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Facilitating photocatalytic CO2 methanation via synergetic feed of photon-induced carriers and reactants over S-scheme BiVO4@TiO2 nanograss/needle arrays.

Authors :
Zhao, Dawei
Xuan, Yimin
Sun, Chen
Zhang, Longzhen
Zhu, Qibin
Liu, Xianglei
Source :
Journal of Catalysis. Nov2024, Vol. 439, pN.PAG-N.PAG. 1p.
Publication Year :
2024

Abstract

[Display omitted] • BiVO 4 @TiO 2 shows high selectivity and activity for CO 2 -to-CH 4 conversion. • S-scheme heterojunction was identified by DFT and KPFM. • Effective separation and directional migration of electrons are achieved. • Achieving efficient CO 2 conversion by reinforcing reaction process factors. • A solar-to-fuels efficiency of ∼ 0.46 ‰ is obtained under UV-enhanced light sources. Herein, a unique structure BiVO 4 @TiO 2 nanograss/needle arrays S-scheme heterojunction photocatalyst for CO 2 photoreduction reaction was created. The photocatalyst can drive electrons to the reactive spots spontaneously and continuously, which effectively tackles the problem of severe recombination and disordered migration of photogenerated carriers. Theoretical calculations and experimental results demonstrate that adding BMIM-BF 4 ionic liquid to generate BMIM-*CO 2 intermediate promotes CO 2 activation and enrichment of reactants concentration around the catalytic sites. Benefiting from the sufficient electron supply of catalytic sites and reinforced reactants supply in the interfacial microenvironment, the BiVO 4 @TiO 2 photocatalyst shows high selectivity and activity of CO 2 -to-CH 4 conversion. The CH 4 selectivity increased to 57.3 % (132.7 μmol m-2h−1) and the methanation activity was increased by 8.6 times in the 5.0 % BMIM-BF 4 aqueous solution. Significantly, the BiVO 4 @TiO 2 NNAs catalyst obtains a solar-to-fuels energy efficiency of ∼ 0.46 ‰ under ultraviolet-enhanced light sources without any sacrificial agent or co-catalyst. This work displays the relationship between reaction process factors (electron supply, CO 2 molecule, and proton supply) and CO 2 photoreduction activity and selectivity, giving new insight into achieving efficient CO 2 photoreduction conversion. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00219517
Volume :
439
Database :
Academic Search Index
Journal :
Journal of Catalysis
Publication Type :
Academic Journal
Accession number :
180364938
Full Text :
https://doi.org/10.1016/j.jcat.2024.115760