Photocatalysis is promising for the reduction of CO 2 into fuels and chemicals under mild conditions but is still a challenge due to the inert nature of CO 2 . Herein, a ZnIn 2 S 4 /In(OH) 3−x (ZIOS) heterojunction was developed for visible-lightdriven CO 2 reduction, where ZnIn 2 S 4 (ZIS) harvests the light and In(OH) 3−x with frustrated Lewis pairs (FLPs) activates the CO 2 . The hydroxyl-deficient vacancies (OH Vs ) of In(OH) 3−x act as a Lewis acid, and the adjacent hydroxyl groups serve as a Lewis base to form FLPs. The ZIOS composites are fabricated via partial sulfurization of Zn−In−O oxide, constructing a type II heterojunction that facilitates the photogenerated electron transfer from ZnIn 2 S 4 to reduce FLP-activated CO 2 on In(OH) 3−x . The as-prepared ZIOS composites exhibit a CO formation rate of 1945.5 μmol•g −1 •h −1 , which is about 2.76-fold higher than that over ZnIn 2 S 4 , and suppress hydrogen evolution with the CO/H 2 ratio increasing from 0.436 for ZnIn 2 S 4 to 1.6 for ZIOS. This work provides insight into the design of efficient CO 2 reduction photocatalysts.
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