Efficient and selective photostimulated CO-to-CO reduction by a photocatalytic system consisting of an iron-complex catalyst and a mesoporous graphitic carbon nitride (mpg-CN) redox photosensitizer is reported for the first time. Irradiation in the visible region (λ ≥ 400 nm) of an CHCN/triethanolamine (4:1, v/v) solution containing [Fe(qpy)(HO)] (qpy = 2,2':6',2'':6'',2''-quaterpyridine) and mpg-CN resulted in CO evolution with 97% selectivity, a turnover number of 155, and an apparent quantum yield of ca. 4.2%. This hybrid catalytic system, comprising only earth abundant elements, opens new perspectives for solar fuels production using CO as a renewable feedstock.
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