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A Hierarchical 3D TiO₂/Ni Nanostructure as an Efficient Hole‐Extraction and Protection Layer for GaAs Photoanodes

Alqahtani, M; Kafizas, A; Sathasivam, S; Ebaid, M; Cui, F; Alyamani, A; Jeong, H-H; ... Wu, J; + view all (2020) A Hierarchical 3D TiO₂/Ni Nanostructure as an Efficient Hole‐Extraction and Protection Layer for GaAs Photoanodes. ChemSusChem , 13 (22) pp. 6028-6036. 10.1002/cssc.202002004. Green open access

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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.

Type: Article
Title: A Hierarchical 3D TiO₂/Ni Nanostructure as an Efficient Hole‐Extraction and Protection Layer for GaAs Photoanodes
Location: Germany
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/cssc.202002004
Publisher version: https://doi.org/10.1002/cssc.202002004
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: GaAs, nanorods, photoanodes, transient-absorption spectroscopy, water splitting.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office > Institute for Materials Discovery
URI: https://discovery.ucl.ac.uk/id/eprint/10117783
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