Surface modification for La_1-xCe_x(NiCoMnAl)₅ hydride electrode byhot charging in potassium borohydride solution

来源期刊：中国有色金属学报(英文版)2000年第5期

论文作者：文明芬 陈廉 于波 佟敏 陈德民 田彦文 翟玉春

文章页码：595 - 598

Key words：hydrogen storage alloy; surface modification; KBH₄ alkaline aqueous solution; hot charging treatment

Abstract: The La_1-xCe_x(NiCoMnAl)₅ alloy electrodes were treated by hot charging in alkaline aqueous solution containing KBH₄. The activation behavior, hydrogen diffusion coefficient and maximum discharging capacity, high rate discharging capability of alloy electrodes were tested. The surface morphology and element content were observed by scanning electron microscope. The results show that the alloy electrode is fully activated after the second charging-discharging cycle and has a high rate discharging capability of 85% at 900mA/g. The surface has a lot of micro-cracks and hy drogen diffusion coefficient is about (2~3)×10^-9cm²/s . Therefore, this method can markedly improve activation behavior and high rate charging capacity of the alloy electrode. The mechanism of this surface modification of the alloy electrode is also discussed.