Rapid Surface Reconstruction of Amorphous Co(OH)2/WOx with Rich Oxygen Vacancies to Promote Oxygen Evolution. Issue 24 (23rd November 2021)

• Record Type: Journal Article
• Authors: Li, Sijun; Wang, Hua; Ma, Zemian; Xiao, Qinglan; Gao, Qin; Jiang, Yimin; Shen, Wei; He, Rongxing; Li, Ming
• Is Part Of: ChemSusChem. Volume 14:Issue 24(2021)
• Page Start: 5534
• Page End: 5540
• Publication Date: 2021-11-23
• Subjects: electrocatalysis -- electrodeposition -- oxygen evolution -- oxygen vacancy engineering -- water oxidation; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.202102020
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: Herein, a transition metal dissolution‐oxygen vacancy strategy, based on dissolution of highly oxidized transition metal species in alkaline electrolyte, was suggested to construct a high‐performance amorphous Co(OH)2 /WO x (a‐CoW) catalyst for the oxygen evolution reaction (OER). The surface reconstruction of a‐CoW and its evolution were described by regulating oxygen vacancies. With continuous dissolution of W species, oxygen vacancies on the surface were generated rapidly, the surface reconstruction was promoted, and the OER performance was improved significantly. During the surface reconstruction, W species also played a role in electronic modulation for Co. Due to its rapid surface reconstruction, a‐CoW exhibited excellent OER performance in alkaline electrolyte with an overpotential of 208 mV at 10 mA cm −2 and had long‐term stability for at least 120 h. This work shows that the transition metal dissolution‐oxygen vacancy strategy is effective for preparation of high‐performance catalysts. Abstract : Vacancy : A transition metal dissolution‐oxygen vacancy strategy is suggested to construct the high‐performance a‐CoW catalyst for the oxygen evolution reaction (OER). With continuous dissolution of W species, oxygen vacancies on the surface are generated rapidly, surface reconstruction is promoted, and OER performance is improved significantly.