期刊
CATALYSIS TODAY
卷 388, 期 -, 页码 79-86出版社
ELSEVIER
DOI: 10.1016/j.cattod.2020.11.012
关键词
Hydrogenation; Hydrogen evolution; Photocatalysis; Bimetallic; X-ray absorption spectra
资金
- Ministry of Science and Technology, Taiwan [MOST 108-2112-M-213-002-MY3, MOST 108-2218-E-009-039-MY3, MOST108-3017-F-009-004]
- Center for Emergent Functional Matter Science of National Chiao Tung University from The Featured Areas Research Center Program by the Ministry of Education (MOE) in Taiwan
The efficacy of treatment with hydrogen and Ag-Cu co-deposition on TiO2 photocatalysts has been investigated computationally and experimentally. The results show that the hydrogenated Ag-Cu with co-loaded TiO2 achieved a photoactivity about 110 times greater than that of pristine TiO2. This enhancement is attributed to the synergy between new electronic states and lattice distortion. Soft X-ray spectra and quantum-chemical calculations provide evidence for this mechanism. The photocatalytic process involves the transfer of photo-excited electrons from the bimetallic Ag-Cu to the TiO2 conduction band, as observed through in situ soft X-ray absorption spectra (XAS). The coupling of hydrogenation with bimetallic Ag-Cu onto TiO2-based photocatalysis offers a promising solution for environmental and energy applications.
The efficacy of treatment with hydrogen and Ag-Cu co-deposition on TiO2 photocatalysts has been investigated computationally and experimentally. The hydrogenated Ag-Cu with co-loaded TiO2 (H:(Ag-Cu/TiO2)) achieved a photoactivity about 110 times that of pristine TiO2, which corresponds to a rate of 1.16 mmol h(-1) g(-1) for hydrogen generation. Soft X-ray spectra and quantum-chemical calculations indicate that the notable promotion of photoactivity on H:(Ag-Cu/TiO2) is ascribable to the synergy between new electronic states and a lattice distortion. The soft X-ray absorption spectra (XAS) indicated that the TiO6 octahedral symmetry and the Ti 3d-orbital orientation are significantly affected by the Ag-Cu decoration and the hydrogenation treatment. The mechanisms involved in this photocatalysis were studied with soft XAS in situ, which showed that the photo-excited electrons transfer from the bimetallic Ag-Cu to the TiO2 conduction band as the photoresponse of this composite photocatalyst. The strategy of coupling hydrogenation with bimetallic Ag-Cu onto TiO2-based photocatalysis provides a facile and promising solution to other environmental and energy applications.
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