应用化学 ›› 1998, Vol. 0 ›› Issue (1): 13-16.

• 研究论文 • 上一篇    下一篇

纳米级MnO2的制备与电化学性质研究(Ⅱ)溶胶凝胶法制备掺铋改性纳米MnO2的性能

夏熙, 门传玲   

  1. 新疆大学应用化学研究所 乌鲁木齐 830046
  • 收稿日期:1997-04-22 修回日期:1997-09-09 出版日期:1998-02-10 发布日期:1998-02-10
  • 基金资助:
    国家自然科学基金

Studies on the Preparation and Electrochemical Behavior of Nano-order MnO2-Ⅱ. Preparation and Performance of Bishmuth Doped MnO2 by Sol-gel Method

Xia Xi, Men Chuanling   

  1. Institute of Applied Chemistry, Xinjiang University, Urumqi 830046
  • Received:1997-04-22 Revised:1997-09-09 Published:1998-02-10 Online:1998-02-10

摘要: 用溶胶凝胶法制得掺铋二氧化锰.经XRD、TEM、ICP、化学分析等测定,确定了所得样品的主要晶型为α-MnO2,所掺铋的晶态为Bi2O3,为纳米级颗粒(记为um-Bi-CMD).用它与掺铋电解二氧化锰(记为Ci-EMD)以最佳配比混合,可大大提高充放电容量.通过循环伏安、交流电导率、交流电阻等测试所测得的电导率、电极表面的分形维数,初步解释了了充入电性能改善的原因主要是由于提高了最佳配比样品的导电率,降低了混合样品的晶界电阻,使制得的电极表面粗糙度增大,稳定了电极表面结构.

关键词: 掺铋二氧化锰, 纳米材料, 溶胶凝胶法, 制备

Abstract: Nanometer order bismuth doped chemical manganese dioxide (nm-Bi-CMD) wasprepared by sol-gel method.The results of XRD, TEM, ICP measurements and chemicalanalysis showed that the sample was of γ-type crystal structure, and in nano size.Mixingthe nm-Bi-CMD with Bi-EMD(electrolytic maganese dioxide) in optimum weight ratio in-creased the charge/discharge performance of the products.Cycle volrammogram, AC con-ductivity and AC impedance measurements showed that the doping of nm-Bi-CMD, decreas-ing the resistance between crystal grains of the doped samples, raised the surface roughnessand improved the stability of the electrode surface.

Key words: bismuth doped manganese dioxide, nano meter material, sol gel method, preparation