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Co3O4 Nanopetals on Si as Photoanodes for the Oxidation of Organics

1
Department of Chemical Sciences, University of Padova, via Marzolo 1, 35121 Padova, Italy
2
Physics and Astronomy Department, University of Padova, via Marzolo 6, 35121 Padova, Italy
*
Author to whom correspondence should be addressed.
Surfaces 2019, 2(1), 41-53; https://doi.org/10.3390/surfaces2010004
Received: 13 November 2018 / Revised: 8 January 2019 / Accepted: 9 January 2019 / Published: 11 January 2019
(This article belongs to the Special Issue Electrochemical Surface Science: Basics and Applications)
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Abstract

Cobalt oxide nanopetals were grown on silicon electrodes by heat-treating metallic cobalt films deposited by DC magnetron sputtering. We show that cobalt oxide, with this peculiar nanostructure, is active towards the photo-electrochemical oxidation of water as well as of organic molecules, and that its electrochemical properties are directly linked to the structure of its surface. The formation of Co3O4 nanopetals, induced by oxidizing annealing at 300 °C, considerably improves the performance of the material with respect to simple cobalt oxide films. Photocurrent measurements and electrochemical impedance are used to explain the behavior of the different structures and to highlight their potential application in water remediation technologies. View Full-Text
Keywords: cobalt oxide; water oxidation; photo-electrochemistry; hydroxyl radical; electro-oxidation cobalt oxide; water oxidation; photo-electrochemistry; hydroxyl radical; electro-oxidation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Girardi, L.; Bardini, L.; Michieli, N.; Kalinic, B.; Maurizio, C.; Rizzi, G.A.; Mattei, G. Co3O4 Nanopetals on Si as Photoanodes for the Oxidation of Organics. Surfaces 2019, 2, 41-53.

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