Competitive Adsorption Mechanism of Defect‐Induced d‐Orbital Single Electrons in SrRuO3 for Alkaline Hydrogen Evolution Reaction

Author:

Pan Shencheng1ORCID,Yang Xiaolong1,Sun Jingwen1,Wang Xin1,Zhu Junwu1,Fu Yongsheng1ORCID

Affiliation:

1. Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education Nanjing University of Science and Technology Nanjing 210094 P. R. China

Abstract

AbstractIn the alkaline hydrogen evolution reaction (HER), the dissociation energy barrier of water, and the easy adsorption of OH on the catalyst are key factors that limit the catalytic activity. This work proposes a novel competing adsorption mechanism driven by dz2 electrons in the context of the alkaline HER. The high concentration of oxygen vacancies in Co doped SrRuO3 (V‐SRCO) results in the electron filling in the Ru 4dz2 orbital. Under alkaline conditions, the V‐SRCO exhibits a low overpotential of only 57.8 mV with a Tafel slope of 35 mV dec−1. Moreover, it exhibits sustained high activity for 60 h. The high HER activity of V‐SRCO can be attributed to the presence of a single electron in the dz2 orbital, which reduces the energy barrier for water dissociation. More importantly, the active electrons in the dz2 orbital can inject into the antibonding orbitals of OH, creating an unfavorable environment for OH adsorption on the catalyst. This work provides favorable conditions for efficient HER.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

General Materials Science,Renewable Energy, Sustainability and the Environment

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