Durability of GDB for PEMFC modified by poly(1,5-diaminoanthraquinone)
The loss of hydrophobic materials in the gas diffusion backing(GDB)will accelerate the decline of the durability of the proton exchange membrane fuel cell(PEMFC).The durability of GDB for PEMFC modified by electrochemical deposition with poly(1,5-diaminoanthraquinone)(P15DAAQ)is studied by accelerated stress test with high constant-potential,and analyzed by the four-electron probe method and cyclic voltammetry method.Compared with PTFE-GDB prepared by impregnation method with polytetrafluoroethylene(PTFE),the stability of P15DAAQ-GDB under high voltage and acidic conditions is even worse.The loss of P15DAAQ leads to the decrease of the water management ability of the P15DAAQ-GDB gas diffusion layer,which causes a performance decline of membrane electrode assembly(MEA).After a durability test under a high potential of 1.45 V for 96 h,the peak power of the MEA assembled with P15DAAQ-GDB still reaches 1.789 W/cm2(90.17%of the initial performance).
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