Cooperative Syngas Production and C-N Bond Formation in One Photoredox Cycle.
Solar-driven syngas production by CO2 reduction provides a sustainable strategy to produce renewable feedstocks. However, this promising reaction often suffers from tough CO2 activation, sluggish oxidative half-reaction kinetics and undesired by-products. Herein, we report a function-oriented strategy of deliberately constructing black phosphorus quantum dots-ZnIn2 S4 (BP/ZIS) heterostructures for solar-driven CO2 reduction to syngas, paired with selectively oxidative C-N bond formation, in one redox cycle. The optimal BP/ZIS heterostructure features the enhanced charge-carrier separation and enriched active sites for cooperatively photocatalytic syngas production with a tunable ratio of CO/H2 and efficient oxidation of amines to imines with high conversion and selectivity. This prominent catalytic performance arises from the efficient electronic coupling between black phosphorus quantum dots and ZnIn2 S4 , as well as the optimized adsorption strength for key reaction intermediates, as supported by both experimental and theoretical investigations. We also demonstrate a synergistic interplay between CO2 reduction and amine dehydrogenation oxidation, rather than simply collecting these two single half-reactions in this dual-functional photoredox system.
['Han|Chuang|C|', 'Li|Yue-Hua|YH|', 'Li|Jing-Yu|JY|', 'Qi|Ming-Yu|MY|', 'Tang|Zi-Rong|ZR|', 'Xu|Yi-Jun|YJ|http://orcid.org/0000-0002-2195-1695']
syngas CO2 reduction black phosphorus heterostructure benzylamine oxidation