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Journal Article

A hierarchical 3D TiO2/Ni nanostructure as an efficient hole‐extraction and protection layer for GaAs photoanodes

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Fischer,  Peer
Optical Nanoscopy, Max Planck Institute for Medical Research, Max Planck Society;

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https://chemistry-europe.onlinelibrary.wiley.com/doi/epdf/10.1002/cssc.202002004
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https://chemistry-europe.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1002%2Fcssc.202002004&file=cssc202002004-sup-0001-misc_information.pdf
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Citation

Alqahtani, M., Kafizas, A., Sathasivam, S., Ebaid, M., Cui, F., Alyamani, A., et al. (2020). A hierarchical 3D TiO2/Ni nanostructure as an efficient hole‐extraction and protection layer for GaAs photoanodes. ChemSusChem, 13(22), 6028-6036. doi:10.1002/cssc.202002004.


Cite as: https://hdl.handle.net/21.11116/0000-000B-3801-5
Abstract
Photoelectrochemical (PEC) water splitting is a promising clean route to hydrogen fuel. The best-performing materials (III/V semiconductors) require surface passivation, as they are liable to corrosion, and a surface co-catalyst to facilitate water splitting. At present, optimal design combining photoelectrodes with oxygen evolution catalysts remains a significant materials challenge. Here, we demonstrate that nickel-coated amorphous three-dimensional (3D) TiO2 core-shell nanorods on a TiO2 thin film function as an efficient hole-extraction layer and serve as a protection layer for the GaAs photoanode. Transient-absorption spectroscopy (TAS) demonstrated the role of nickel-coated (3D) TiO2 core-shell nanorods in prolonging photogenerated charge lifetimes in GaAs, resulting in a higher catalytic activity. This strategy may open the potential of utilizing this low-cost (3D) nanostructured catalyst for decorating narrow-band-gap semiconductor photoanodes for PEC water splitting devices.