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On the mechanism of photocatalytic reactions on CuxO@TiO2 core-shell photocatalysts

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Title: On the mechanism of photocatalytic reactions on CuxO@TiO2 core-shell photocatalysts
Authors: Wang, Kunlei Browse this author
Bielan, Zuzanna Browse this author
Endo-Kimura, Maya Browse this author
Janczarek, Marcin Browse this author
Zhang, Dong Browse this author
Kowalski, Damian Browse this author
Zielinska-Jurek, Anna Browse this author
Markowska-Szczupak, Agata Browse this author
Ohtani, Bunsho Browse this author →KAKEN DB
Kowalska, Ewa Browse this author →ORCID
Issue Date: 28-Apr-2021
Publisher: Royal Society of Chemistry
Journal Title: Journal of Materials Chemistry A
Volume: 9
Issue: 16
Start Page: 10135
End Page: 10145
Publisher DOI: 10.1039/d0ta12472a
Abstract: Titania (titanium(IV) oxide) is a highly active, stable, cheap and abundant photocatalyst, and is thus commonly applied in various environmental applications. However, two main shortcomings of titania, i.e., charge carrier recombination and inactivity under visible-light (vis) irradiation, should be overcome for widespread commercialization. Accordingly, titania has been doped, surface modified and coupled with various ions/compounds, including narrower bandgap semiconductors, such as oxides of copper and silver. Unfortunately, these oxides are not as stable as titania, and thus loss of activity under long-term irradiation (photo-corrosion) has been observed. Therefore, this study has focused on the preparation of stable coupled photocatalysts, i.e., CuxO@TiO2 core-shell nanostructures, by the microemulsion method from commercial Cu2O as a core and TiO2 (ST01-fine anatase) as a shell. The photocatalysts have been characterized by DRS, SEM, TEM, XRD, XPS and reversed double-beam photoacoustic spectroscopy (RDB-PAS) methods, and activity tests under UV (anaerobic dehydrogenation of methanol and oxidative decomposition of acetic acid) and vis (phenol oxidation) irradiation. The higher activities of coupled photocatalysts than their counterparts have been found in all studied systems under UV/vis irradiation. Moreover, long-term experiments (10 h) have shown high stability of CuxO@TiO2. However, the change of oxidation state of copper has also been observed, i.e., to negative and positive values, confirming the charge transfer according to the Z-scheme under UV irradiation and type-II heterojunction under vis irradiation, respectively. The property-governed activity and the mechanism have been discussed in detail.
Type: article (author version)
Appears in Collections:触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Ewa Kowalska

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