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Enhanced photoelectrochemical water splitting using oxidized mass-selected Ti nanoclusters on metal oxide photoelectrodes

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posted on 13.01.2017 by Andrew McInnes, Simon R. Plant, Isabel Mecking Ornelas, Richard E. Palmer, Upul Wijayantha-Kahagala-Gamage
We report an enhancement of up to 85% in the photocurrent generated from a bismuth vanadate photoanode through the prior deposition of mass-selected Ti nanoclusters onto the semiconductor surface. We studied the effect of a variety of cluster sizes, deposited at the same density and with the same energy (1.5 keV per cluster), over the surface of separate BiVO4 photoanodes in a cluster beam source. Using mass-selected clusters of a narrow size distribution, we were able to reveal that the photocurrent is strongly dependent on the cluster size (in the size regime examined), leading to an increase of up to 85% in the photocurrent for Ti2000±54 clusters. Remarkably the quantities of metal used to achieve such an enhancement are on the 2.8 × 10−7 g cm−2 level, resulting from the optimum density which is approximately 0.4 monolayers. This work highlights the importance of submonolayer surface treatments, using accurate mass-selected nanoclusters, for the modification of semiconductor surfaces in order to improve the interfacial charge transfer properties.

Funding

This research was funded by the Engineering and Physical Research Council (Grant no. EP/G037116/1) through a PhD studentship with the Doctoral Training Centre for Hydrogen, Fuel Cells and their Applications.

History

School

  • Science

Department

  • Chemistry

Published in

Sustainable Energy and Fuels

Issue

2

Citation

MCINNES, A. ... et al, 2017. Enhanced photoelectrochemical water splitting using oxidized mass-selected Ti nanoclusters on metal oxide photoelectrodes. Sustainable Energy and Fuels, 1 (2), pp. 336-344.

Publisher

Royal Society of Chemistry / © The Authors

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 3.0 Unported (CC BY 3.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/

Acceptance date

12/12/2016

Publication date

2017-01-09

Notes

This is an Open Access article published by the Royal Society of Chemistry and distributed under the terms of the Creative Commons Attribution Licence (CC BY 3.0), http://creativecommons.org/licenses/by/3.0/

ISSN

2398-4902

Language

en

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