Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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A Study on the Electrochemical Hydrogenation Reaction Mechanism of the Laves Phase Hydrogen Storage Alloys

Laves phase계 수소저장합금의 전기화학적 수소화 반응 매카니즘에 관한 연구

  • Lee, Ji-Youl (Department of Metallurgical Engineering, Kyungpook National University) ;
  • Kim, Chan-Jung (Department of Metallurgical Engineering, Kyungpook National University) ;
  • Kim, Dai-Ryong (Department of Metallurgical Engineering, Kyungpook National University)
  • 이지열 (경북대학교 금속공학과) ;
  • 김찬중 (경북대학교 금속공학과) ;
  • 김대용 (경북대학교 금속공학과)
  • Published : 1997.03.15
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Abstract

In order to investigate the mechanism of electrochemical hydrogenation reaction on Zr-based Laves phase hydrogen storage alloy electrodes, electrochemical charge/discharge characteristics, potentiostatic/dynamic polarizations and electrocehmical impedance spectroscopy(EIS) of Zr-Ti-Mn-Ni and Zr-Ti-Mn-Ni-M(M=Fe, Co, Al) alloys were examined. Electrochemical discharge capacities of the alloys were quite different with gas charge capacities. Therefore, it was considered that discharge capacities of the alloys depend on electrochemical kinetic factors rather then thermodynamic ones. Discharge efficiencies were increased linearly with exchange current densities. The results of potentiostatic/dynamic polarization measurements showed that electrochemical charge and discharge reaction of Zr-based Laves phase hydrogen storage alloys is controlled by charge transfer process at the electrode surface. The EIS measurements also confirmed this result.

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Acknowledgement

Supported by : 교육부