1. Quenching-induced anion defects and precise Ru doping on Co3O4/CoN heterostructures for efficient overall water splitting performance.
- Author
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Li, Shuangshuang, Liu, Jie, Du, Yunmei, Wang, Mengmeng, Gu, Yuanxiang, Chen, Dehong, Zhang, Ruiyong, and Wang, Lei
- Subjects
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OXYGEN evolution reactions , *HYDROGEN evolution reactions , *DENSITY functional theory , *ACTIVATION energy , *ADSORPTION capacity - Abstract
Ru-Co 3 O 4 /CoN-L electrode with abundant anion defects (V N and V O) and Ru dopants was proposed for the first time by utilizing the 'gas phase nitridation-quenching Ru' strategy. Surprisingly, thanks to the structure of twisted nanoneedles, abundant Ru dopants and anion defects, the Ru-Co 3 O 4 /CoN/NF-L exhibits exceptional HER and OER properties beyond notal-metals. [Display omitted] The difficulty of nitride modification is to develop simple and efficient strategies to induce defects and efficiently capture Ru atoms. With these in mind, this work innovatively constructed a Ru-Co 3 O 4 /CoN-L catalyst with abundant anion defects (oxygen vacancies (V O) and nitrogen vacancies (V N)) using the nitridation-quenching-Ru doping strategy. Surprisingly, the porous structure provided more active sites, and the V N and V O were conducive to promoting the anchoring of Ru atoms. These significantly improved the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performances of the Ru-Co 3 O 4 /CoN/NF-L catalyst. The density functional theory results showed that the anion defects optimized the hydrogen adsorption capacity of the Ru active sites for the HER. Furthermore, Ru dopants and anion defects reduced the OER energy barrier of the Co-active sites, accelerating the HER and OER kinetics. This study proposes a new concept for defect construction and nitride-structure optimization. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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