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.

Abstract:对高纯钨中痕量钍的分离、富集及催化极谱测定了进行了研究。它是用Ｈ２ＳＯ４（浓）－（ＮＨ４）２ＳＯ４深解高纯钨样品，用镁作载体，氢氧化钠作共沉淀剂在ｐＨ值大于１３时使钍与钨主体分离。用ＴＲＰＯ萃淋树脂使钍与其它杂质分离。在ｐＨ５．４的乙酸－乙酸钠介质中，当有浓度为０．００３％的四丁基碘化铵和０．０４％的铜铁试剂存在时，钍在峰电位为－１．６８Ｖ处产生灵敏配合物吸附波，波形稳定，选择性好。本法能测定高纯