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
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
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