Journal
NANO ENERGY
Volume 58, Issue -, Pages 778-785Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2019.01.094
Keywords
Transition metal oxides; Structure reconstruction; Electrochemical leaching; Oxygen vacancies; Oxygen evolution reaction
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Funding
- National Natural Science Foundation of China [51872035, U1508201]
- National Key Research Development Program of China [2016YFB0101201]
- China Scholarship Council (CSC)
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Cobalt oxides with abundant defects, including those with fully exposed active sites and abundant oxygen vacancies, exhibit superb catalytic activities towards oxygen evolution reaction (OER). Herein, we report a facile in-situ electrochemical self-optimization strategy to produce carbon-fiber-supported defective CoOx (E-CoOx/CF), in which the partial self-dissolution of acidic oxides under alkaline OER operational conditions and releasing of in-situ generated oxygen molecules are taken as advantages for reconstruction of Co species with abundant defects, Co2+ and oxygen vacancies. The resultant E-CoOx/CF can achieve 10 mA cm(-2) at a low overpotential of 249 mV with a remarkable stability (> 100 h without performance decay). Moreover, this electrochemical etching method can also be extended to the preparation of highly active transition metal nickel oxides for enhanced OER. This study represents a new yet efficient strategy for rationally designing and developing advanced transition metal oxides for various electrochemical applications and beyond.
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