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Citation: WU Mei-Yin, WANG Jian-Ming, ZHANG Jian-Qing, CAO Chu-Nan. Structure and Electrochemical Performance of Mn-substituted Nickel Hydroxide[J]. Acta Physico-Chimica Sinica, ;2005, 21(05): 523-527. doi: 10.3866/PKU.WHXB20050513 shu

Structure and Electrochemical Performance of Mn-substituted Nickel Hydroxide

1.
Department of Chemistry, Zhejiang University, Hangzhou 310027; State Key Laboratory for Corrosion and Protection, Chinese Academy of Sciences, Shenyang 110015

Received Date: 22 November 2004
Available Online: 15 May 2005

The Mn-substituted Ni(OH)₂ samples were prepared by a coprecipitation method, and their structure was characterized by X-ray diffraction(XRD). Their electrochemical performance was also investigated by various electrochemical techniques. The results of XRD indicated that the Ni(OH)₂ samples with Mn contents less than 20% mainly consist of β-phase, and the sample with a pure α structure can be obtained when the Mn content reaches 28.3%. The results of the electrochemical experiments showed that the Mn-substituted Ni(OH)₂ samples manifest high electrochemical cycling stability, and the samples with lower manganese contents exhibit larger discharge capacity and higher discharge potential. It was also found that the doping of Mn obviously increases the oxygen evolution potential and leads to the formation of proton deficiency.
- Mn-substituted Ni(OH)₂; Electrochemical performance; Diffusion coefficient of proton
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