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TiO2-Polyheptazine Hybrid Photoanodes for Visible Light-Driven Water Splitting: The Effect of External Bias

Published online by Cambridge University Press:  13 June 2012

Michal Bledowski ,
Lidong Wang ,
Ayyappan Ramakrishnan  and
Radim Beranek
Michal Bledowski
Affiliation:
Faculty of Chemistry and Biochemistry, Ruhr University Bochum, 44780 Bochum, Germany
Lidong Wang
Affiliation:
Faculty of Chemistry and Biochemistry, Ruhr University Bochum, 44780 Bochum, Germany
Ayyappan Ramakrishnan
Affiliation:
Faculty of Chemistry and Biochemistry, Ruhr University Bochum, 44780 Bochum, Germany
Radim Beranek
Affiliation:
Faculty of Chemistry and Biochemistry, Ruhr University Bochum, 44780 Bochum, Germany
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Abstract

Visible (λ > 420 nm) light-driven photooxidation of water at TiO2-polyheptazine (TiO2-PH) hybrid photoanodes loaded with two different metal oxide co-catalysts was investigated in a twoelectrode setup. As compared to TiO2-PH photoanodes loaded with colloidal IrO2, photoelectrodes modified with photodeposited CoOx oxygen-evolving co-catalyst (Co-Pi) showed both higher photocurrents and more efficient oxygen evolution. The minimum external electric bias needed to observe complete photooxidation of water to dioxygen at TiO2-PH photoanodes modified with Co-Pi was estimated to be ca. 0.6 V at pH 7.

Keywords

photochemicalnanostructurecatalytic

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1442: Symposium Q – Titanium Dioxide Nanomaterials—2012 , 2012 , mrss12-1442-q02-08
Copyright
Copyright © Materials Research Society 2012

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