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Issue 3, 2015
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Factors affecting bismuth vanadate photoelectrochemical performance

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Abstract

Bismuth vanadate is a promising photoanode material, but recent reports on undoped BiVO4 without sublayers and co-catalysts showed large variations in photocurrent generation. We addressed this issue by correlating photoelectrochemical performance with physical properties. We devised a novel anodic electrodeposition procedure with iodide added to the aqueous plating bath, which allowed us to prepare BiVO4 photoanodes with virtually identical thicknesses but different morphologies, and we could control surface Bi content. Morphologies were quantified from SEM images as distributions of crystallite areas and aspect-ratio-normalised diameters, and their statistical moments were derived. We could obtain clear photocurrent generation trends only from bivariate data analysis. Our experimental evidence suggests that a combination of low Bi/V ratio, small aspect-ratio-normalised diameters, and crystallites sizes that were small enough to provide efficient charge separation yet sufficiently large to prevent mass transport limitations led to highest photoelectrochemical performance.

Graphical abstract: Factors affecting bismuth vanadate photoelectrochemical performance

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Supplementary files

Article information


Submitted
22 Aug 2014
Accepted
02 Dec 2014
First published
02 Dec 2014

Mater. Horiz., 2015,2, 330-337
Article type
Communication
Author version available

Factors affecting bismuth vanadate photoelectrochemical performance

T. S. Sinclair, B. M. Hunter, J. R. Winkler, H. B. Gray and A. M. Müller, Mater. Horiz., 2015, 2, 330
DOI: 10.1039/C4MH00156G

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