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Citation: CHANG Zhao-Rong, LI Bao, LI Yun-Ping, WEI Xian-Jun. Effects of Surface Cobalt Modifications on the Performance of Ni(OH)₂ Electrode[J]. Chinese Journal of Applied Chemistry, ;2003, 20(4): 360-364. shu

Effects of Surface Cobalt Modifications on the Performance of Ni(OH)₂ Electrode

1.
College of Chemistry and Environmental Science, He'nan Normal University, Xinxiang 453002

Corresponding author: CHANG Zhao-Rong,
Received Date: 18 September 2002
Available Online: 31 December 2002

The spherical Ni(OH)₂ was modified with cobalt by three methods:electroless plating with cobalt,coating with Co(OH)₂ and mixing with CoO.The difference of three modification methods on the performance of Ni(OH)₂ electrode has been investigated.The charge-discharge experiments and cyclic voltammetry results show that coating with Co(OH)₂ layer and electroless plating with cobalt greatly improved the charge-discharge efficiency and the reversibility of Ni(OH)₂ electrode,significantly improving the utilization of active material and specific capacity of the electrode.The SEM micrograph shows that the Co(OH)₂ coated layer and electroless plated Co are uniformly distributed on the surface of the Ni(OH)₂ grains.The result from X-ray diffraction patterns shows that the coated Co(OH)₂ layer and electroless plated Co can effectively prevent the formation of γ-NiOOH.It is concluded that the method of coating a layer of Co(OH)₂ on the spherical Ni(OH)₂ is the best among three methods.It is cheaper and simpler in technology.
- nickel hydroxide electrodes,surface modification,cobalt additive,
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Effects of Surface Cobalt Modifications on the Performance of Ni(OH)₂ Electrode