期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 315, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121554
关键词
Cobalt; Core-shell; Alloy; Electrocatalysis; Hydrogen evolution
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2019M3E6A1063671, 2020R1A2C3004146, 2021M3D1A2 051605]
- Brain Pool Program through NRF - Ministry of Science and ICT [2020H1D3A1A02081018]
- National Research Foundation of Korea [2020H1D3A1A02081018] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this study, a self-standing catalyst with core-shell structure composed of metallic Co nanoparticles coated by RuCo alloy layer was synthesized. The catalyst exhibited high catalytic activity and stability in alkali and seawater conditions.
Hydrogen evolution reaction (HER) in alkali involves higher energy barriers and slow reaction kinetics due to involving water dissociation process. Catalysts with proper surface properties are highly needed to optimize the surface binding energy with reaction intermediates and enhance intrinsic catalytic activity. Herein, we present an effective strategy to construct a self-standing catalyst with core-shell structure, which is composited of metallic Co nanoparticles coated by RuCo alloy layer with optimized surface properties. The Ru attracts electrons from Co and optimizes the surface electronic structure. Theoretical calculations demonstrate that the water dissociation barrier on the Co surface is decreased from 0.65 eV to 0.58 eV after alloying with Ru. Experimental results reveal that the synthesized Co@RuCo-3 features highly efficient catalytic activity together with good stability at large current densities for HER in alkali, as well as in alkaline seawater and pure seawater.
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