Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 19, Pages 22314-22322Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c01718
Keywords
halide perovskite; artificial photosynthesis; CO2 reduction; heterojunction; Z-scheme
Funding
- National Key R&D Program of China [2017YFA0700104]
- NSFC [21931007, 21702146]
- Natural Science Foundation of Tianjin City [17JCJQJC43800]
- 111 Project of China [D17003]
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In this study, a new strategy was introduced to construct a direct Z-scheme heterojunction of LF-FAPbBr(3)/alpha-Fe2O3, achieving efficient photocatalytic CO2 reduction. The resulting LF-FAPbBr(3)/alpha-Fe2O3 heterojunction exhibited outstanding photocatalytic performance, with an electron consumption rate significantly higher compared to other reported photocatalysts.
Up to now, the majority of the developed photocatalytic CO2 reduction systems need to use expensive sacrificial reductants as electron source. It is still a huge challenge to drive the photocatalytic CO2 reduction using water as an electron source. Herein, we report a facile strategy for the construction of direct Z-scheme heterojunction of LF-FAPbBr(3)/alpha-Fe2O3, which is manufactured by the in situ and two-step controlled growth of ligand-free formamidinium lead bromide (LF-FAPbBr(3)) nanocrystals on the surface of alpha-Fe2O3 nanorods. The matchable energy levels and direct contact between LF-FAPbBr(3) and alpha-Fe2O3 significantly accelerate the interfacial charge transfer, with a charge separation efficiency (eta(separation)) of 93%, much higher than that of 11% shown by the ligand-capped FAPbBr(3)/alpha-Fe2O3 heterojunction. The resulting efficient separation and raised redox ability of photogenerated carriers endow the LF-FAPbBr(3)/alpha-Fe2O3 heterojunction with an outstanding photocatalytic performance for CO2 reduction (to CO and CH4) coupled with water oxidation (to O-2), achieving a highest electron consumption rate of 175.0 mu mol g(-1) h(-1) among the reported metal halide perovskitebased photocatalysts, which are 5 and 11 times higher in comparison with those of sole LF-FAPbBr(3) and ligand-capped FAPbBr(3)/alpha-Fe2O3, respectively.
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