화학공학소재연구정보센터
Catalysis Letters, Vol.149, No.1, 25-33, 2019
Nickel Bipyridine (Ni(bpy)(3)Cl-2) Complex Used as Molecular Catalyst for Photocatalytic CO2 Reduction
A facile heterogeneous photocatalyst system that consists of a nickel complex and cadmium sulfide (CdS), which act as the catalyst and light antenna, respectively, was developed to the efficiency photocatalytic activation and conversion of CO2. Ni(bpy)(3)Cl-2 was firstly found to be an active material for photocatalytic CO2 reduction. Besides, promoting the photo-generated electrons transfer from CdS to CO2 through such nickel complex further enhanced the catalytic activity. 5.2 mu mol of CO has been obtained in acetonitrile solution containing Ni(bpy)(3)Cl-2 under 2h visible-light irradiation, which is approximately sixfold more than that system without Ni(bpy)(3)Cl-2 complex. The different amount of Ni(bpy)(3)Cl-2 used reveals the relationship of active center and photocatalytic performance. The use of a suitable amount of Ni(bpy)(3)Cl-2 resulting in an apparent quantum yield of 1.68% at 420nm. Electrochemical measurement and photochemical observation suggest a possible mechanistic detail of charge carrier transfer and information of key intermediates during CO2 reduction, which broadens the perspective of reaction mechanism [GRAPHICS]