Tolerance of non-platinum group metals cathodes proton exchange membrane fuel cells to air contaminants

JOURNAL OF POWER SOURCES

卷:324

Article

Reshetenko, Tatyana¹  Serov, Alexey²  Artyushkova, Kateryna²  Matanovic, Ivana^2,3  Stariha, Sarah²  Atanassov, Plamen² 

[1] Univ Hawaii, Hawaii Nat Energy Inst, Honolulu, HI 96822 USA

[2] Univ New Mexico, Dept Chem & Biol Engn, UNM Ctr Microengn Mat, Albuquerque, NM 87131 USA

[3] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

关键词: Non-platinum group metals catalysts;    PEMFC;    Airborne contaminants;    Segmented cell;    XPS;    DFT;   

DOI  :  10.1016/j.jpowsour.2016.05.090

来源: Elsevier

【 摘 要 】

The effects of major airborne contaminants (SO2, NO2 and CO) on the spatial performance of Fe/N/C cathode membrane electrode assemblies were studied using a segmented cell system. The injection of 2-10 ppm SO2 in air stream did not cause any performance decrease and redistribution of local currents due to the lack of stably adsorbed SO2 molecules on Fe-N-x sites, as confirmed by density functional theory (DFT) calculations. The introduction of 5-20 ppm of CO into the air stream also did not affect fuel cell performance. The exposure of Fe/N/C cathodes to 2 and 10 ppm NO2 resulted in performance losses of 30 and 70-75 mV, respectively. DFT results showed that the adsorption energies of NO2 and NO were greater than that of O-2, which accounted for the observed voltage decrease and slight current redistribution. The cell performance partially recovered when the NO2 injection was stopped. The long-term operation of the fuel cells resulted in cell performance degradation. XPS analyses of Fe/N/C electrodes revealed that the performance decrease was due to catalyst degradation and ionomer oxidation. The latter was accelerated in the presence of air contaminants. The details of the spatial performance and electrochemical impedance spectroscopy results are presented and discussed. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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