Journal
NANO ENERGY
Volume 62, Issue -, Pages 426-433Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2019.05.060
Keywords
TiO2; 3-Component photocatalystis; Photocatalytic CO2 production; CO2 conversion; Solar energy; Artificial photosynthesis
Categories
Funding
- Australian Research Council
- National Nanotechnology Center (NANOTEC, Thailand)
- National Natural Science Foundation of China [51578488, 2180050404]
- Program for Zhejiang Leading Team of ST Innovation [2013TD07]
- XJTLU research development fund [RDF-17-01-12]
- Royal Thai Government Scholarship for Science and Technology
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A new class of three-component photocatalyst system is designed with plasmonic AuCu nanoprisms embedded between a porous single crystalline TiO2 nanoplate thin film and polyhedral zeolitic imidazolate frameworks (ZIF-8) nanoparticles for enhanced CO2 photocatalytic reduction. The ZIF-8 plays a role of CO2 capture to enhance the reactant concentration on the catalyst, while the AuCu nanoprisms function mainly as a mediator to improve the charge density at the interfaces and facilitate the charge transfer to the CO2 adsorption sites on ZIF-8 for subsequent CO2 reduction. The reactant CO2 could be not only readily collected on the newly designed catalyst, but also more efficiently converted to CO and CH4. As a result, compared to the reference sample of two-component system of TiO2 and ZIF-8 with a CO2 conversion rate of 12.5 mu mol h(-1) g(-1), the new three-component photocatalyst exhibited a nearly 7-fold improvement in CO2 photocatalytic reduction performance with CO2 conversion reaching an outstanding value of 86.9 mu mol h(-1) g(-1), highlighting the importance of rational heterojunction design in facilitating reactant adsorption, charge transfer and reaction processes in photocatalysis.
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