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Kinetic Model of Hypophosphite Oxidation on a nickel electrode in D_2O Solution

Chinese Chemical Letters 2001年第7期12卷 641-644页

作者： Yue ZENG Hui Xian WANG Shang Ci YU Xin De WU Xue Qiang CAO Department of Chemistry Hunan Normal UniversityChangshaHunan 410006 Department of Chemistry Jishou UniversityJishouHunan 416000

Kinetic model of hypophosphite oxidation on a nickel electrode was studied in D2O solution in order to reach a better understanding of the oxidation mechanism. In the model;he electrooxidation of hypophosphite undergo a H abstraction of hypophosphite from the P-H bond to form the phosphorus-centered radical (PWO2-)-P-., which subsequently is electrochemically reacted with water to form the final product, phosphite. The kinetic equations were derived, and the kinetic parameters were obtained from a comparison of experimental results and the kinetic equations. The process of hypophosphite electrooxidation could be well simulated by this model.

关键词： Kinetic model hypophosphite oxidation mechanism nickel electrode

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Electrolysis of ammonia for hydrogen production catalyzed by Pt and Pt-Ir deposited on nickel foam

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Journal of Energy Chemistry 2014年第1期23卷 1-8页

作者： Min Jiang Dandan Zhu Xuebo Zhao The Qingdao Key Lab of Solar Energy Utilization and Energy Storage Technology Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of Sciences

Electrolysis of ammonia in alkaline electrolyte solution was applied for the production of hydrogen. Both Pt-loaded Ni foam and Pt-Ir loaded Ni foam electrodes were prepared by electrodeposition and served as anode and cathode in ammonia electrolytic cell, respectively. The electrochemical behaviors of ammonia in KOH solution were individually investigated via cyclic voltammetry on three electrodes, i.e. bare Ni foam electrode, Pt-loaded Ni foam electrode and Pt-Ir loaded Ni foam electrode. The morphology and composition of the prepared Ni foam electrode were analyzed by scanning electron microscopy(SEM) and X-ray diffraction(XRD). Effects of the concentration of electrolyte solution and temperature of electrolytic cell on the electrolysis reaction were examined in order to enhance the efficiency of ammonia electrolysis. The competition of ammonia electrolysis and water electrolysis in the same alkaline solution was firstly proposed to explain the changes of cell voltage with the electrolysis proceeding. At varying current densities, different cell voltages could be obtained from galvanostatic *** low cell voltage of 0.58 V, which is less than the practical electrolysis voltage of water(1.6 V), can be obtained at a current density of2.5 mA/cm2. Based on some experimental parameters, such as the applied current, the resulting cell voltage and output of hydrogen gas, the power consumption per gram of H2produced can be estimated.

关键词： ammonia elelctrolysis nickel electrode hydrogen produciton catalyst power consumption

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