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Rapid Activation of Co3O4 Cocatalyst with Oxygen Vacancies on TiO2 Photoanodes for Highly Efficient Water Splitting

Abstract

Cobalt oxide (Co3O4) has been extensively utilized as a promising oxygen evolution reaction (OER) cocatalyst for solar photoelectrochemical (PEC) water splitting. However, the relationship between its oxygen vacancy and PEC conversion efficiency has yet to be determined. Herein, we demonstrate a rapid and highly efficient strategy for rationally constructing oxygen vacancies on Co3O4 cocatalysts by Ar-plasma treatment, which could significantly enhance the PEC water oxidation reactivity of TiO2-based photoanode. The photocurrent density could be achieved up to 2.5 mA cm-2 (1.23 VRHE) under the AM 1.5G irradiation (100 mW cm-2), up to 2 times higher than that of the untreated Co3O4/TiO2 samples. More specifically, the oxygen vacancy formation on Co3O4 cocatalyst not only facilitates the hole trapping ability for promoting interfacial charge separation and migration, but also provides more active sites for water oxidation. The rapid and highly efficient activation of OER cocatalyst by producing oxygen vacancy may be potentially a universal strategy for improving the photo-conversion efficiency of the PEC photoanodes now available.

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Publication details

The article was received on 28 Aug 2018, accepted on 30 Sep 2018 and first published on 01 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA08342H
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Rapid Activation of Co3O4 Cocatalyst with Oxygen Vacancies on TiO2 Photoanodes for Highly Efficient Water Splitting

    Y. Bi, G. dong, H. Hu, X. Huang and Y. Zhang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA08342H

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