摘要
为了有效去除贮氢合金表面的氧化膜 ,改善贮氢材料的表面特性 ,以提高金属氢化物电极的电化学性能 ,将贮氢合金用 6mol/LKOH处理后 ,用pH为 5～ 6(含添加剂 )的缓冲溶液洗涤。以扫描电镜 (SEM)观察处理后的合金 ,发现合金表面形成的裂纹较少 ,X光电子能谱 (XPS)分析则表明 ,经处理后的贮氢合金表面氧含量从 48.6 %下降到 2 6 .5 % ,表面镍含量从 39.78%提高到 54 .2 1 % ;电感耦合等离子体 原子吸收光谱 (ICP AES)检测也得到了与XPS相似的结果。研究表明 ,本处理方法比通常用 6mol/LKOH +0 .2 5mol/LNaH2 PO2 处理的合金具有更好的表面形貌和更低的表面氧含量 ,有利于MH
Mm hydrogen storage alloy was treated with 6 mol/L KOH solution, then was washed with a buffer solution (pH=5～6) containing an additive to eliminate the oxide on its surface and to improve its surface cha racter, thus to enhance the electrochemical character of metal hydride electrode. SEM analysis shows that cracks formed on the treated alloy were less than that on the untreated alloy. XPS analysis shows that after treatment, the surface oxide content of Mm hydrogen storage alloy decreased from 48.6% to 26.5% and surface nickel content increased from 39.78% to 54.21%. Conclusions from ICP AES analysis were similar to that from XPS. Research results show that the alloy treated by the mentioned method has better morphologies and lower surface oxide content than that treated with 6 mol/L KOH+0.25 mol/L NaH 2PO 2 solution as usual, so it may be advantageous to improve the performance of Ni MH batteries.
出处
《电源技术》
CAS
CSCD
北大核心
2000年第3期144-145,共2页
Chinese Journal of Power Sources
