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研究论文

PEMFC电极中表面扩散现象的初步研究

  • 罗江水 ,
  • 陈剑 ,
  • 衣宝廉 ,
  • 查全性 ,
  • 张华民
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  • 中国科学院大连化学物理研究所燃料电池关键材料与技术研究组;中国科学院研究生院;武汉大学化学与分子科学学院;

收稿日期: 2008-11-28

  修回日期: 2008-11-28

  网络出版日期: 2008-11-28

Studies of Surface Diffusion in PEMFC Electrodes

  • LUO Jiang-shui ,
  • CHEN Jian ,
  • YI Bao-lian ,
  • CHA Chuan-sin ,
  • ZHANG Hua-min
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  • (1.PEMFC Key Materials and Technology Laboratory,Dalian Institute of Chemical Physics,ChineseAcademy of Sciences,Dalian 116023,Liaoning China;2.Graduate University of the Chinese Academy ofSciences,Beijing 100039,China;3.College of Chemistry and Molecular Sciences,Wuhan University,Wuhan 430072,China

Received date: 2008-11-28

  Revised date: 2008-11-28

  Online published: 2008-11-28

摘要

制作双催化层结构的PEMFC电极.该双催化层由含有Nafion的内催化层、无Nafion的外催化层组成.循环伏安测试表明,未与Nafion直接接触的外催化层Pt/C催化剂也参与发生在"Pt/Nafion"界面氢原子的吸脱附反应和Pt表面含氧粒子的电化学氧化还原.当电势扫描速率较低时,未与Nafion直接接触的外层Pt/C催化剂,其对氢脱附电流的贡献和直接与Nafion接触的内催化层的Pt/C催化剂大致相当.以双催化层电极作PEMFC阴极,单电池(PEMFC)极化曲线测试表明,其阴极外催化层能明显地提高该单电池在活化极化区的输出性能.进一步证明了PEMFC阴极外催化层不与Nafion直接接触的Pt/C催化剂可通过其表面吸附含氧粒子的表面扩散参与发生在"Pt/Nafion"界面氧的电化学还原反应.上述实验为设计PEMFC电极提供了一定的新思路.

本文引用格式

罗江水 , 陈剑 , 衣宝廉 , 查全性 , 张华民 . PEMFC电极中表面扩散现象的初步研究[J]. 电化学, 2008 , 14(4) : 369 -372 . DOI: 10.61558/2993-074X.1923

Abstract

A PEMFC electrode consisting of dual-layer catalyst layer(CL) was fabricated in this work.The outer CL was Nafion-free,while the inner CL was Nafion-bonded.The effects of Pt/C catalyst in the outer CL that did not contact with Nafion on the current generation in PEMFC electrodes were investigated.Cyclic voltammetric studies indicated that the Pt/C catalyst in the outer CL without direct contact with Nafion was still electrochemically active in taking part in the adsorption/desorption of hydrogen and the electrochemical oxidation/reduction of the oxygen-containing species occurring at the interface of "Pt/Nafion" in the inner CL.The polarization curves showed that the output voltage of the single cell was enhanced obviously by the outer CL when the current density was lower than 0.2A/cm2.The phenomena indicated that the Pt/C catalyst without direct contact with Nafion also participated in the electrochemical reduction of oxygen at the interface of "Pt/Nafion" via the surface diffusion of the adsorbed oxygen-containing species.

参考文献

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