PEMFC电极中表面扩散现象的初步研究

CORC > 厦门大学 > 2008年第14卷

	PEMFC电极中表面扩散现象的初步研究; Studies of Surface Diffusion in PEMFC Electrodes
	罗江水 ; 陈剑 ; 衣宝廉 ; 查全性 ; 张华民 ; LUO Jiang-shui ; CHEN Jian ; YI Bao-lian ; CHA Chuan-sin ; ZHANG Hua-min
刊名	http://electrochem.xmu.edu.cn/CN/abstract/abstract8576.shtml
	2008-11-28
关键词	PEMFC 表面扩散成流机理氧还原反应阴极催化层 PEMFC surface diffusion current-generation mechanism oxygen reduction reaction cathode catalyst layer
英文摘要	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.; 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.; 作者联系地址：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;; Author's Address: 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
语种	中文
出版者	厦门大学《电化学》编辑部
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/58126]
专题	2008年第14卷
推荐引用方式 GB/T 7714	罗江水,陈剑,衣宝廉,等. PEMFC电极中表面扩散现象的初步研究, Studies of Surface Diffusion in PEMFC Electrodes[J]. http://electrochem.xmu.edu.cn/CN/abstract/abstract8576.shtml,2008.
APA	罗江水.,陈剑.,衣宝廉.,查全性.,张华民.,...&ZHANG Hua-min.(2008).PEMFC电极中表面扩散现象的初步研究.http://electrochem.xmu.edu.cn/CN/abstract/abstract8576.shtml.
MLA	罗江水,et al."PEMFC电极中表面扩散现象的初步研究".http://electrochem.xmu.edu.cn/CN/abstract/abstract8576.shtml (2008).