Journal
ACS CATALYSIS
Volume 13, Issue 12, Pages 7822-7830Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.3c01466
Keywords
fuel cells; PGM catalyst; hydrogen oxidationreaction; CO-tolerance; electron back-donation
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Developing CO-tolerant Pt-based catalysts is critical for fuel cell commercialization. A cascade strategy of introducing single-atomic Fe-N-C substrate and alloying is proposed to mitigate electron back-donation and improve CO tolerance.
Developing CO-tolerant Pt-based catalysts for the hydrogenoxidationreaction (HOR) is critical for the commercialization of fuel cellsand thus receiving increasing interest. Although it is known thatweakening the CO adsorption on Pt can improve CO tolerance, efficientstrategies are still needed. Inspired by theoretical simulations,we propose here a cascade strategy to synergistically mitigate electronback-donation of Pt 5d -> CO 2 pi* by introducing single-atomic Fe-N-C substrate andalloying, which significantly boosts the CO-tolerance of Pt-basedHOR catalysts. The obtained PtNiMo/Fe-N-C can maintainabove 80% HOR current density after 2000 s in 1000 ppm CO/H-2, substantially outperforming control catalysts and ranking amongthe state-of-the-art catalysts. The in situ surface-enhanced infraredadsorption spectroscopy validates that the effectively weakened COadsorption contributes to improved CO tolerance. This strategy opensup opportunities for designing advanced HOR catalysts with desiredCO tolerance.
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