Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (1): 153.

• Articles • Previous Articles     Next Articles

Electrocatalytic Performances of MmNi3.2Al0.2Mn0.6Co1.0 Modified with MnO2 for NaBH4 Oxidation

WANG Gui-Ling1*, CHENG Yuan-Hui1, ZHANG Wei-Cai1, LU Tian-Hong2, CAO Dian-Xue1, LÜ Yan-Zhuo1, ZHANG Sen1   

  1. 1. College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China;
    2. College of Chemistry and Environmental Science, Nanjing Normal University, Nanjing 210097, China
  • Received:2009-02-05 Online:2010-01-10 Published:2010-01-10
  • Contact: WANG Gui-Ling. E-mail: wangguiling@hrbeu.edu.cn
  • Supported by:

    哈尔滨市青年创新人才基金(批准号: RC2006QN001021, 2007RFQXG023)和哈尔滨工程大学基础研究基金(批准号: HEUFT07051, HEUFT07040)资助.

Abstract:

The effect of KOH treatment and MnO2 adulteration of the MmNi3.2Al0.2 Mn0.6Co1.0(Mm is misch metal) on the electrocatalytic activity for borohydride oxidation was investigated by the linear sweeping voltammograms test. It was found that the peak potential and current density of the NaBH4 oxidation at the MmNi3.2Al0.2Mn0.6Co1.0 catalyst without any treatments are -0.65 V and 14 mA/cm2, respectively. After KOH treatment, the peak potential remains the same, but the peak current density reached 50 mA/cm2, which is 3.6 times of that at the un-treated MmNi3.2Al0.2Mn0.6Co1.0. KOH treatment followed by the MnO2 adulteration further increased the electrocatalytic activity of the MmNi3.2Al0.2Mn0.6Co1.0. When the mass fraction of MnO2 to MmNi3.2Al0.2Mn0.6Co1.0 is 10%, the peak potential and current density are -0.45 V and 126 mA/cm2, respectively. The peak current density is 2.5 and 9 times of that at the MmNi3.2Al0.2Mn0.6Co1.0 with and without KOH treatment, respectively.

Key words: Direct borohydride fuel cell; MnO2 adulteration; Hydrogen storage alloy; Electrooxidation

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