摘要
采用次亚磷酸钠溶液对熔体旋淬技术制备的快凝贮氢合金粉ＭｌＮｉ３．６Ｃｏ０．７Ｍｎ０．３Ａｌ０．４进行还原处理，使其表面形成一个富Ｎｉ层，可显著改善合金粉的电化学活性．经处理的快淬合金粉仅２次充放电循环其放电容量便可达到２４１ｍＡ·ｈ·ｇ－１，而未经处理的同一合金粉经５次充放电循环其放电容量也只有２２２ｍＡ·ｈ·ｇ－１．ＡＥＳ及ＸＰＳ分析表明表面氧化层的性质对于在碱溶液中金属氢化物电极的活化过程具有重要影响．
The AB(5)-type alloy powder (MINi3.6Co0.7Mn0.3Al0.4) prepared by melt-spinning was treated by a reducer (solution of sodium hypophosphite) to form a Ni-rich layer on the surface of the particles, which can obviously improved the activity of the quenched powder. For the treated alloy powder the discharge capacity after 2 cycles of charge-discharge reached an ideal value of 241 mA(.)h(.)g(-1), but only 222 mA(.)h(.)g(-1) for the non-treated alloy powder after 5 cycles of charge-discharge. AES and XPS results show that the nature of the oxide layer formed on the surface plays a key role on the activation process of the metal hydrides in alkaline solution.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第5期522-526,共5页
Acta Metallurgica Sinica
基金
国家自然科学基金资助项目:59671027
关键词
表面处理
贮氢合金
活化性能
surface treatment
hydrogen storage alloy
activation behavior
