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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 10    No. 1    February 2000

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Electrochemical investigation on hydride electrode with tungsten carbide additive①
YANG Xiao-guang(杨晓光)1, ZHANG Xiao-bin(张孝彬)1, TAN Guo-long(谭国龙)1, ZHANG Wen-kui(张文魁)2, LEI Yong-quan(雷永泉)1, WANG Qi-dong(王启东)1, WU Xi-jun(吴希俊)1

1. Department of Materials Science and Engineering, Zhejiang University,
Hangzhou 310027, P.R.China;
2. Department of Applied Chemistry, Zhejiang University of Technology,
Hangzhou 310014, P.R.China

Abstract:Nano-meter-sized WC powder (1~20 nm) was synthesized by mechanochemical explosion synthesis. The catalytic property of WC powder was discovered to decompose the molecular water and chemical-adsorb H atoms in KOH solution, and accelerate the combination reaction of hydrogen during the cathodic polarization, thus a negative effect on the activation was found because of easy H2emission. Electrochemical impedance spectroscopy (EIS) showed that the adsorbed hydrogen atoms on the surface of WC are first electrochemically oxidized due to their lower chemical bonding, and that the low conductivity of WC powder also increases the internal resistance of electrodes.

 

Key words: hydrogen storage alloys; tungsten carbide; electrode performances; EIS

ISSN 1672-7029
CN 43-1423/U

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