Factors governing the electrochemical synthesis of α-nickel (II) hydroxide

被引:61
作者
Jayashree, RS [1 ]
Kamath, PV [1 ]
机构
[1] Bangalore Univ, Cent Coll, Dept Chem, Bangalore 560001, Karnataka, India
关键词
alpha-nickel hydroxide; electrochemical synthesis; nitrate bath;
D O I
10.1023/A:1003493711239
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The electrodeposition of alpha-nickel hydroxide is promoted by the simultaneous chemical corrosion of the electrode by an acidic nitrate bath. Chemical corrosion results in the formation of a poorly ordered layered phase which is structurally similar to alpha-nickel hydroxide and provides nucleation sites for the deposition of the latter. Therefore under conditions which enhance corrosion rates such as low current density (< 1.3 mA cm(-2)), high temperature (60 circle C), high nickel nitrate concentration (greater than or equal to 1 M) and the resultant low pH (similar to 1.7), alpha-nickel hydroxide electrodeposition is observed, while beta-nickel hydroxide forms under other conditions. Further, alpha-nickel hydroxide deposition is more facile on an iron electrode compared to nickel or platinum.
引用
收藏
页码:449 / 454
页数:6
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