物理化学学报 >> 2010, Vol. 26 >> Issue (12): 3199-3202.doi: 10.3866/PKU.WHXB20101206

电化学 上一篇    下一篇

NH4+对甲酸在炭载Pd催化剂上氧化性能的影响

李焕芝, 唐亚文, 陆天虹   

  1. 南京师范大学化学与材料科学学院, 南京210097
  • 收稿日期:2010-08-16 修回日期:2010-10-10 发布日期:2010-12-01
  • 通讯作者: 陆天虹 E-mail:tianhonglu@263.net
  • 基金资助:

    国家自然科学基金(20873065, 21073094)资助项目

Effect of NH4+ on the Electrocatalytic Performance of Carbon Supported Pd Catalyst for Formic Acid Oxidation

LI Huan-Zhi, TANG Ya-Wen, LU Tian-Hong   

  1. College of Chemistry and Material Science, Nanjing Normal University, Nanjing 210097, P. R. China
  • Received:2010-08-16 Revised:2010-10-10 Published:2010-12-01
  • Contact: LU Tian-Hong E-mail:tianhonglu@263.net
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20873065, 21073094).

摘要:

为了解HClO4、NH4ClO4和NaClO4电解液对炭载Pd(Pd/C)催化剂电极对甲酸氧化的电催化性能的影响, 在用X射线衍射(XRD)谱、能量色散谱(EDS)和透射电子显微镜(TEM)对Pd/C 催化剂进行表征的基础上,采用电化学方法测量了Pd/C催化剂在不同电解液中对甲酸氧化的电催化性能. 发现在不同电解液中, Pd/C催化剂对甲酸氧化的电催化活性和稳定性按NH4ClO4>NaClO4>HClO4的次序降低. 由于甲酸的存在, 不同电解液的pH相差较小, 因此, 电解液的pH影响较小, 而阳离子的影响较大. 在NaClO4电解液中的性能优于在HClO4电解液中的性能是pH的影响. 在NH4ClO4电解液中的性能优于在NaClO4电解液中是由于NH4+能降低CO在Pd/C催化剂电极上的吸附强度和吸附量, 这一发现对提高直接甲酸燃料电池(DFAFC)的性能很有意义.

关键词: 甲酸, 电解液, 钯, 直接甲酸燃料电池

Abstract:

We investigated the effect of HClO4, NH4ClO4, and NaClO4 electrolytes on the electrocatalytic performance of a Pd/C catalyst electrode for formic acid oxidation. The Pd/C catalyst was characterized by X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), and transmission electron microscopy (TEM). The performance of the Pd/C catalyst electrode during formic acid oxidation in different electrolytes was measured using electrochemical methods. We found that the electrocatalytic activity and stability of the Pd/C catalyst electrode for formic acid oxidation decreased in the following order: NH4ClO4 > NaClO4 > HClO4. The difference in pH between the different electrolytes was small because of the presence of formic acid. Therefore, the electrolyte pH has a small effect and the cations have a large effect. The better performance of the NaClO4 electrolyte compared to the HClO4 electrolyte is due to a pH effect. The better performance of the NH4ClO4 electrolyte compared to the NaClO4 electrolyte is due to NH4+ decreasing the adsorption strength and amount of CO on the Pd/C catalyst. This finding has large significance for the increase in the performance of the direct formic acid fuel cell (DFAFC).

Key words: Formic acid, Electrolyte, Palladium, Direct formic acid fuel cell

MSC2000: 

  • O643