Activity and Stability of Rare Earth-Based Hydride Alloys as Catalysts of Hydrogen Absorption-Oxidation Reactions


Ying Taokai, Gao Xueping~2, Hu Weikang)~(3*),Noréus Dag ~3(1. College of Biology and Chemistry, Zhejiang Normal University, Jinhua 321004,China; 2. Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071,China; 3. Department of Structural Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden)


Rare earth-based AB_5-type hydrogen storage alloys as catalysts of hydrogen-diffusion electrodes for hydrogen absorption and oxidation reactions in alkaline fuel cells were investigated. It is demonstrated that the meta-hydride hydrogen-diffusion electrodes could be charged by hydrogen gas and electrochemically discharged at the same time to retain a stable oxidation potential for a long period. The catalytic activities and stability are almost comparable with a Pt catalyst on the active carbon. Further improvement of performances is expected via reduction of catalyst size into nanometers.


inorganic chemistry;electrocatalyst;alkaline fuel cell;hydrogen oxidation;rare earths


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