期刊
SCIENCE CHINA-MATERIALS
卷 64, 期 6, 页码 1408-1417出版社
SCIENCE PRESS
DOI: 10.1007/s40843-020-1536-6
关键词
electrocatalyst; oxygen evolution reaction; single atom; ruthenium; electronic coupling
资金
- Taishan Scholar Program of Shandong Province, China [ts201712045]
- Shandong Provincial Key Research and Development Program [2019GGX102069]
- Natural Science Foundation of Shandong Province of China [ZR2018BB008]
- Doctoral Found of Qingdao University of Science and Technology [0100229001, 010029081]
- Ulsan National Institute of Science and Technology, South Korea [1.190002.01]
- National Research Foundation of Korea [PAL-2021] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The study reveals that the strong electronic coupling between single-atom Ru and Co(OH)F can suppress the excessive oxidation of Ru into higher valence states under high OER potential, stabilizing single-atom Ru and enhancing the activity and durability for OER.
Electronic coupling with the support plays a crucial role in boosting the intrinsic catalytic activity of a single-atom catalyst. Herein, the three-dimensional (3D) hierarchical Co(OH)F nanosheet arrays modified by singleatom Ru (SA-Ru/Co(OH)F) are prepared by a facile one-step hydrothermal method under mild conditions, which exhibit excellent activity with an overpotential of 200 and 326 mV at 10 and 500 mA cm(-2), respectively, as well as robust stability for oxygen evolution reaction (OER) in 1.0 mol L-1 KOH electrolyte. The study of electronic structures and surface chemical states before and after OER testing reveals that the strong electronic coupling between single-atom Ru and Co(OH)F induces the charge redistribution in SA-Ru/Co(OH)F and suppresses the excessive oxidation of Ru into higher valence state (more than +4) under high OER potential. This work provides a strategy to stabilize single-atom Ru by Co(OH)F that can enhance the activity and durability for OER under large current densities.
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