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Electrochemical Oxidation Encapsulated Ru Clusters Enable Robust Durability for Efficient Oxygen Evolution.
Hou, Zhiqian; Cui, Chenghao; Yang, Yanan; Zhang, Tao.
Afiliação
  • Hou Z; State Key Lab of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai, 200050, P. R. China.
  • Cui C; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
  • Yang Y; State Key Lab of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai, 200050, P. R. China.
  • Zhang T; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Small ; 19(29): e2207170, 2023 Jul.
Article em En | MEDLINE | ID: mdl-37021723
Electrochemical oxidization and thermodynamic instability agglomeration are a primary challenge in triggering metal-support interactions (MSIs) by immobilizing metal atoms on a carrier to achieve efficient oxygen evolution reactions (OER). Herein, Ru clusters anchored to the VS2 surface and the VS2 nanosheets embedded vertically in carbon cloth (Ru-VS2 @CC) are deliberately designed to realize high reactivity and exceptional durability. In situ Raman spectroscopy reveals that the Ru clusters are preferentially electro-oxidized to form RuO2 chainmail, both affording sufficient catalytic sites and protecting the internal Ru core with VS2 substrates for consistent MSIs. Theoretical calculations elucidate that electrons across the Ru/VS2 interface aggregate toward the electro-oxidized Ru clusters, while the electronic coupling of Ru 3p and O 2p orbitals boosts a positive shift in the Fermi energy level of Ru, optimizing the adsorption capacity of the intermediates and diminishing the migration barriers of the rate-determining steps. Therefore, the Ru-VS2 @CC catalyst demonstrated ultra-low overpotentials of 245 mV at 50 mA cm-2 , while the zinc-air battery maintained a narrow gap (0.62 V) after 470 h of reversible operation. This work has transformed the corrupt into the miraculous and paved a new way for the development of efficient electrocatalysts.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Small Assunto da revista: ENGENHARIA BIOMEDICA Ano de publicação: 2023 Tipo de documento: Article País de publicação: Alemanha

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Small Assunto da revista: ENGENHARIA BIOMEDICA Ano de publicação: 2023 Tipo de documento: Article País de publicação: Alemanha