2026-04-13T01:14:32Zhttps://recercat.cat/oai/request

oai:recercat.cat:2072/4663972026-03-28T08:24:00Zcom_2072_98col_2072_378192

00925njm 22002777a 4500 dc Xing, Congcong author Liu, Yongpeng author Zhang, Yu author Wang, Xiang author Guardia, Pablo author Yao, Liang author Han, Xu author Zhang, Ting author Arbiol i Cobos, Jordi author Soler, Lluís author Chen, Yufen author Sivula, Kevin author Guijarro, Néstor author Cabot i Codina, Andreu author Llorca, Jordi author 2021 El títol alternatiu correspon al preprint de l'article publicat. 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. 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. Bioethanol Photocatalysis Hydrogen Titanium dioxide Z-scheme Titanate Dehydrogenation A direct Z-Scheme for the photocatalytic hydrogen production from a water ethanol mixture on CoTiO3/TiO2 heterostructures