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TiO2 nanotree films for the production of green H2 by solar water splitting: From microstructural and optical characteristics to the photocatalytic properties

Miquelot, Adeline and Debieu, Olivier and Rouessac, Vincent and Villeneuve, Christina and Prud'homme, Nathalie and Cure, Jérémy and Constantoudis, Vassilios and Papavieros, George and Roualdes, Stéphanie and Vahlas, Constantin TiO2 nanotree films for the production of green H2 by solar water splitting: From microstructural and optical characteristics to the photocatalytic properties. (2019) Applied Surface Science, 494. 1127-1137. ISSN 0169-4332

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Official URL: https://doi.org/10.1016/j.apsusc.2019.07.191

Abstract

Green H2 production by solar water splitting relies entirely on the intrinsic properties of the photocatalyst. In this study the impact of these intrinsic properties on the photocatalytic activity of anatase TiO2, the quintessential component of state of the art photocatalytic systems was explored at the nanoscale. The exploration involved a holistic microstructural and optical characterization of fully crystallized anatase thin films synthetized by metalorganic chemical vapor deposition. A combination of electron microscopy, spectroscopic ellipsometry, and infrared spectroscopy revealed that when the deposition temperature increased, the morphology evolved from dense to porous and columnar nanostructures. Interestingly, the columns with a complex, tree-like nanostructure photogenerated 18 times more H2 than the densest sample. This result shows that the beneficial effect of the morphological nano-complexification and crystallographic diversification of the exchange facets on the photocatalytic performance outweighs the detrimental aspects inherent to this evolution, namely the drop of the charge carrier transport and the increase of residual stress.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > National Center for Scientific Research Demokritos - NCSR Demokritos (GREECE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Nanometrisis (GREECE)
Other partners > Université de Montpellier (FRANCE)
Other partners > Université Paris-Sud 11 (FRANCE)
Laboratory name:
Funders:
Toulouse Tech'Interlab - Association Instituts Carnot - Université de Toulouse
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Deposited By: cirimat webmestre
Deposited On:07 Oct 2019 09:33

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