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Issue 13, 2016
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Understanding the synergistic effect of WO3–BiVO4 heterostructures by impedance spectroscopy

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Abstract

WO3–BiVO4 n–n heterostructures have demonstrated remarkable performance in photoelectrochemical water splitting due to the synergistic effect between the individual components. Although the enhanced functional capabilities of this system have been widely reported, in-depth mechanistic studies explaining the carrier dynamics of this heterostructure are limited. The main goal is to provide rational design strategies for further optimization as well as to extend these strategies to different candidate systems for solar fuel production. In the present study, we perform systematic optoelectronic and photoelectrochemical characterization to understand the carrier dynamics of the system and develop a simple physical model to highlight the importance of the selective contacts to minimize bulk recombination in this heterostructure. Our results collectively indicate that while BiVO4 is responsible for the enhanced optical properties, WO3 controls the transport properties of the heterostructured WO3–BiVO4 system, leading to reduced bulk recombination.

Graphical abstract: Understanding the synergistic effect of WO3–BiVO4 heterostructures by impedance spectroscopy

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Supplementary files

Article information


Submitted
22 Dec 2015
Accepted
23 Feb 2016
First published
29 Feb 2016

Phys. Chem. Chem. Phys., 2016,18, 9255-9261
Article type
Paper
Author version available

Understanding the synergistic effect of WO3–BiVO4 heterostructures by impedance spectroscopy

X. Shi, I. Herraiz-Cardona, L. Bertoluzzi, P. Lopez-Varo, J. Bisquert, J. H. Park and S. Gimenez, Phys. Chem. Chem. Phys., 2016, 18, 9255
DOI: 10.1039/C5CP07905E

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