Highly effective photoreduction of CO2 to CO promoted by integration of CdS with molecular redox catalysts through metal-organic frameworks

Chunjun Chen; Tianbin Wu; Haihong Wu; Huizhen Liu; Qingli Qian; Zhimin Liu; Guanying Yang; Buxing Han

doi:10.1039/c8sc02809e

Highly effective photoreduction of CO₂ to CO promoted by integration of CdS with molecular redox catalysts through metal-organic frameworks

Chem Sci. 2018 Sep 24;9(47):8890-8894. doi: 10.1039/c8sc02809e. eCollection 2018 Dec 21.

Authors

Chunjun Chen^{1

2}, Tianbin Wu¹, Haihong Wu³, Huizhen Liu^{1

2}, Qingli Qian¹, Zhimin Liu^{1

2}, Guanying Yang¹, Buxing Han^{1

2}

Affiliations

¹ Beijing National Laboratory for Molecular Sciences , CAS Key Laboratory of Colloid and Interface and Thermodynamics , CAS Research/Education Center for Excellence in Molecular Sciences , Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , P. R. China . Email: hanbx@iccas.ac.cn ; Email: wtb@iccas.ac.cn.
² University of Chinese Academy of Sciences , Beijing 100049 , China.
³ Shanghai Key Laboratory of Green Chemistry and Chemical Processes , School of Chemistry and Molecular Engineering , East China Normal University , Shanghai 200062 , China.

Abstract

We propose a strategy to synthesize ternary CdS/UiO-bpy/Co composites by integration of CdS and molecular redox catalysts through metal-organic framework (MOF) UiO-bpy. The CdS/UiO-bpy/Co composites were very effective for photocatalytic conversion of CO₂ to CO under visible light irradiation. The evolution rate of CO could reach 235 μmol g^-1 h^-1, which was a 10.2-fold improvement compared to that for the parent CdS, and selectivity for CO was 85%. The outstanding performance of the CdS/UiO-bpy/Co composites resulted from promoting the separation and migration of photo-induced charge carriers, enhancing the adsorption of CO₂ molecules, and offering abundant active sites for CO₂ reduction. As far as we know, this is the first study to integrate inorganic semiconductors and molecular redox catalysts through MOFs.