Chemical Industry and Engineering Progree ›› 2012, Vol. 31 ›› Issue (03): 541-544.

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Studies on the performance of polypyrrole-Nafion composite membranes in direct methanol fuel cells

CHEN ShengzhouWANG SongqingLIN Weiming   

  1. (School of Chemistry and Chemical Engineering,Guangzhou University,Guangzhou 510006,Guangdong,China)
  • Online:2012-03-05 Published:2012-03-05

聚吡咯修饰Nafion膜直接甲醇燃料电池的性能

陈胜洲,王松青,林维明   

  1. (广州大学化学化工学院,广东 广州 510006)

Abstract: Polypyrrole modified Nafion membranes(PPy/Nafion)are prepared by FeCl3 oxidation methods. In addition,Co is chemically reduced on the cathode side of the modified membrane to prepare Co-PPy/Nafion membrane. The thermal stability,methanol penetrability and proton conductivity of Nafion membranes and the modified membranes are studied by TG,CV and AC impedance. Results show that PPy/Nafion and Co-PPy/Nafion have better thermal stability and low methanol permeation than Nafion membrance. Membrane-electrode-assemblies(MEAs)for a DMFC are fabricated by using Nafion membranes,PPy/Nafion and Co-PPy/Nafion respectively,with PtRu/C as an anode catalyst and Pt/C as a cathode catalyst. It is found that the modification of Nafion membrane with Co-polypyrrole can improve the performance of MEA to a great extent when the cell is operated at higher methanol concentrations and higher discharging current densities.

Key words: Nafion membrane, polypyrrole, methanol permeability, proton conductivity

摘要: 用FeCl3化学氧化法制备了PPy/Nafion改性膜,采用浸渍-还原法在PPy/Nafion阴极侧上沉积Co金属,制得Co-PPy/Nafion电解质膜。采用TG、CV及交流阻抗谱测试了Nafion膜及改性膜的热稳定性,质子电导性和甲醇渗透性能,结果表明:PPy/Nafion及Co-PPy/Nafion改性膜具有更好的热稳定性和抗甲醇渗透性。分别以Co-PPy/Nafion改性膜、PPy/Nafion改性膜和纯Nafion膜为电解质膜,PtRu/C为阳极催化剂,Pt/C为阴极催化剂组装DMFC并考察其性能。实验结果表明:Co-PPy/Nafion改性膜组装单电池在高浓度甲醇及大电流密度的测试条件下,表现出更优异的电池性能。

关键词: Nafion膜, 聚吡咯, 甲醇渗透, 质子电导率

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