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| Home > Articles > Published articles > A direct Z-Scheme for the photocatalytic hydrogen production from a water ethanol mixture on CoTiO3/TiO2 heterostructures |
(Institut de Recerca en Energia de Catalunya) (École Polytechnique Fédérale de Lausanne. Laboratory for Molecular Engineering of Optoelectronic Nanomaterials) (Institut de Recerca en Energia de Catalunya) (Institut de Recerca en Energia de Catalunya) (Institut Català d'Energia de Catalunya) (Institut Català de Nanociència i Nanotecnologia) (Universitat Politècnica de Catalunya. Departament d'Enginyeria Química) (École Polytechnique Fédérale de Lausanne. Laboratory for Molecular Engineering of Optoelectronic Nanomaterials) (École Polytechnique Fédérale de Lausanne. Laboratory for Molecular Engineering of Optoelectronic Nanomaterials) (Institució Catalana de Recerca i Estudis Avançats) (Universitat Politècnica de Catalunya. Departament d'Enginyeria Química)
| Additional title: | A direct Z-scheme for the photocatalytic hydrogen production from ethanol dehydrogenation on CoTiO3/TiO2 heterostructures |
| Date: | 2021 |
| Abstract: | Photocatalytic H2 evolution from ethanol dehydrogenation is a convenient strategy to store solar energy in a highly valuable fuel with potential zero net CO2 balance. Herein, we report on the synthesis of CoTiO3/TiO2 composite catalysts with controlled amounts of highly distributed CoTiO3 nanodomains for photocatalytic ethanol dehydrogenation. We demonstrate these materials to provide outstanding hydrogen evolution rates under UV and visible illumination. The origin of this enhanced activity is extensively analyzed. In contrast to previous assumptions, UV-vis absorption spectra and ultraviolet photoelectron spectroscopy (UPS) prove CoTiO3/TiO2 heterostructures to have a type II band alignment, with the conduction band minimum of CoTiO3 below the H2/H+ energy level. Additional steady-state photoluminescence (PL) spectra, time-resolved PL spectra (TRPLS), and electrochemical characterization prove such heterostructures to result in enlarged lifetimes of the photogenerated charge carriers. These experimental evidence point toward a direct Z-scheme as the mechanism enabling the high photocatalytic activity of CoTiO3/TiO2 composites toward ethanol dehydrogenation. In addition, we probe small changes of temperature to strongly modify the photocatalytic activity of the materials tested, which could be used to further promote performance in a solar thermophotocatalytic reactor. |
| Grants: | Ministerio de Ciencia e Innovación RTI2018-093996-B-C31 Ministerio de Ciencia e Innovación FEDER/RTI2018-095498-J-I00 Ministerio de Economía y Competitividad ENE2017-85087-C3 Ministerio de Economía y Competitividad SEV-2013-0295 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-327 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-128 |
| Note: | El títol alternatiu correspon al preprint de l'article publicat. |
| Note: | Altres ajuts: ICN2 thanks the support from the CERCA program/Generalitat de Catalunya. Part of the present work has been performed in the framework of the Universitat Autónoma de Barcelona Materials Science PhD program. |
| Rights: | Tots els drets reservats.  |
| Language: | Anglès |
| Document: | Article ; recerca ; Versió sotmesa a revisió |
| Subject: | Bioethanol ; Photocatalysis ; Hydrogen ; Titanium dioxide ; Z-scheme ; Titanate ; Dehydrogenation |
| Published in: | ACS applied materials & interfaces, Vol. 13, issue 1 (Jan. 2021) , p. 449-457, ISSN 1944-8252 |
22 p, 2.1 MB |
