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A facile acid treatment for P25 modification with enhanced photocatalytic H2 evolution – effect of Brønsted acid sites and oxygen vacancies

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Abstract

Acid treated P25 catalysts (HP25-x, x represents the treatment temperature) were successfully fabricated via a simple soaking and drying process for photocatalytic H2 production. After acid treatment, a substantial number of –OH groups were obtained on the surface of HP25-60, which can act as Brønsted acid sites providing hydrogen protons for H2 generation. Besides, more oxygen vacancies and Ti3+ sites were also created on the HP25-60 surface after acid treatment, which could enhance the carrier separation and transfer efficiency by capturing more electrons and holes, respectively. The H2 production over HP25-60 reached 4853 μmol h−1 with Pt as a co-catalyst, which is 7.1 times higher than 679 μmol h−1 of bare TiO2. Three favorable factors for H2 photogeneration, i.e. Brønsted acid sites, oxygen vacancies and Ti3+ sites, can be introduced on a catalyst surface via a simple one-step acid strategy, which can be applied as a universally-applicable modification method for valence-alternative metal oxide semiconductors for enhanced H2 photogeneration.

Graphical abstract: A facile acid treatment for P25 modification with enhanced photocatalytic H2 evolution – effect of Brønsted acid sites and oxygen vacancies

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Supplementary files

Article information


Submitted
28 Oct 2019
Accepted
14 Dec 2019
First published
16 Dec 2019

Catal. Sci. Technol., 2020, Advance Article
Article type
Paper

A facile acid treatment for P25 modification with enhanced photocatalytic H2 evolution – effect of Brønsted acid sites and oxygen vacancies

C. Lv, X. Lan, F. Li, L. Wang, L. Xiao, C. Wang, J. Shi and S. Yu, Catal. Sci. Technol., 2020, Advance Article , DOI: 10.1039/C9CY02166C

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