Publication 857

Université Paris Diderot, Sorbonne Paris Cité, Laboratoire d’Electrochimie Moléculaire, UMR 7591 CNRS, 15 rue Jean-Antoine de Baïf, F-75205 Paris, Cedex 13, France
Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-1 Okayama, Meguro-ku, Tokyo 152-8550, Japan
Japan Society for the Promotion of Science, Kojimachi Business Center Building, 5-3-1 Kojimachi, Chiyoda-ku, Tokyo 102-0083, Japan
School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, Guangdong 523808, P. R. China
Department of Chemistry and Institute of Molecular Functional Materials, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, P. R. China

Efficient and selective photostimulated CO₂-to-CO reduction by a photocatalytic system consisting of an iron-complex catalyst and a mesoporous graphitic carbon nitride (mpg-C₃N₄) redox photosensitizer is reported for the first time. Irradiation in the visible region (lambda >=400 nm) of an CH₃CN/triethanolamine (4:1, v/v) solution containing [Fe(qpy)(H₂O)₂]²⁺ (qpy = 2,2´:6´,2":6", 2"--quaterpyridine) and mpg-C₃N₄ 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 CO₂ as a renewable feedstock.