Enhanced photocatalytic activity through anchoring and size effects of Au nanoparticles on niobate nanotubes and nanosheets for water splitting

Zhao, S., Cheng, X., Centeno, A. and Dawson, G. (2023) Enhanced photocatalytic activity through anchoring and size effects of Au nanoparticles on niobate nanotubes and nanosheets for water splitting. Optical Materials, 139, 113753. (doi: 10.1016/j.optmat.2023.113753)

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Abstract

The inorganic semiconducting potassium hexaniobate (K4Nb6O17) has a wide band gap of 3.4 eV and has been widely studied as a photocatalyst activated by the ultraviolet part of the solar spectrum. In this study, we have prepared nanotubes and nanosheets of H4Nb6O17 and attached Au nanoparticles of two different sizes to both. The resultant composites are characterised and their activity towards H2 generation by photocatalytic water splitting is investigated. We found that the morphology of the nano-niobate had minimal effect for the Au particles attached directly to the niobate, however for the (3-Aminopropyl) triethoxysilane (APTES) anchored Au particles a marked difference in their activities towards water splitting was observed. The APTES-Au-nanosheets produced a maximum volume of hydrogen of 1384.3 μmol g−1 h−1, which was much higher than the 36.9 μmol g−1 h−1 for the parent niobate nanotubes. Morphology and different interaction were considered as the main factors affecting photocatalytic efficiency.

Item Type:Articles
Additional Information:This work was supported by Suzhou Institute of Industrial Technology Research Fund (Grant No. SGYKJ201705 and 2017kyqd010), Xi'an Jiaotong Liverpool University Research Development Fund. National Natural Science Foundation of China (Grant No.21650110446).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Centeno, Dr Anthony
Authors: Zhao, S., Cheng, X., Centeno, A., and Dawson, G.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Optical Materials
Publisher:Elsevier
ISSN:0925-3467
ISSN (Online):1873-1252
Published Online:04 April 2023
Copyright Holders:Copyright © 2023 Elsevier
First Published:First published in Optical Materials 139:113753
Publisher Policy:Reproduced under a Creative Commons License

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