Journal
SMALL
Volume 18, Issue 29, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202202404
Keywords
alkaline polymer electrolyte fuel cells; conduction band minimum; d-d orbital coupling; hydrogen oxidation reaction; Ru
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Funding
- National Key Research and Development program of China [2018YFB1502302, 2021YFB4001200]
- National Natural Science Foundation of China [21972107]
- Fundamental Research Funds for the Central Universities [2042022kf1179]
- Natural Science Foundation of Jiangsu Province [BK20191186]
- Natural Science Foundation of Hubei Province [2020CFA095]
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In this study, a strategy to enhance the alkaline hydrogen oxidation reaction (HOR) performance of Ru in alkaline polymer electrolyte fuel cells (APEFCs) was reported. By incorporating 3d-transition metals, the conduction band minimum (CBM) level of Ru was tailored, leading to outstanding HOR performance of RuFe nanosheet with higher mass activity than Ru and commercial Pt/C catalysts.
The alkaline polymer electrolyte fuel cells (APEFCs) hold great promise for using nonnoble metal-based electrocatalysts toward the cathodic oxygen reduction reaction (ORR), but are hindered by the sluggish anodic hydrogen oxidation reaction (HOR) in alkaline electrolytes. Here, a strategy is reported to promote the alkaline HOR performance of Ru by incorporating 3d-transition metals (V, Fe, Co, and Ni), where the conduction band minimum (CBM) level of Ru can be rationally tailored through strong d-d orbital coupling. As expected, the obtained RuFe nanosheet exhibits outstanding HOR performance with the mass activity of 233.46 A g(PGM)(-1) and 23-fold higher than the Ru catalyst, even threefold higher than the commercial Pt/C. APEFC employing this RuFe as anodic catalyst gives a peak power density of 1.2 W cm(-2), outperforming the documented Pt-free anodic catalyst-based APEFCs. Experimental results and density functional theory calculations suggest the enhanced OH-binding energy and reduced formation energy of water derived from the downshifted CBM level of Ru contribute to the enhanced HOR activity.
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