聚吡咯修饰Nafion膜直接甲醇燃料电池的性能  

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

作　　者：陈胜洲[1] 王松青[1] 林维明[1] 

机构地区：[1]广州大学化学化工学院,广东广州510006

出　　处：《化工进展》2012年第3期541-544,557,共5页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(21076048);广东省科技计划(2008B010800036;2008B010800037)项目

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。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.

关 键 词：NAFION膜 聚吡咯 甲醇渗透 质子电导率 

分 类 号：O646[理学—物理化学] TM911.4[理学—化学]