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Issue 4, 2014
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Al-doped ZnO inverse opal networks as efficient electron collectors in BiVO4 photoanodes for solar water oxidation

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Abstract

The short diffusion length of photogenerated charge carriers limits the performance of photoelectrodes for solar water splitting. To reduce the distance between where the charges are generated and the location they are scavenged, a conductive Al-doped ZnO inverse opal network is introduced into a BiVO4 photoanode. The conductive inverse opal network serves as an electron collector for the BiVO4 film, which suffers from poor electron transport. The combined heterostructure provides a photocurrent of 1.5 mA cm−2 at 1.23 V vs. RHE, which is threefold higher than a BiVO4 photoanode without any conducting inverse opal network. The significantly enhanced photocurrent produced without intentional doping or oxygen-evolving catalysts, indicates the importance of charge transport and collection in photoelectrodes. Our design has the potential to be applied to other photoelectrochemical systems to improve charge collection and solar energy conversion efficiency.

Graphical abstract: Al-doped ZnO inverse opal networks as efficient electron collectors in BiVO4 photoanodes for solar water oxidation

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Supplementary files

Article information


Submitted
12 Dec 2013
Accepted
24 Feb 2014
First published
24 Feb 2014

This article is Open Access

Energy Environ. Sci., 2014,7, 1402-1408
Article type
Communication
Author version available

Al-doped ZnO inverse opal networks as efficient electron collectors in BiVO4 photoanodes for solar water oxidation

L. Zhang, E. Reisner and J. J. Baumberg, Energy Environ. Sci., 2014, 7, 1402
DOI: 10.1039/C3EE44031A

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