Multilayer hollow MnCo2O4 microsphere with oxygen vacancies as efficient electrocatalyst for oxygen evolution reaction

Kai Zeng, Wei Li, Yu Zhou, Zhihui Sun, Chengyi Lu, Jin Yan, Jin Ho Choi, Ruizhi Yang

科研成果: 期刊稿件文章同行评审

130 引用 (Scopus)

摘要

Highly efficient and stable electrocatalysts for oxygen evolution reaction are of technological importance in energy conversion and storage. Surface modification is one of the most promising strategies for improving the activity of such electrocatalysts. Herein, we report the multilayer hollow MnCo2O4 microsphere enriched with oxygen vacancies induced by the plasma-engraving technique for the first time. The defective MnCo2O4 microsphere exhibits an excellent catalytic activity and durability as compared to pristine MnCo2O4. Our electrochemical analysis, combined with first-principles calculations, reveals that the improved electrocatalytic performance is attributed mainly to abundant active sites after the plasma treatment and the effects of the introduced oxygen vacancies. The oxygen vacancy not only reduces the density of states near the Fermi level but also lowers the Co d-band center, weakening the adsorption of the intermediates. This facilitates the desorption of the adsorbates, which is necessary for oxygen evolution reaction.

源语言英语
文章编号127831
期刊Chemical Engineering Journal
421
DOI
出版状态已出版 - 1 10月 2021
已对外发布

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