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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:對(duì)高純鎢中痕量釷的分離、富集及催化極譜測(cè)定了進(jìn)行了研究。它是用Ｈ２ＳＯ４（濃）－（ＮＨ４）２ＳＯ４深解高純鎢樣品，用鎂作載體，氫氧化鈉作共沉淀劑在ｐＨ值大于１３時(shí)使釷與鎢主體分離。用ＴＲＰＯ萃淋樹脂使釷與其它雜質(zhì)分離。在ｐＨ５．４的乙酸－乙酸鈉介質(zhì)中，當(dāng)有濃度為０．００３％的四丁基碘化銨和０．０４％的銅鐵試劑存在時(shí)，釷在峰電位為－１．６８Ｖ處產(chǎn)生靈敏配合物吸附波，波形穩(wěn)定，選擇性好。本法能測(cè)定高純