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Impedance of metal hydride electrodes. Rate of phase transformation limited by nucleation and growth mechanisms |
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| Institution: | 1. Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2201, Japan;2. Hyogo Prefectural Institute of Technology, Suma-ku, Kobe, Hyogo 654-0037, Japan;3. Materials Processing Unit, National Institute for Materials Science (NIMS), 1-2-1, Sengen, Tsukuba, Ibaraki 305-0047, Japan;4. Materials Analysis Station, NIMS, 1-2-1, Sengen, Tsukuba, Ibaraki 305-0047, Japan;5. Synchrotron X-ray Station at SPring-8, NIMS, Kouto 1-1-1, Sayo-cho, Hyogo 679-5148, Japan |
| Abstract: | A mathematical model for the electrochemical impedance spectroscopy of a metal hydride electrode was developed. Ac impedance data of phase transformation were derived by considering a nucleation and growth mechanism based on the theory developed by Johnson–Mehl–Avramy. Different mechanisms such as grain edge and grain boundary preferential nucleation sites are discussed. Global Nyquist plots of the metal hydride electrode are obtained by adding a surface charge transfer reaction and a double-layer capacitance to the model. |
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