Cu对非晶态Mg50Ni50电极电化学性能的影响

The Effects of Cu on the Electrochemical Properties of Amorphous Mg_(50)Ni_(50) Electrode

摘要:

研究了用Ｃｕ部分取代非晶态Ｍｇ５０Ｎｉ５０合金中的Ｎｉ后对其电化学性能的影响。结果表明，Ｃｕ置换部分Ｎｉ后，合金电极的电化学容量有所降低，但循工作寿命有所提高。对氧化物电极的电位分析表明，Ｎｉ在循环过程中可被部分氧化，而Ｃｕ保持金属态。用Ｃｕ置换部分Ｎｉ后，循环过程中合金粒子间导电性提高，对吸放氢过程具有催化作用的金属态Ｎｉ，Ｃｕ总量增加，故循环稳定性增加。但由于Ｎｉ对放氢过程的催化作用高于Ｃｕ，

Abstract:

The effects of partial substitution of nickel by copper in Mg50Ni50 amorphous electrode on itselectrochemical properties have been investigated. Results show that the electrochemical capacity of the alloyis decreased while the cycling life is enhanced after substitution.Analysis on electrode potential shows that theNi atoms in the alloy are partially oxidized while the Cu atoms remains in metallic state during theelectrochemical cycling.After partial substitution of nickel by copper, the electric conductivity along the alloypartials are enhanced,and the whole amounts of the metallic Cu and Ni, which have catalystic effect onhydrogen charge / discharge procedure,are increased.Thus the cycling stability of the alloy is improved. Butthe initial capacity (also maximum capacity) of the alloy decreases for the catalystic effect of Cu being lowerthan Ni.