Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 263, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118314
Keywords
Anatase TiO2 nanocrystal; g-C3N4; Au nanoparticles; Z-scheme system; Photocatalytic CO2 conversion
Funding
- National Natural Science Foundation of China [21673142, 21972166]
- PetroChina Innovation Foundation [2018D-5007-0505]
- Science Foundation of China University of Petroleum, Beijing [242017QNXZ02, 2462018BJC005]
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Z-scheme-type photocatalysts with two photochemical systems of graphic-C3N4 (g-C3N4) and anatase TiO2 (A-TiO2) nanocrystals combined with Au nanoparticles (NPs) [(Au/A-TiO2)@(g-C3N4) were successfully fabricated. The surface heterojunction between coexposed {001} and {101} facets in A-TiO2 nanocrystals improves separation efficiency of photoelectrons and holes. Supported Au NPs gather and transfer the stimulated electrons originated from A-TiO2 to g-C3N4. Wrapped g-C3N4 nanosheets can not only trap the photoelectrons, but also its surface re bond can improve adsorption capabilities for CO2. (Au/A-TiO2)@g-C3N4 catalysts with enriched surface photoelectrons and CO2 exhibit high photocatalytic activity for visible-light-driven conversion of CO2, i.e., the formation rates of CH4 and CO over (Au/A-TiO2)@C3N4-5 catalyst are 37.4 and 21.7 mu mol g(-1) h(-1), respectively. The selectivity for CO2 reduction is higher than 99%, and the selectivity of CH4 product increases from 1.4% to 63.3%. The innovation of Z-scheme-type photocatalysts is expected to provide new inspiration for artificial simulation photosynthesis.
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