Methoxy-4-Methyl-2-Quinolyl) Selenide, Rr Malisa, G L. Mhehe, Sjm Mdachi
Synthesis Of Bis-(3-Carbethoxy-6-Methoxy-4-Methyl-2-Quinolyl) Selenide, Rr Malisa, G L. Mhehe, Sjm Mdachi
Tanzania Journal of Science
In the execution of a synthetic strategy aiming at 3-acetyl-2,4-dichloro-6-methoxyquinoline, a precursor to a 4-methoyselenolo[2,3-b]quinolone, we have instead obtained 2-chloro-3-carbethoxy-6-methoxy-4-methylquinoline. These results strongly suggest that the compound claimed to be 3-acetyl-2,4-dihydroxy-6-methoxyquinoline in the literature and a precursor to 3-actyl-2,4-dichloro-6-methoxyquinoline, is 3-carbethoxy-2-hydroxy-6-methoxy-4-methylquinoline, a precursor to 2-chlo-3-carbethoy-6-methoxy-4-methylquinoline. The reaction of the latter compound with sodium hydrogen selenide in ethanol yielded bis-(3-carbethoxy-6-methoxy-4-methyl-2-quinolyl) selenide.
Surface Enhanced Raman Spectroscopic Study Of Scn- Adsorbed At The Copper And Gold Nanowire Arrays, Jian-Lin Yao, Guo-Ping Pan, Kuan-Hong Xue, Yong Xie, Jing Tang, Bin Ren, Dong-Mei Sun, Bing-Wei Mao, Zhong-Qun Tian
Surface Enhanced Raman Spectroscopic Study Of Scn- Adsorbed At The Copper And Gold Nanowire Arrays, Jian-Lin Yao, Guo-Ping Pan, Kuan-Hong Xue, Yong Xie, Jing Tang, Bin Ren, Dong-Mei Sun, Bing-Wei Mao, Zhong-Qun Tian
Journal of Electrochemistry
Two-dimensional arrays of Cu and Au nanowires have been fabricated by template synthesis method, using the anodic aluminum oxidation films as the template. The morphology of the nanowire array was monitored by atomic force microscope (AFM) in the dissolution processes of the alumina film. Based on the probe molecule strategy, the spectral feature of SCN- adsorbed at the Cu and Au nanowires with different diameters has been investigated by surface enhanced Raman spectroscopy (SERS). The results reveal that the intensity of the SERS bands depends on the length of the exposed nanowires. The C≡N stretching vibration frequency (νCN …
The Electrochemical Behaviors Of Superoxide Dismutase At Promoter Modified Gold Electrode, Xia-Qin Wu, Xiao-Yun Meng, Zhe-Su Wang, Zong-Rang Zhang
The Electrochemical Behaviors Of Superoxide Dismutase At Promoter Modified Gold Electrode, Xia-Qin Wu, Xiao-Yun Meng, Zhe-Su Wang, Zong-Rang Zhang
Journal of Electrochemistry
The electron-transfer process of superoxide dismutase was investigated by cyclic voltammetry at the 4,4'-dithiodipyridine, L-cysteine, histidine and arginine modified gold wire electrodes repectively. The quasi-reversible behavior was observed at L-cysteine modified gold electrode. An irreversible electrochemical behavior has been observed at hisdinine modified gold wire electrode.
A Gas Analysis Method For Determining The Perchlorate Current Efficiency And Other Applications, Zhi-Gang Shao, Bao-Lian Yi
A Gas Analysis Method For Determining The Perchlorate Current Efficiency And Other Applications, Zhi-Gang Shao, Bao-Lian Yi
Journal of Electrochemistry
A method for determining the current efficiency by means of measuring the flow capacity of the cell gas in a perchlorate cell has been proposed. The perchlorate cell system was equipped with an oxygen cathode or a Na+ ion exchange membrane. This method is simple and convenient as well as accurate in the evaluation of the perchlorate current efficiency in the perchlorate cell as compared with the traditional methods of analysis. It is useful in the investigation of electrochemical problems with high perchlorate concentration, as well as for the assessment of electrocatalytic performance of anode materials.With an oxygen cathode …
Electrochemical Studies Of Metal Complexes In Solution, Ye-Xiang Tong, Bei-Sheng Kang, Qi-Qin Yang
Electrochemical Studies Of Metal Complexes In Solution, Ye-Xiang Tong, Bei-Sheng Kang, Qi-Qin Yang
Journal of Electrochemistry
The prospectus of electrochemical studies of metal complexes in solution have been introduced as a background of our research work. The electrochemical behaviors of the metal complexes and clusters have been investigated by many kinds of electrochemical methods. The content includes the standard electrode potential and the related equilibrium constant, electrochemical kinetics and the related behavior of structure, electrocatalysis and electrosynthesis of metal complexes. The electrode reaction mechanisms of the complexes have been approached. The methods for measuring some thermodynamic and kinetic parameters of the complexes are also given. Electrochemical studies would provid many kinds of important information for studying …
Electro-Oxidation Of Phenol On Sno2/Ti Electrodes Prepared By Thermal Oxidation, Qing-Song Zhang, Hui-Huang Wu
Electro-Oxidation Of Phenol On Sno2/Ti Electrodes Prepared By Thermal Oxidation, Qing-Song Zhang, Hui-Huang Wu
Journal of Electrochemistry
A SnO2/Ti electrode prepared by thermal oxidation was used as the anode for galvanostatic electrolysis in acidic solution containing phenol, the time-dependances of phenol concentration, chemical oxygen demand in solution(COD) and instantaneous current efficiency were determined during electrolysis. The results show that with the SnO2/Ti anode instead of Pt, the COD significantly decreases at the same charge passage, and average current efficiency of oxidation increases by three times. The mechanism for phenol oxidation at two electrodes was discussed.
Prparation Of Nanocrystaline Tio2(Anatase) With High Thermal And Textural Sability By Electrochemical Method, Dao-Bao Chu, Xing-Fu Zhou, Chang-Jian Lin, Jian-Guang Tang
Prparation Of Nanocrystaline Tio2(Anatase) With High Thermal And Textural Sability By Electrochemical Method, Dao-Bao Chu, Xing-Fu Zhou, Chang-Jian Lin, Jian-Guang Tang
Journal of Electrochemistry
Titanium alkoxides were prepared by anodic dissolution of metallic titanium in absolute ethanol in the presence of HN(C2H5)2·HCl (electro-conductive additives). The solution was directly hydrolyzed to prepare nanocrystalline of TiO2 (about 10nm)by a sol-gel process. The precursor gels was calcined at T =450 ℃ and 720 ℃ for 30 min, and nanocrystalline of TiO2 (anatase) with high textural and thermal stability was obtained. FTIR, XRD, TEM were used to characterize the structure of titanium alkoxides and nanocrystalline of TiO2. The characteristics of nanocrystalline of TiO2 was depended on the …
The Studies Of The (Photo) Electrochemical Character On The Electrodeposited Silver Indium Selenium Thin Films, Shao-Ai Xie, Xun-Nan Deng, You-Jin Kua
The Studies Of The (Photo) Electrochemical Character On The Electrodeposited Silver Indium Selenium Thin Films, Shao-Ai Xie, Xun-Nan Deng, You-Jin Kua
Journal of Electrochemistry
A photoelectrochemical cell (PEC) is constructed, using an AgInSe2 film photoanode made from electrodeposition and a platinium electrode in aqueous polyiodide or polysufide electrolyte. The Voc and Isc of PEC have been tested and measured, and the effect of chemical decoration on the photoanodes also studied.
Studies On Methods Of Fuel Cells Electrodes Preparation, Jun Gu, Sheng Sui, Guang-Qiang Li, Zhitong Sui
Studies On Methods Of Fuel Cells Electrodes Preparation, Jun Gu, Sheng Sui, Guang-Qiang Li, Zhitong Sui
Journal of Electrochemistry
In fuel cells, the structure of electrodes is an important factor which effect the cell performance. To improve the structure and the performance of electrodes, a new method of providing fuel cell electrodes is proposed in this paper. PTFE (polytetrafluoroethylene) and ethyne black was ground for about half an hour in a high-speed grinder, then the catalyst was added into the grinder and milled for an hour. This milled catalyst was transferred into a mixer followed by the addition of surface-active agent. After a suspension was formed, it was filtered under vacuum condition.Then a thin uniform filter-cake of the catalyst …
Aes Multi-Layer Structural Analysis Of Si Based Anodic Porous Alumina Films And Studies On Its Formation Mechanism, Jun-Hui Wu, Jian-Ping Zou, Qing Zhu, Xi-Mao Bao
Aes Multi-Layer Structural Analysis Of Si Based Anodic Porous Alumina Films And Studies On Its Formation Mechanism, Jun-Hui Wu, Jian-Ping Zou, Qing Zhu, Xi-Mao Bao
Journal of Electrochemistry
400 nm aluminum films were deposited onto a p-type, 0.5 Ω·cm,〈100〉oriented silicon wafers using electron beam evaporation technique. Then, the wafers was immersed in 15 wt% H2SO4 for porous-type over-anodization under a constant voltage of DC 60V. During the anodization,the temperature of the electrolyte was maintained at 0 ℃. The obtained samples were investigated by means of transmission electron microscopy, scanning electron microscopy, and AES depth profile for multi-layer structural information. In addition, the basic anodic formation mechanism of the Si-based aluminum films was brielfly discussed.
Study On Electrochemical Reduction Properties Of Nitrobenzene, Chu-Na Ma, Wen-Kui Zhang, Hui Huang, Yong-Ping Gan
Study On Electrochemical Reduction Properties Of Nitrobenzene, Chu-Na Ma, Wen-Kui Zhang, Hui Huang, Yong-Ping Gan
Journal of Electrochemistry
The electrochemical reduction characteristics of nitrobenzene was extensively investigated by using the techniques such as quasi-steady-state polarization, cyclic voltammetry, fast linear potential sweep method and chronoamperometry in this paper. The electroanalytic properties of Cu, Cu-Hg and Cu-Ni electrodes were evaluated. Based on the study of the transient steping behaviour of nitrobenzene to PAP, the reduction mechanism was discussed. The results showed that the transition steps existed on the electrochemical reduction of nitrobenzene in acidic solution, the reactant is also absorbed on electrodes surface. The control step in the reduction of nitrobenzene was ascribed to the diffusion of nitrobenzene and its …
A Novel Reaction Region Moving Electrode System For Electrochemical Power Sources, Jin-Kua You, Que Tu, Zheng-Jian Wang, Jie Sun, Zu-Geng Lin
A Novel Reaction Region Moving Electrode System For Electrochemical Power Sources, Jin-Kua You, Que Tu, Zheng-Jian Wang, Jie Sun, Zu-Geng Lin
Journal of Electrochemistry
In most of practical rechargeable batteries, charging/discharging process is always concerned with phase-transformation in the solid state. Due to the irreversibility of the phase-transformation, the cyclic performance of the rechargeable batteries are limited. In this paper, a novel reaction-region moving counter electrode system is constructed in our laboratory. The electrode system is operated at room temperature and cycled in solid-liquid phase during charging/discharging processes. With this electrode, the metal-complexes are firstly deposited (i.e. charging process) on the nearest working electrode and gradually extended to those another working electrodes several centimeters away from the counter electrode. The deposite is dissolved again …
High Performance Proton Exchange Membrane Fuel Cells, Jing-Rong Yu, Bao-Lian Yi, Ming Han, Xiao-Liang Cheng, Zhi-Gang Shao, Jing-Xin Zhang
High Performance Proton Exchange Membrane Fuel Cells, Jing-Rong Yu, Bao-Lian Yi, Ming Han, Xiao-Liang Cheng, Zhi-Gang Shao, Jing-Xin Zhang
Journal of Electrochemistry
Proton-exchange membrane fuel cells(PEMFC) using a perfluorosulfonic acid proton exchange membrane as an electrolyte can simplify water and electrolyte management. In this paper, the effects of thickness of PEM on the performance of PEMFC were studied. The Nafion-112 PEM and low platinum loading E-TEK electrode yielded very high power density, of the order of 0.95 W/cm2. The energy-conversion efficiency, the degree of platinum utilization and stability for PEMFC using Nafion 112 and E-TEK electrode were also investigated.
Photoelectrochemical Studies On The Tio2 Nanostructured Porous Film Sensitized By Cyanine Dye, Li Zhang, Mai-Zhi Yang, Xue-Bin Qiao, Yan-Zhong Hao, En-Qing Gao, Sheng-Min Cai
Photoelectrochemical Studies On The Tio2 Nanostructured Porous Film Sensitized By Cyanine Dye, Li Zhang, Mai-Zhi Yang, Xue-Bin Qiao, Yan-Zhong Hao, En-Qing Gao, Sheng-Min Cai
Journal of Electrochemistry
The photoelectrochemical behaviors of the TiO2 nanostructured porous film sensitized by cyanine dye were investigated in this paper. The results showed that the excitaed state level matched the conduction band edge of TiO2 nanoparticle. Therefore the sensitization of the dye can increase the photocurrent intensity of the TiO2 nanostructured electrode obviously and results in a red-shift of optical absorption from the ultra-violet region to the visible. As a result, the light-to-electricity conversion efficiency was improved evidently, the maximum value of IPCE has reached 12.1%.
Characterization And Electrochemical Behaviour Of Ce(Ⅲ) Amino Acid Imidazole Ternary Complexes, Hui-Xia Wu, Ze-Min Wang, Hai-Feng Yang, Zong-Rang Zhang
Characterization And Electrochemical Behaviour Of Ce(Ⅲ) Amino Acid Imidazole Ternary Complexes, Hui-Xia Wu, Ze-Min Wang, Hai-Feng Yang, Zong-Rang Zhang
Journal of Electrochemistry
Two Ce(Ⅲ)-amino acid-imidazole teranry complexe were synthesized,These complexes have the composition of Ce(Trp)3IM(NO3)3·3H2O and Ce(Phe)3IM(NO3)3 respectively. The IR spectra indicate that the carboxy group of amino-acid and the N atoms of imidazole are coordinated with Ce(Ⅲ) ion. Cyclic voltammetry was used to study the electrochemical behaviour of Ce(Ⅲ) ion, the mixture of Ce(Ⅲ) with ligands, and Ce(Ⅲ) binary or ternary complexes. Within the scan range of -0.1 to 1.10 V (vs.SCE), both of ternary complexes depicted completely irreversible electron transfer process.
Investigation Of Sodium Hypophosphite Anodic Oxidizing Behavior In The Process Of Acid Electroless Nickel Deposition, Mei-Yuan Wang, Ya-Fei Kuang, Yan Xu
Investigation Of Sodium Hypophosphite Anodic Oxidizing Behavior In The Process Of Acid Electroless Nickel Deposition, Mei-Yuan Wang, Ya-Fei Kuang, Yan Xu
Journal of Electrochemistry
The anodic oxidizing behavior of sodium hypophosphite in the process of electroless nickle deposition (pH=5.5) was investigated with the linear potential sweep method and alternating current impedance. The results indicated that, the oxidation of NaH2PO2 was a complicated electrochemical process and affected by the concentration of NaH2PO2, the temperature of the bath, the sweep rate and the existence of nickel ion. The NaH2PO2 electrooxidation reaction was very likely preceded by heterogeneous interface transformation process, which might be the control step of the whole anodic process.
The Preparation Of Flexible Polymeric Anode And The Measurement Of Its Protective Ability For Cathodic Protection, Ai-Ling Du, He-Ming Zhang, Ming-Zong Zhang, Shi-De Ma
The Preparation Of Flexible Polymeric Anode And The Measurement Of Its Protective Ability For Cathodic Protection, Ai-Ling Du, He-Ming Zhang, Ming-Zong Zhang, Shi-De Ma
Journal of Electrochemistry
The flexible electrode, whose shape can be changed freely, was made of ethenyl copolymer and conductive component and proper amount of additive for cathodic protection. The resistance of electrode was measured.In low concentration of H2SO4, the flexible electrode can be used as auxiliary anode to protect the carbon steel. The protection ability of the flexible auxiliary anode was measured too.
Studies Of The Electrode Preparation Of Electrode From Lead Carbonate For Lead Acid Batteryⅰ. The Activation Of The Pme, Zhong-Xu Dai, Di-Hua Wang, Jun-Wei Jiang, Yun-Hong Zhou, Jin-Yun Zou
Studies Of The Electrode Preparation Of Electrode From Lead Carbonate For Lead Acid Batteryⅰ. The Activation Of The Pme, Zhong-Xu Dai, Di-Hua Wang, Jun-Wei Jiang, Yun-Hong Zhou, Jin-Yun Zou
Journal of Electrochemistry
Lead carbonate which was an intermediate product in lead hydrometallurgy without pollution of lead vapor and sulfur dioxide was selected as electrode material of lead-acid batteries. In the present work, the performances of PbO2/PbSO4 or PbSO4/Pb electrode transformed from PbCO3 have been investigated by powder microelectrode technique combined with cyclic voltammetry. The results show that the CV characteristics of either negative or positive electrode prepared from PbCO3 is as good as that of both electrodes made from lead oxide produced by mill machine,when a powder microelectrode with PbCO3 transformed into PbSO 4 …
Validity Of The Independent-Particle Approximation In X-Ray Photoemission: The Exception, Not The Rule, D. Hansen, Oliver Hemmers, H. Wang, Dennis W. Lindle, P. Focke, I. A. Sellin, Clemens Heske, H. S. Chakraborty, P. C. Deshmukh, S. T. Manson
Validity Of The Independent-Particle Approximation In X-Ray Photoemission: The Exception, Not The Rule, D. Hansen, Oliver Hemmers, H. Wang, Dennis W. Lindle, P. Focke, I. A. Sellin, Clemens Heske, H. S. Chakraborty, P. C. Deshmukh, S. T. Manson
Environmental Studies Faculty Publications
A combined experimental and theoretical study of argon valence photoionization illustrates the discovery of the broad lack of validity of the independent-particle approximation (IPA) for x-ray photoemission. In addition to previously known breakdowns of the IPA, which are limited to high photon energies and regions very near threshold, the observed breakdown in photoionization at intermediate energies demonstrates generally that the IPA is valid only in very restricted domains. These restrictions are expected to be relevant throughout the periodic table, with consequences for a wide variety of applications.
A New Method For Preparing Self-Assembled Lipid Bilayers On Pt Electrode, Peng Diao, Dian-Lu Jiang, Xiao-Li Cui, Deng-Ping Gu, Ru-Ting Tong
A New Method For Preparing Self-Assembled Lipid Bilayers On Pt Electrode, Peng Diao, Dian-Lu Jiang, Xiao-Li Cui, Deng-Ping Gu, Ru-Ting Tong
Journal of Electrochemistry
A new method for preparing Pt-supported bilayer lipid membrane (Pt-BLM) on Pt electrode cleaned by high power ultrasound was reported. The reported method was convenient, costing less platinum and could be used to form large-area Pt-BLM as compared with the traditional Pt-wire-cutting method. The electrical properties of Pt-BLM were studied using electrochemical impedance spectroscopy and cyclic voltammetry. Experimental results showed that the values of membrane capacitance and the voltammetric characteristics were consistent with those of Pt-BLM prepared by traditional method.
The Electrochemical Apparent Effective Thickness Of Alkanethiol Self-Assembled Monolayers, Xiao-Li Cui, Dian-Lu Jiang, Peng Diao, Jun-Xin Li, Ru-Ting Tong, Deng-Ping Gu, Xin-Kui Wang
The Electrochemical Apparent Effective Thickness Of Alkanethiol Self-Assembled Monolayers, Xiao-Li Cui, Dian-Lu Jiang, Peng Diao, Jun-Xin Li, Ru-Ting Tong, Deng-Ping Gu, Xin-Kui Wang
Journal of Electrochemistry
The electrochemical behavior of octadecanethiol self-assembled monolayers modified gold electrode in different concentration of Fe(CN)63-/4- is investigated by cyclic voltammetry and electrochemical impedance spectroscopy. It is determined that the apparent he-terogeneous rate constant ks is in the order of 10-6 cm·s-1, the apparent electron transfer coefficients are 0.15 and 0.22. The apparent effective thickness of the SAMs is established which can be used to describe the molecular ordering degree of self-assembled monolayers.
Direct Electrolysis Of Seawater On Conducting Film For Microbial Anticorrosion 1. Simulation And Measurement Technique, Wei-Ling Hu, Ling-Ling Wu, Jing Zhou, Jing-Xin Li, Jin Luo, Zhong-Hua Lin
Direct Electrolysis Of Seawater On Conducting Film For Microbial Anticorrosion 1. Simulation And Measurement Technique, Wei-Ling Hu, Ling-Ling Wu, Jing Zhou, Jing-Xin Li, Jin Luo, Zhong-Hua Lin
Journal of Electrochemistry
Based on the electrochemical micro probe and the weak signal detection technique, simulated test and measurement system were set up by the use of four-electrode cell(including a micro electrode), bipotentiostat, lock-in amplifier and three-dimensional micro manipulating device. Based on the system, the micrometer scale concentration distribution of trace hypochlorite, which is produced by direct electrolysis of seawater on the conducting film for preventing microbial corrosion has been obtained for the first time. Both relationships between concentration of hypochlorite and its reduction current, which is termed an working curve, and between the reduction current of hypochlorite and measured time are reported.
Electrochemical Synthesis Of Fes Electrode And Its Behavior Measurement, Cong-Sheng Guan
Electrochemical Synthesis Of Fes Electrode And Its Behavior Measurement, Cong-Sheng Guan
Journal of Electrochemistry
The Potential for the electrochemical synthesis of FeS electrode has been obtained by cyclic voltammetry. FeS electrodes were synthesiaed by controlling Fe electrode at -1.0 V in LiCl-KCl-Li2S and Li(FClI)-Li2S melts and their behavior were measured also. The FeS electrode synthesized in molten Li(FClI)-Li2S has the best charge and discharge properties.
Studies On The Inclusion Complexes Of Rhein With Cds By Oscilloscope Polarography, Xiang-Jun Li, Jun Lian, Yong Zhang, Jing-Hao Pan
Studies On The Inclusion Complexes Of Rhein With Cds By Oscilloscope Polarography, Xiang-Jun Li, Jun Lian, Yong Zhang, Jing-Hao Pan
Journal of Electrochemistry
Inclusion action of rhein with CDs was studied by linear sweep oscilloscope polarography. The molar ratio of inclusion complexes of rhein with CDs are 1:1, the inclusion constants in different temperature have been determined and the thermodynamics parameter of some inclusion complexes have also been obtained. It indicates that in normal temperature, the inclusion procedure go on spontaneously, improving temperature is unfavorable to the formation of inclusion complexes.
Spectroellipsometric Studies On Electrochemistry And Its Application, Zong-Qing Huang, Sheng-Tao Zhang, Shang-Fen Xie, Chang-Guo Chen, Yu-Ru Yang, Wei Zhu
Spectroellipsometric Studies On Electrochemistry And Its Application, Zong-Qing Huang, Sheng-Tao Zhang, Shang-Fen Xie, Chang-Guo Chen, Yu-Ru Yang, Wei Zhu
Journal of Electrochemistry
Ellipsometric measurements are often extremely sensitive to the presence of very thin surface layers,to changes in their thickness (or coverage), and to changes in surface topography at an atomic scale. These characteristics make the use of ellipsometry for electrochemical studies particularly attractive. The ellipsometric studies on electrochemistry and its applications carried out in the Electrochemical Laboratory of Chongqing University are reviewed briefly: 1)The studies on electrochemistry of classical ellipsometry. 2)The new function Vop suggested by the authors. 3)The applications of new approcaches with new function Vop suggested by the authors.
In Situ Ftirs Studies Of The Electrochemically Induced Coupling Of Osmium Nitrido Species In Acetonitrile, Sheng-Pei Chen, Shi-Gang Sun
In Situ Ftirs Studies Of The Electrochemically Induced Coupling Of Osmium Nitrido Species In Acetonitrile, Sheng-Pei Chen, Shi-Gang Sun
Journal of Electrochemistry
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Deactivation Of Nickel Oxide/Hydroxide To Electrooxidation Of H2Po2 Anions On Nickel Electrodes In Alkaline Solutions, Tai-Xiang Jiang, Hui-Huang Wu
Deactivation Of Nickel Oxide/Hydroxide To Electrooxidation Of H2Po2 Anions On Nickel Electrodes In Alkaline Solutions, Tai-Xiang Jiang, Hui-Huang Wu
Journal of Electrochemistry
Electrooxidation of hypophosphite anions on polycrystalline nickel in alkaline solutions has been investigated by cyclic voltammetry and open circuit potential measurements. The results are explained based on the mechanism that the first step of hypophosphite oxidation is the adsorption of hypophosphite ions on nickel, followed by the homolysis of its hydrogen bond with the formation of radicals. The oxidation of hypophosphite on nickel in alkaline medium occurs at lower potentials between ca. -0.8 V— -1.1 V (SCE) and phosphite ion is the only oxidation product. There is no indication of hypophosphite oxidation at higher potentials. Severe deactivation of the surface …
Preparation And Ionic Conductivity Of Nanometer-Sized Li2+XGdXSi1+XO3 By The Sol-Gel Method, Ru-Fen Chen, Xiu-Qin Song, Hua-Ting Liu
Preparation And Ionic Conductivity Of Nanometer-Sized Li2+XGdXSi1+XO3 By The Sol-Gel Method, Ru-Fen Chen, Xiu-Qin Song, Hua-Ting Liu
Journal of Electrochemistry
Li2+xGdxSi1-xO3(x =0～0.15) samples have been prepared by the Sol-Gel method. The power samples were characterized by DTA-TG, XRD and TEM. Ionic conductivity of the sinter was determined by means of A-C impedance measurements. The experimental results showed that the range of solid-solution was 0 < x ≤ 0.09, while the conductivity of samples raised with increasing amount of Gd2O3 added, and average grain size of samples was 80 nm. In comparing with the samples by the conventional solid state reaction, the samples prepared by Sol-Gel method required lower temperature and presented higher ionic conductivity.
Structural And Electrochemical Studies On Lithium Manganese Oxide Containing Li+ Prepared By Hydrothermal Method For Lithium Ion Batteries, De-Yao Liu, Jin-Kua You, Wei Chu, Yong Yang, Zu-Geng Lin
Structural And Electrochemical Studies On Lithium Manganese Oxide Containing Li+ Prepared By Hydrothermal Method For Lithium Ion Batteries, De-Yao Liu, Jin-Kua You, Wei Chu, Yong Yang, Zu-Geng Lin
Journal of Electrochemistry
In this paper, Todorokite manganese oxides containing Li+ with large tunnel structure (sample M5) have been synthesized by hydrothermal methods from natural manganese oxide nano fiber (sample M4). The structure and composition of the samples were characterized and analyzed by XRD, ICP, TGA and DTA. Its electrochemical behavior as a cathode materials for rechargeable lithium ion insertion were studied by galvanostatic charge/discharge measurements. XRD results show that the sample M4 is mainly composed of Birnessite and Vernadite structure. Although the sample M4 shows a high initial capacity of approximately 150 mAh/g, its performances decrease gradually over 30 cycles. It …