Tailored energy level alignment at MoOX/GaP interface for solar-driven redox flow battery application

Dowon Bae; Gerasimos Kanellos; Kristina Wedege; Emil Dražević; Anders Bentien; Wilson Smith

doi:10.1063/1.5136252

Tailored energy level alignment at MoOX/GaP interface for solar-driven redox flow battery application

Dowon Bae, Gerasimos Kanellos, Kristina Wedege, Emil Dražević, Anders Bentien, Wilson Smith

ChemE/Materials for Energy Conversion and Storage

Research output: Contribution to journal › Article › Scientific › peer-review

7 Citations (Scopus)

Abstract

MoOX is commonly considered to be a high work-function semiconductor. From x-ray photoelectron spectroscopy and photoelectrochemical 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.

Original language	English
Article number	124710
Number of pages	9
Journal	Journal of Chemical Physics
Volume	152
Issue number	12
DOIs	https://doi.org/10.1063/1.5136252
Publication status	Published - 2020

Keywords

Redox flow battery
photoelectrochemical cells
gallium phosphide
Molybdenum oxide
Solar redox flow battery
photoelectrochemistry
Energy storage

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10.1063/1.5136252

Cite this

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abstract = "MoOX is commonly considered to be a high work-function semiconductor. From x-ray photoelectron spectroscopy and photoelectrochemical 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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year = "2020",

doi = "10.1063/1.5136252",

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journal = "Journal of Chemical Physics",

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T1 - Tailored energy level alignment at MoOX/GaP interface for solar-driven redox flow battery application

AU - Bae, Dowon

AU - Kanellos, Gerasimos

AU - Wedege, Kristina

AU - Dražević, Emil

AU - Bentien, Anders

AU - Smith, Wilson

PY - 2020

Y1 - 2020

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AB - MoOX is commonly considered to be a high work-function semiconductor. From x-ray photoelectron spectroscopy and photoelectrochemical 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.

KW - Redox flow battery

KW - photoelectrochemical cells

KW - gallium phosphide

KW - Molybdenum oxide

KW - Solar redox flow battery

KW - photoelectrochemistry

KW - Energy storage

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U2 - 10.1063/1.5136252

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JF - Journal of Chemical Physics

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Tailored energy level alignment at MoOX/GaP interface for solar-driven redox flow battery application

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Tailored energy level alignment at MoOX/GaP interface for solar-driven redox flow battery application

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