| PEMFC电极中表面扩散现象的初步研究 |
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| 引用本文： | 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. |
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| 作者姓名： | 罗江水 陈剑 衣宝廉 查全性 张华民 |
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| 作者单位： | 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; |
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| 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.
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| 关 键 词： | PEMFC 表面扩散 成流机理 氧还原反应 阴极催化层 |
| 收稿时间： | 2008-11-28 |
Studies of Surface Diffusion in PEMFC Electrodes |
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| LUO Jiang-shui,CHEN Jian,YI Bao-lian,CHA Chuan-sin,ZHANG Hua-min.Studies of Surface Diffusion in PEMFC Electrodes[J].Electrochemistry,2008,14(4):369. |
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| Authors: | LUO Jiang-shui CHEN Jian YI Bao-lian CHA Chuan-sin ZHANG Hua-min |
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| Institution: | LUO Jiang-shui1,2,CHEN Jian1*,YI Bao-lian1*,CHA Chuan-sin3,ZHANG Hua-min1(1.PEMFC Key Materials , 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 , Molecular Sciences,Wuhan University,Wuhan 430072,China) |
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| 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 ele... |
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| Keywords: | PEMFC |
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