期刊
ACS CATALYSIS
卷 12, 期 19, 页码 12458-12468出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.2c03476
关键词
neighboring cationic vacancies; Ru single atoms; hydrogen bonding; adsorption configuration; oxygen evolution reaction
资金
- National Key Research and Development Program of China [2017YFA0403402, 2019YFA0405602, 2019YFA0405600, 2021YFA1500500]
- NSFC [21972132, U19A2015, 21673214, 92045301, U1732149, U1732272]
- National Science Fund for Distinguished Young Scholars [21925204]
- Fundamental Research Funds for the Central Universities [20720220010]
- Provincial Key Research and Development Program of Anhui [202004a05020074]
- K. C. Wong Education [GJTD-2020-15]
- DNL Cooperation Fund, CAS [DNL202003]
- Users with Excellence Program of Hefei Science Center CAS [2020HSC-UE001]
- USTC Research Funds of the Double First-Class Initiative [YD2340002002]
- Anhui Natural Science Foundation for Young Scholars [2208085QB52, 2208085QB41]
- CAS Project for Young Scientists in Basic Research [YSBR-051]
Single-atom catalysts with particular neighboring geometry can enhance the activity of reaction intermediates and improve catalytic performance. In this study, a neighboring cationic vacancy strategy in single-atom Ru catalysts was proposed to adjust the adsorption configuration of reaction intermediates for improved oxygen evolution performance. Experimental and computational results confirmed the effectiveness of this strategy.
Single-atom catalysts with particular electronic and geometric microenvironments provide an atomic-scale perspective for research into the mechanism of catalysis. Designing the neighboring geometry of single-atom catalysts can tailor the adsorption configuration of reaction intermediates and enhance their activity in catalytic reactions. In this work, we proposed a neighboring cationic vacancy strategy in single-atom Ru catalysts to adjust the adsorption configuration of reaction intermediates for improved oxygen evolution performance. An Ru single-atom catalyst with neighboring Co2+ vacancies (Ru1/VCo-Co(OH)2) showed better OER performance than a catalyst without Co2+ vacancies (Ru1/Co(OH)2). The mass activity of Ru1/VCo-Co(OH)2 was calculated to be 6688 A g-1 at 300 mV overpotential, which was 4.73 times higher than that of Ru1/Co(OH)2. Particularly, the mass activity of Ru1/VCo-Co(OH)2 was notably 481.15 times higher than that of commercial RuO2. Both in situ ATR-FTIR spectroscopy measurements and DFT calculations manifested that the existence of neighboring Co2+ vacancies modulated the adsorption configuration of *OOH intermediates on atomic Ru sites by hydrogen bonding, which reduced the energy barrier of rate determining steps and improved the OER activity.
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