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In Situ Fabrication of 3D Octahedral g‐C 3 N 4 /BiFeWO x Double‐Heterojunction for Highly Selective CO 2 Photoreduction to CO Under Visible Light
Author(s) -
Wang Yanan,
Zeng Yiqing,
Wan Shipeng,
Cai Wei,
Song Fujiao,
Zhang Shule,
Zhong Qin
Publication year - 2018
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201800959
Subject(s) - heterojunction , hydrothermal circulation , materials science , octahedron , crystallography , optoelectronics , chemistry , crystal structure , chemical engineering , engineering
A series of g‐C 3 N 4 /BiFeWO x composites (GN‐x/BFW) with double‐heterojunction composites as photocatalysts for efficient and stable CO 2 photoreduction had been rationally designed and synthesized by the facile in situ hydrothermal method. In situ growing BFW on g‐C 3 N 4 sheets achieved that the g‐C 3 N 4 was embedded in the inner of BFW as well as wrapped on the surfaces of BFW. The obtained heterojunction composites greatly inhibited the recommendation of photogenerated electron/hole pairs and enhanced the light respond on the visible light due to the tight chemically bonded interface interaction. Benefiting from the unique structure, the optimized GN‐5.0 %/BFW heterostructure catalyst showed a higher performance of photoreduction CO 2 to CO (43 μmol h −1 g −1 ) than that of pure BFW (5.2 μmol h −1 g −1 ) and g‐C 3 N 4 (8.9 μmol h −1 g −1 ) under visible light irradiation at 10 °C. Besides, the GN‐x/BFW composites exhibited outstanding recycling photostability and structural stability. A possible Z‐scheme mechanism was proposed according to the staggered band potentials between g‐C 3 N 4 and BFW and ESR results. Similarly, this facile synthetic method could be employed to fabricate other composites to accelerate the photocatalytic performance.