Studies of Surface Diffusion in PEMFC Electrodes

Authors

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

Corresponding Author

Jian CHEN(chenjian@dicp.ac.cn);
Bao-lian YI(blyi@dicp.ac.cn)

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.

Keywords

PEMFC, surface diffusion, current-generation mechanism, oxygen reduction reaction, cathode catalyst layer

DOI Link

https://doi.org/10.61558/2993-074X.1923

Publication Date

2008-11-28

Online Available Date

2008-11-28

Revised Date

2008-11-28

Received Date

2008-11-28

Recommended Citation

Jiang-shui LUO, Jian CHEN, Bao-lian YI, Chuan-sin CHA, Hua-min ZHANG. Studies of Surface Diffusion in PEMFC Electrodes[J]. Journal of Electrochemistry, 2008 , 14(4): 369-372.
DOI: 10.61558/2993-074X.1923
Available at: https://jelectrochem.xmu.edu.cn/journal/vol14/iss4/4