A Novel Preparation for a Self-humidifying Membrane Electrode Assembly and Performance of Its Fuel Cell

Abstract

Abstract: A novel method for the preparation of a self-humidifying MEA used for PEMFC and the optimum conditions for the fabrication are presented. Different from the method involved dispersion of Pt particles through out the membrane or between two thin membranes. The new type self-humidifying MEA gain self-humidifying operation by asymmetry electrode. The anode with 0.1 mg Pt/cm², has super-hydrophilicity by coating the hydrophilic colloid, while the cathode with 0.4 mg Pt/cm², has a strong hydrophobic nature by doping PTFE. When the current density is less than 2.3 A/cm², the discharge performance of the humidifying gases little excel the self-humidifying operation, but more than 2.3 A/cm², the self-humidifying operation do better than humidifying gases operation, and the most power density reaches over 1.5 W/cm². Inner resistance of electrochemistry reaction and transportation are studied by the AC impedance method, and validate that the self-humidifying MEA can give a good three-dimension reaction area with dry hydrogen and dry oxygen.

Key words: Proton exchange membrane, Fuel cell, Self-humidifying, Water management

CLC Number:

TM911.4

TrendMD:

WANG Cheng, MAO Zong-Qiang, XU Jing-Ming, XIE Xiao-Feng. A Novel Preparation for a Self-humidifying Membrane Electrode Assembly and Performance of Its Fuel Cell[J]. Chem. J. Chinese Universities, 2003, 24(1): 140.

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A Novel Preparation for a Self-humidifying Membrane Electrode Assembly and Performance of Its Fuel Cell

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