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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 Ni电池性能的改善
In order to effectively remove the oxide film on the surface of the hydrogen storage alloy and improve the surface properties of the hydrogen storage material, in order to improve the electrochemical performance of the metal hydride electrode, the hydrogen storage alloy was treated with 6 mol / L KOH and treated with pH 5-6 ) Buffer solution. X-ray photoelectron spectroscopy (XPS) analysis showed that the surface oxygen content of the treated hydrogen storage alloy decreased from 48.6% to 26 after the treated alloy was observed with a scanning electron microscope (SEM). 5%, the surface nickel content increased from 39.78% to 54.21%; Inductively Coupled Plasma Atomic Absorption Spectrometry (ICP AES) test also obtained similar results with XPS. The results show that this method has better surface morphology and lower surface oxygen content than the alloy treated with 6mol / LKOH +0.25mol / LNaH2PO2, which is in favor of the improvement of the performance of MH Ni battery