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In 2 O 3 /In 2 S 3 Heterostructures Derived from In‐MOFs with Enhanced Visible Light Photocatalytic Performance for CO 2 Reduction
Author(s) -
Yan Dahai,
Wan Ziyao,
Wang Kang,
Wang Xitao
Publication year - 2021
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202004839
Subject(s) - heterojunction , reagent , photocatalysis , amorphous solid , sulfur , visible spectrum , materials science , adsorption , chemistry , crystallography , catalysis , organic chemistry , optoelectronics , metallurgy
A series of In 2 O 3 /In 2 S 3 core‐shell heterostructures, derived from metal‐organic‐frameworks (MOFs), were successfully synthesized via a two‐step solvothermal route with different addition amount of sulfur‐bearing reagent (L‐cysteine, L‐Cys), which were used as photocatalysts for CO 2 reduction with water vapor. The results indicated that 1.2‐In 2 O 3 /In 2 S 3 with optimized L‐Cys addition amount had the highest production rate of CH 4 (14.3 μmol g cat −1 h −1 ) and CO (2.59 μmol g cat −1 h −1 ). Pure In 2 O 3 and 2.4‐In 2 O 3 /In 2 S 3 with excess L‐Cys addition exhibited higher H 2 production rate but lowest CO 2 photoreduction activity. As the characterizations revealed, amorphous shell with abundant In 2 O 3 /In 2 S 3 heterostructures greatly improved the separation efficiency of photo‐induced charge carriers and visible light harvesting ability, which promoted the photoreduction of CO 2 consequently. However, over‐addition of sulfur‐bearing reagent destroyed the heterostructures of shell layer and turned them into thickened In 2 S 3 crystal layer. This substitution not only reduced the amount of heterostructures, but also hindered the adsorption of CO 2 on the reactive surface.