Journal
ACS CATALYSIS
Volume 13, Issue 1, Pages 49-59Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.2c04586
Keywords
electrocatalysis; single-atomic site; substrate effect; vacancy defect; hydrogen evolution reaction
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In this study, oxygen-coordinated single-atom iron sites decorated carbon nanotubes were used as a substrate for stabilizing Ru clusters in hydrogen evolution reaction (HER). The defective substrate with single-atomic sites significantly improved the intrinsic activity of Ru species. Theoretical calculations supported the superior HER behavior of CNT-V-Fe-Ru and provided fundamental insights into metal-substrate interactions.
Water electrolysis powered by renewable electric energy is a promising technology for green hydrogen production without carbon emissions, while highly efficient and cost-effective electrocatalysts with long durability are urgently needed. Here, we demonstrate oxygen-coordinated single-atom iron sites (Fe-O-4) decorated carbon nanotubes with abundant vacancies as the substrate for stabilizing Ru clusters (CNT-V-Fe-Ru). The catalyst shows high performance for the hydrogen evolution reaction (HER) in both acidic and alkaline media, respectively. The HER kinetics analysis demonstrates that the defective substrate with single-atomic sites could significantly improve the intrinsic activity of Ru species. Theoretical calculations also support the superior HER behavior of CNT-V-Fe-Ru with fundamental insights into metal-substrate interactions. The present study highlights a unique feature of single-atom catalysts for serving as advanced supporting materials, which offers tremendous opportunities to adequately regulate electronic structures of metal-substrate interfaces at the atomic level.
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