Long-lived photoinduced charge-carriers in Er3+ doped CaTiO3 for photocatalytic H2 production under UV irradiation

The incorporation of Er3+ ions in the CaTiO3 structure provides an enhanced H2 photoproduction due to the formation of long-lived charge-carriers in the semiconductor. Nitroblue tetrazolium reaction, photoluminescence and time resolved microwave conductivity techniques were used to investigate the g...

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Bibliographic Details
Published in:Catalysis communications 2016-09, Vol.84, p.36-39
Main Authors: Lozano-Sánchez, L.M., Méndez-Medrano, M.G., Colbeau-Justin, C., Rodríguez-López, J.L., Hernández-Uresti, D.B., Obregón, S.
Format: Article
Language:English
Subjects:
CaTiO3
Charge-carriers
Erbium
Hydrogen
Photocatalysis
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Summary:The incorporation of Er3+ ions in the CaTiO3 structure provides an enhanced H2 photoproduction due to the formation of long-lived charge-carriers in the semiconductor. Nitroblue tetrazolium reaction, photoluminescence and time resolved microwave conductivity techniques were used to investigate the generation of the superoxide species and the lifetime of the charge-carriers. The improved photoactivity has been explained in terms of the dopant agent, finding that phenomena such as a higher concentration of the superoxide radicals, a more efficient separation of the photogenerated charge-carriers, and a slower recombination process take place in the Er3+ doped CaTiO3 compared to the undoped CaTiO3. [Display omitted] •Erbium-doped CaTiO3 was prepared by a microwave-assisted hydrothermal method.•Er3+ doped material shows an excellent performance in the H2 photoproduction.•Long-lived charge carriers were formed due to the incorporation of erbium.•TRMC technique demonstrates a slower recombination process in the Er3+-CaTiO3.
ISSN:1566-7367
1873-3905
DOI:10.1016/j.catcom.2016.06.002