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A direct Z-scheme for the photocatalytic hydrogen production from a water ethanol mixture on CoTiO3/TiO2 heterostructures

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10.1021/acsami.0c17004
 
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hdl:2117/344795

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Xing, Congcong
Liu, Yongpeng
Zhang, Yu
Wang, Xiang
Guardia, Pablo
Yao, Liang
Han, Xu
Zhang, Ting
Arbiol Cobos, Jordi
Soler Turu, LluísMés informacióMés informacióMés informació
Chen, Yufen
Sivula, Kevin
Guijarro, Néstor
Cabot, Andreu
Llorca Piqué, JordiMés informacióMés informacióMés informació
Document typeArticle
Defense date2021-01-01
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
This work is protected by the corresponding intellectual and industrial property rights. Except where otherwise noted, its contents are licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
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.
CitationXing, C. [et al.]. A direct Z-scheme for the photocatalytic hydrogen production from a water ethanol mixture on CoTiO3/TiO2 heterostructures. "ACS applied materials and interfaces", 1 Gener 2021, vol. 13, núm. 1, p. 449-457. 
URIhttp://hdl.handle.net/2117/344795
DOI10.1021/acsami.0c17004
ISSN1944-8244
Publisher versionhttps://pubs.acs.org/doi/abs/10.1021/acsami.0c17004
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  • NEMEN - Nanoenginyeria de materials aplicats a l'energia - Articles de revista [244]
  • INTE - Institut de Tècniques Energètiques - Articles de revista [287]
  • Doctorat en Enginyeria de Processos Químics - Articles de revista [141]
  • Departament d'Enginyeria Química - Articles de revista [2.442]
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