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Robust Binding between Carbon Nitride Nanosheets and a Binuclear Ruthenium(II) Complex Enabling Durable, Selective CO 2 Reduction under Visible Light in Aqueous Solution
Author(s) -
Kuriki Ryo,
Yamamoto Muneaki,
Higuchi Kimitaka,
Yamamoto Yuta,
Akatsuka Masato,
Lu Daling,
Yagi Shinya,
Yoshida Tomoko,
Ishitani Osamu,
Maeda Kazuhiko
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201701627
Subject(s) - aqueous solution , photocatalysis , formate , ruthenium , graphitic carbon nitride , carbon nitride , selectivity , desorption , inorganic chemistry , chemistry , carbon fibers , photochemistry , materials science , catalysis , organic chemistry , adsorption , composite number , composite material
Abstract Carbon nitride nanosheets (NS‐C 3 N 4 ) were found to undergo robust binding with a binuclear ruthenium(II) complex ( RuRu′ ) even in basic aqueous solution. A hybrid material consisting of NS‐C 3 N 4 (further modified with nanoparticulate Ag) and RuRu ′ promoted the photocatalytic reduction of CO 2 to formate in aqueous media, in conjunction with high selectivity (approximately 98 %) and a good turnover number (>2000 with respect to the loaded Ru complex). These represent the highest values yet reported for a powder‐based photocatalytic system during CO 2 reduction under visible light in an aqueous environment. We also assessed the desorption of RuRu ′ from the Ag/C 3 N 4 surface, a factor that can contribute to a loss of activity. It was determined that desorption is not induced by salt additives, pH changes, or photoirradiation, which partly explains the high photocatalytic performance of this material.