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Title: Selective CO{sub 2} reduction conjugated with H{sub 2}O oxidation utilizing semiconductor/metal-complex hybrid photocatalysts

We developed a new hybrid photocatalyst for CO{sub 2} reduction, which is composed of a semiconductor and a metal complex. In the hybrid photocatalyst, ΔG between the position of conduction band minimum (E{sub CBM}) of the semiconductor and the CO{sub 2} reduction potential of the complex is an essential factor for realizing fast electron transfer from the conduction band of semiconductor to metal complex leading to high photocatalytic activity. On the basis of this concept, the hybrid photocatalyst InP/Ru-complex, which functions in aqueous media, was developed. The photoreduction of CO{sub 2} to formate using water as an electron donor and a proton source was successfully achieved as a Z-scheme system by functionally conjugating the InP/Ru-complex photocatalyst for CO{sub 2} reduction with a TiO{sub 2} photocatalyst for water oxidation. The conversion efficiency from solar energy to chemical energy was ca. 0.04%, which approaches that for photosynthesis in a plant. Because this system can be applied to many other inorganic semiconductors and metal-complex catalysts, the efficiency and reaction selectivity can be enhanced by optimization of the electron transfer process including the energy-band configurations, conjugation conformations, and catalyst structures. This electrical-bias-free reaction is a huge leap forward for future practical applications of artificialmore » photosynthesis under solar irradiation to produce organic species.« less
Authors:
; ; ; ; ; ; ;  [1]
  1. Toyota Central R and D Labs, Inc., Nagakute, Aichi 480-1192 (Japan)
Publication Date:
OSTI Identifier:
22261734
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1568; Journal Issue: 1; Conference: International workshop on solar-chemical energy storage (SolChES), Sendai (Japan), 23-28 Jul 2012; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BINDING ENERGY; CARBON DIOXIDE; CATALYSTS; EFFICIENCY; ELECTRON TRANSFER; IRRADIATION; OXIDATION; PHOTOCATALYSIS; PHOTOSYNTHESIS; RUTHENIUM COMPLEXES; SEMICONDUCTOR MATERIALS; SOLAR ENERGY; TITANIUM OXIDES