Enhancement of CO2 reduction activity under visible light irradiation over Zn-based metal sulfides by combination with Ru-complex catalysts

[Display omitted] •Zn-based sulfides/Ru-complex hybrid photocatalysts for CO2 photoreduction were synthesized.•Basic characteristics of the complexes and the sulfides determine CO2 photoreduction activities.•(AgIn)0.22Zn1.56S2 or Ni doped ZnS combined with Ru-complexes showed high HCOOH generation....

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2018-05, Vol.224, p.572-578
Main Authors: Suzuki, Tomiko M., Takayama, Tomoaki, Sato, Shunsuke, Iwase, Akihide, Kudo, Akihiko, Morikawa, Takeshi
Format: Article
Language:English
Subjects:
Acetonitrile
Carbon dioxide
Catalysis
Catalysts
Chemical reduction
Chemical synthesis
CO2 reduction
Complex systems
Coordination compounds
Electronics industry
Formic acid
Irradiation
Light
Light irradiation
Metal sulfide
Metal sulfides
Metal-complex
Metals
Nickel
Photocatalysis
Photocatalyst
Photochemistry
Photoreduction
Powder
Radiation
Semiconductors
Sulfide
Sulfides
Suspension systems
Visible-light
Zinc
Zinc sulfide
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Summary:[Display omitted] •Zn-based sulfides/Ru-complex hybrid photocatalysts for CO2 photoreduction were synthesized.•Basic characteristics of the complexes and the sulfides determine CO2 photoreduction activities.•(AgIn)0.22Zn1.56S2 or Ni doped ZnS combined with Ru-complexes showed high HCOOH generation. Hybrid photocatalysts composed of metal sulfide semiconductors combined with various Ru-complex catalysts were synthesized for use during visible light-driven CO2 reduction with powder suspension systems. A variety of Zn-based sulfides, including Ni-doped ZnS, (CuGa)0.8Zn0.4S2 and (AgIn)0.22Zn1.56S2, were adopted by conducting the CO2 reduction reaction in acetonitrile containing an electron donor. The photocatalytic activities were found to be largely dependent on the basic characteristics of the Ru-complex and the metal sulfide. The results demonstrate that several of these sulfide semiconductors improve the CO2 reduction selectivity when employed in the semiconductor/metal-complex system, and that (AgIn)0.22Zn1.56S2 or Ni (0.2mol%)-doped ZnS combined with a neutral Ru-complex incorporating a phosphonate ligand [Ru(4,4′-diphosphonate-2,2′-bipyridine)(CO)2Cl2] exhibit the highest CO2 photoconversion activity when synthesizing formic acid, with a turnover number above 100, which catalysts were stable for 16h irradiation. These results suggest that metal sulfides are potential candidates for use in powdered semiconductor/metal-complex systems for selective CO2 photoreduction.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2017.10.053