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- Title
Activating and Identifying the Active Site of RuS<sub>2</sub> for Alkaline Hydrogen Oxidation Electrocatalysis.
- Authors
Yang, Chaoyi; Yue, Jianchao; Wang, Guangqin; Luo, Wei
- Abstract
Searching for highly efficient and economical electrocatalysts for alkaline hydrogen oxidation reaction (HOR) is crucial for the development of alkaline polymer membrane fuel cells. Here, we report a valid strategy to active pyrite‐type RuS2 for alkaline HOR electrocatalysis by introducing sulfur vacancies. The obtained S‐vacancies modified RuS2−x exhibits outperformed HOR activity with a current density of 0.676 mA cm−2 and mass activity of 1.43 mA μg−1, which are 15‐fold and 40‐fold improvement than those of Ru catalyst. In situ Raman spectra demonstrate the formation of S−H bond during the HOR process, identifying the S atom of RuS2−x is the real active site for HOR catalysis. Density functional theory calculations and experimental results including in situ surface‐enhanced infrared absorption spectroscopy suggest the introduction of S vacancies can rationally modify the p orbital of S atoms, leading to enhanced binding strength between the S sites and H atoms on the surface of RuS2−x, together with the promoted connectivity of hydrogen‐bonding network and lowered water formation energy, contributes to the enhanced HOR performance.
- Subjects
HYDROGEN oxidation; ELECTROCATALYSIS; INFRARED absorption; RAMAN spectroscopy; RUTHENIUM catalysts; INFRARED spectroscopy
- Publication
Angewandte Chemie, 2024, Vol 136, Issue 17, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202401453