Competitive adsorption: reducing the poisoning effect of adsorbed hydroxyl on 
Ru single‐atom site with SnO2 for efficient hydrogen evolution

Zhang, Jiachen; Chen, Guangbo; Liu, Qicheng; Fan, Chuang; Sun, Dongmei; Tang, Yawen; Sun, Hanjun; Feng, Xinliang

doi:10.1002/anie.202209486

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Competitive adsorption: reducing the poisoning effect of adsorbed hydroxyl on Ru single‐atom site with SnO₂ for efficient hydrogen evolution

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Feng, Xinliang
Department of Synthetic Materials and Functional Devices (SMFD), Max Planck Institute of Microstructure Physics, Max Planck Society;

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https://doi.org/10.1002/anie.202209486
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Citation

Zhang, J., Chen, G., Liu, Q., Fan, C., Sun, D., Tang, Y., et al. (2022). Competitive adsorption: reducing the poisoning effect of adsorbed hydroxyl on Ru single‐atom site with SnO₂ for efficient hydrogen evolution. Angewandte Chemie, International Edition in English, e202209486. doi:10.1002/anie.202209486.

Cite as: https://hdl.handle.net/21.11116/0000-000B-15A0-8

Abstract

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 (OH_ad) 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 OH_ad 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.