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

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

Bae, D. (TU Delft ChemE/Materials for Energy Conversion and Storage)
Kanellos, Gerasimos (Student TU Delft)
Wedege, Kristina (Aarhus University)
Dražević, Emil (Aarhus University)
Bentien, Anders (Aarhus University)
Smith, W.A. (TU Delft ChemE/Materials for Energy Conversion and Storage)

2020

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.

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

http://resolver.tudelft.nl/uuid:95bb1973-06ff-48c2-96aa-34e2f6a37cfe

https://doi.org/10.1063/1.5136252

0021-9606

Journal of Chemical Physics, 152 (12)

Institutional Repository

journal article

© 2020 D. Bae, Gerasimos Kanellos, Kristina Wedege, Emil Dražević, Anders Bentien, W.A. Smith