MoOX is commonly considered to be a high work-function semiconductor. From x-ray photoelectron spectroscopy and photo-electrochemical analysis, it is shown that MoOX can be considered as an effective hole transfer layer for the GaP-based device. Specifically, in the absence of carbon contamination using an ion beam cleaning step, the oxygen vacancy derived defect band located inside the bandgap becomes the main charge transfer mechanism. We demonstrate, for the first time, a device with a MoOX/GaP junction that functions as an unbiased photo-charging cell for the redox flow battery system with AQS/AQSH2∥I−/I3− redox couples. This work has important implications toward enabling MoOX applications beyond the conventional solar cells, including electrochemical energy storage and chemical conversion systems.
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31 March 2020
Research Article|
March 25 2020
Tailored energy level alignment at MoOX/GaP interface for solar-driven redox flow battery application
Special Collection:
Photocatalysis and Photoelectrochemistry
Dowon Bae
;
Dowon Bae
a)
1
Materials for Energy Conversion and Storage (MECS), Department of Chemical Engineering, Delft University of Technology
, Delft 2629HZ, The Netherlands
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Gerasimos Kanellos;
Gerasimos Kanellos
1
Materials for Energy Conversion and Storage (MECS), Department of Chemical Engineering, Delft University of Technology
, Delft 2629HZ, The Netherlands
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Kristina Wedege
;
Kristina Wedege
2
Department of Engineering, Aarhus University
, Aabogade 40, DK-8200 Aarhus, Denmark
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Emil Dražević
;
Emil Dražević
2
Department of Engineering, Aarhus University
, Aabogade 40, DK-8200 Aarhus, Denmark
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Anders Bentien
;
Anders Bentien
2
Department of Engineering, Aarhus University
, Aabogade 40, DK-8200 Aarhus, Denmark
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Wilson A. Smith
1
Materials for Energy Conversion and Storage (MECS), Department of Chemical Engineering, Delft University of Technology
, Delft 2629HZ, The Netherlands
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b)
Current address: Renewable and Sustainable Energy Institute, University of Colorado Boulder, Boulder, Colorado 80303, USA.
Note: This paper is part of the JCP Special Topic on Photocatalysis and Photoelectrochemistry.
J. Chem. Phys. 152, 124710 (2020)
Article history
Received:
November 12 2019
Accepted:
March 06 2020
Citation
Dowon Bae, Gerasimos Kanellos, Kristina Wedege, Emil Dražević, Anders Bentien, Wilson A. Smith; Tailored energy level alignment at MoOX/GaP interface for solar-driven redox flow battery application. J. Chem. Phys. 31 March 2020; 152 (12): 124710. https://doi.org/10.1063/1.5136252
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