報文
交流インピーダンス法による水素吸蔵合金のアルカリ処理効果の解析
2000 年 68 巻 2 号 p. 98-105
詳細
2000 年 68 巻 2 号 p. 98-105
LaNi5−xMx(M = Al, Co, x = 0, 0.3, 0.5) electrodes were treated by immersing them in boiling alkaline solution to remove the oxide films from the alloy surface. The electrodes treated by immersing them in a boiling 6 mol dm−3 KOH solution for 2 h were activated rapidly, and the capacity was increased 10∼67%. The hydrogen absorbing reaction of the treated electrodes has been investigated using the AC impedance method and XPS, and has been compared with the non-treated electrode. From these results, it was found that the oxide films on the alloy surface were removed and the number of Ni clusters on the alloy surface was increased by the alkaline treatment. Therefore, the hydrogen absorbing reaction in which the diffusion of hydrogen atoms into the alloys follows the formation of hydrogen atoms was improved.
