催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (5): 473-476.

• 研究论文 • 上一篇    下一篇

β-MnO2纳米带的制备及其电催化氧还原活性

袁中直,王辉,王莉,关菊英,肖信   

  1. 华南师范大学化学与环境学院, 广东广州 510006
  • 收稿日期:2008-05-25 出版日期:2008-05-25 发布日期:2012-05-02

Preparation of β-MnO2 Nanobelt and Its Electrocatalytic Activity for Oxygen Reduction

YUAN Zhongzhi*, WANG Hui, WANG Li, GUAN Juying, XIAO Xin   

  1. School of Chemistry and Environment, South China Normal University, Guangzhou 510006, Guangdong, China
  • Received:2008-05-25 Online:2008-05-25 Published:2012-05-02

PDF

1041

被引次数

26

摘要： 在150 ℃水热条件下,以十六烷基三甲基溴化铵为模板,用HMnO4氧化MnSO4, 得到的反应产物通过X射线衍射和扫描电镜测试表明为β-MnO2纳米带. 分别用β-MnO2纳米带和电解二氧化锰(EMD)作为氧还原催化剂冷压制成气体扩散电极,在6 mol/LKOH水溶液中进行稳态极化测试. 结果表明,β-MnO2纳米带的电极电位比EMD正移30～60 mV, 当催化膜中β-MnO2纳米带的含量在35%时催化活性最高. 在一般锌/空气电池的工作电流密度40 mA/cm2下,通过电池放电测试得到β-MnO2的工作电压达到1.12 V.

关键词: 锌/空气电池, 空气扩散电极, 氧还原, 水热法合成, 二氧化锰催化剂

Abstract: Manganese oxide was synthesized by the hydrothermal method through oxidizing MnSO4 withHMnO4at 150 ℃ using cetyltrimethylammonium bromide as template.X-raydiffraction and scanning electron microscopy showed that the product was β-MnO2 nanobelt. The β-MnO2 nanobelt and electrolytic manganese dioxide (EMD) were used as catalyst to make air diffusion electrodes by mixing activated carbon and polytetrafluoroethylene. In6 mol/LKOH aqueous solution, current-potential polarization curves showed that the air electrode potential with β-MnO2 nanobelt catalyst was more positive by 30-60 mV than that of EMD, and the optimal content of β-MnO2 nanobelts in the electrocatalyst was 35%. At the typical current density 40 mA/cm2 of a Zn/air battery, the cell with the β-MnO2 nanobelt catalyst had stable discharge voltage up to 1.12 V.

Key words: zinc/air battery, air diffusion electrode, oxygen reduction, hydrothermal synthesis, manganese dioxide catalyst