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.
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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 |
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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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