4.8 Article

Rapid Surface Reconstruction of Amorphous Co(OH)2/WOx with Rich Oxygen Vacancies to Promote Oxygen Evolution

Journal

CHEMSUSCHEM
Volume 14, Issue 24, Pages 5534-5540

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202102020

Keywords

electrocatalysis; electrodeposition; oxygen evolution; oxygen vacancy engineering; water oxidation

Funding

  1. National Natural Science Foundation of China [91741105, 21173169]
  2. Chongqing Municipal Natural Science Foundation [cstc2018jcyjAX0625]
  3. Program for Innovation Team Building at Institutions of Higher Education in Chongqing [CXTDX201601011]

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The study suggests a transition metal dissolution-oxygen vacancy strategy, utilizing highly oxidized transition metal species dissolved in alkaline electrolyte, to construct a high-performance amorphous Co(OH)(2)/WOx (a-CoW) catalyst for the oxygen evolution reaction (OER). By regulating oxygen vacancies on the surface, the OER performance can be significantly improved.
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)/WOx (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 mAcm(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.

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