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Photoelectrochemical OER activity by employing BiVO4 with manganese oxide co-catalysts

Abstract

Structure-activity relationship in electrochemical OER has been studied widely, but aspects of the photoelectrochemical (PEC) O2 evolution activity with different manganese oxides is not fully explored. In the present study different manganese oxides (MnO2, MnOx (mixture of Mn3+ and Mn4+ ions), Mn2O3, Mn3O4) have been electrodeposited onto the BiVO4 photoanode as co-catalysts for PEC water splitting. We find that BiVO4-MnOx shows the lowest onset potential of 0.33 V vs RHE and the highest activity among the manganese oxides. Annealing at different temperatures results in the improvement of OER kinetics at the interface with some detrimental effect on the activity of BiVO4. Such a study may lead to useful changes in the fabrication of semiconductor thin film photoelectrodes useful for PEC water splitting.

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Publication details

The article was received on 25 Sep 2019, accepted on 03 Dec 2019 and first published on 04 Dec 2019


Article type: Paper
DOI: 10.1039/C9CP05293C
Phys. Chem. Chem. Phys., 2019, Accepted Manuscript

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    Photoelectrochemical OER activity by employing BiVO4 with manganese oxide co-catalysts

    M. Kaur, M. Chhetri and C. N. Ramachandra Rao, Phys. Chem. Chem. Phys., 2019, Accepted Manuscript , DOI: 10.1039/C9CP05293C

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