物理化学学报 >> 2005, Vol. 21 >> Issue (05): 523-527.doi: 10.3866/PKU.WHXB20050513

研究论文 上一篇    下一篇

掺锰氢氧化镍的结构与电化学性能

吴梅银; 王建明; 张鉴清; 曹楚南   

  1. 浙江大学化学系,杭州   310027;   中国科学院金属研究所,金属腐蚀与防护国家重点实验室,沈阳   110015
  • 收稿日期:2004-11-22 修回日期:2005-01-12 发布日期:2005-05-15
  • 通讯作者: 王建明 E-mail:wjm@cmsce.zju.edu.cn

Structure and Electrochemical Performance of Mn-substituted Nickel Hydroxide

WU Mei-Yin; WANG Jian-Ming; ZHANG Jian-Qing; CAO Chu-Nan   

  1. Department of Chemistry, Zhejiang University, Hangzhou    310027;   State Key Laboratory for Corrosion and Protection, Chinese Academy of Sciences, Shenyang   110015
  • Received:2004-11-22 Revised:2005-01-12 Published:2005-05-15
  • Contact: WANG Jian-Ming E-mail:wjm@cmsce.zju.edu.cn

摘要: 采用化学共沉淀法制备了锰取代的氢氧化镍样品,应用XRD技术对不同锰含量样品的相结构进行了表征,并用恒电流充放电、电流脉冲弛豫法和电化学阻抗技术研究了样品的电化学行为. XRD结果显示:锰含量少于20%时,样品主要由β相组成;而当锰含量达到28.3%时,可以得到具有纯α相结构的样品. 电化学研究结果表明:掺锰的氢氧化镍样品具有优良的电化学循环稳定性;锰的掺杂提高了氢氧化镍电极的析氧电位,增大了样品的质子扩散系数; 具有较低锰含量的氢氧化镍样品显示了较大的放电容量和较高的放电电位.

关键词: 掺锰氢氧化镍, 电化学性能, 质子扩散系数

Abstract: 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.

Key words: Mn-substituted Ni(OH)2, Electrochemical performance, Diffusion coefficient of proton