Modulation of electronic structure and oxygen vacancies of perovskites SrCoO3-δ by sulfur doping enables highly active and stable oxygen evolution reaction. (10th September 2021)

• Record Type: Journal Article
• Authors: Wang, Xiaoyu; Liu, Hao; Li, Mingze; Li, Jun; Lu, Yi; Wang, Lixi; Wang, Zhihong; Zhang, Xinping; Ding, Xifeng
• Is Part Of: Electrochimica acta. Volume 390(2021)
• Publication Date: 2021-09-10
• Subjects: Non-metallic element doping -- Electrocatalyst -- Oxygen evolution reaction -- Perovskite; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2021.138872
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Resolving the energy crisis and advancing the commercialization of electrochemical conversion devices is urgent tasks nowadays. Developing cost-effective electrocatalysts for oxygen evolution reaction (OER) is of foremost importance for these electrochemical conversion devices. Herein, we developed a non-metallic and cost-effective sulfur-doped SrCoO3-δ perovskite electrocatalyst, namely SrCoO3- x S x ( x = 0.02, 0.04, 0.06, 0.08 and 0.1, denoted as SCS2, SCS4, SCS6, SCS8 and SCS10, respectively) for water splitting in alkaline solution. Sulfur doping results in a structural change of SrCoO3-δ perovskite from hexagonal to cubic perovskite. The electrochemical performance of this catalyst indicates that an optimal sulfur doping could enhance the conductivity of SrCoO3-δ, resulting in a remarkable improvement on OER activity. The DFT calculation also confirm S doping can improve the electron conduction by lowering the activation energy of electron conductivity. Moreover, the doped SrCoO3- x S x also show enhanced durability due to the stable cubic structure with sulfur substitution. This work offers an inexpensive doping strategy for SrCoO3-δ perovskite as an efficient electrocatalyst for the enhanced electrochemical performance of OER activity in water splitting.