Charge transfer and mass transfer reactions in the metal hydride electrode |
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| Affiliation: | 1. Mechanical and Materials Engineering, University of Windsor, Windsor, Ont., Canada N9B 3P4;2. Centro de Investigacion en Energia-UNAM, 62580 Tomixco, Morelos, Mexico;3. Chemical Engineering, Teesside University, Middlesbrough, TS1 3BA, UK;4. Faculty of Engineering and Applied Science, Ryerson Polytechnic University, 350 Victoria Street, Toronto, Ont., Canada M5B 2K3;1. Department of Mathematics and Physics, Chongqing University of Science and Technology, Chongqing 401331, PR China;2. Department of Material Science, Sichuan University, Chengdu 610064, PR China;3. International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, PR China;1. Istituto per lo Studio dei Materiali Nanostrutturati (ISMN), Consiglio Nazionale delle Ricerche (CNR), via P. Gobetti 101, Bologna I-40129, Italy;2. Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, Trieste I-34149, Italy;1. Key Laboratory of Polar Materials and Devices, Ministry of Education, and Department of Electronic Engineering, East China Normal University, 500 Dongchuan Road, Minhang District, Shanghai 200241, China;2. Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China;1. Institute of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung, 807, Taiwan;2. Institute of Mold & Die Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung, 807, Taiwan |
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| Abstract: | Charge transfer reaction across the electrode/electrolyte interface and hydrogen diffusion in the negative MH alloy electrode dominate the high-rate discharge capability of the metal hydride electrode in a nickel metal hydride (Ni/MH) battery. The mass transfer process in the MH electrode mainly involves hydrogen diffusion in the bulk MH alloy. The charge transfer reaction in the negative electrode reflects the capability of hydrogen reduction and oxidation reactions at the surface of the MH alloy powder. In this study, an AB5-type hydrogen-absorbing alloy was used as the negative electrode material. The rate-determining mass transfer process in the bulk MH alloy electrode was studied and analyzed using anodic polarization measurements. The exchange current density, which is related to the charge transfer reaction, was analyzed by using the hydrogen equilibrium pressure. The estimation of hydrogen diffusion coefficient in the MH alloy is strongly dependent on the value of the effective reaction area of charge transfer reaction at the surface of the alloy powder. |
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