Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 39, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202209486
Keywords
Competitive Adsorption; Hydrogen Evolution Reaction; OHad Transfer Process; Poisoning Effect; Ru Single-Atom
Categories
Funding
- Jiangsu Specially Appointed Professorship
- National Key R&D Program of China [2021YFA1502700]
- Natural Science Foundation of Jiangsu Province [BK20220369]
- European Union [GrapheneCore3: 881603]
- Deutsche Forschungsgemeinschaft
- CRC 1415 [417590517]
- Projekt DEAL
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In this study, a competitive adsorption strategy was used to construct Ru SAs-SnO2/C catalysts for improved alkaline hydrogen evolution reaction (HER) performance. By regulating the interaction strength between Ru and OHad, the poisoning of Ru sites was alleviated, resulting in low overpotential and low Tafel slope.
Ruthenium (Ru) has been theoretically considered a viable alkaline hydrogen evolution reaction electrocatalyst due to its fast water dissociation kinetics. However, its strong affinity to the adsorbed hydroxyl (OHad) blocks the active sites, resulting in unsatisfactory performance during the practical HER process. Here, we first reported a competitive adsorption strategy for the construction of SnO2 nanoparticles doped with Ru single-atoms supported on carbon (Ru SAs-SnO2/C) via atomic galvanic replacement. SnO2 was introduced to regulate the strong interaction between Ru and OHad by the competitive adsorption of OHad between Ru and SnO2, which alleviated the poisoning of Ru sites. As a consequence, the Ru SAs-SnO2/C exhibited a low overpotential at 10 mA cm(-2) (10 mV) and a low Tafel slope of 25 mV dec(-1). This approach provides a new avenue to modulate the adsorption strength of active sites and intermediates, which paves the way for the development of highly active electrocatalysts.
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