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Activity and Selectivity Regulation through the Dimension of Cobalt Active Sites in Photocatalytic CO2 Reduction

Abstract

The development of efficient and economical catalysts for photocatalytic reduction of CO2 into chemical feedstocks is highly desirable for addressing both the global energy crisis and carbon emission problem. Herein, a series of carbonized cobalt composites derived from the bimetallic Zn/Co zeolite imidazolate frameworks (C-BMZIFs) are synthesized and used as the co-catalysts for [Ru(bpy)3]2+ mediated photocatalytic CO2 reduction under visible light irradiation. Varying the Zn/Co ratio allows regulating the dimension of Co active sites, which further differentiates their catalytic activity towards CO2 reduction and H2 evolution, resulting in tunable CO/H2 ratio in the produced syngas. Among all investigated configurations, the C-BMZIF with a Zn/Co ratio of 3:1 demonstrates the highest CO yield of 1.1×104 µmol/g/h, owing to the optimal balance between the quantity of active sites and the single-site activity. Consequently, this work provides insight into the design of stable MOFs-derived co-catalysts for efficient photo-reduction of CO2, and offers an alternative solution for photocatalytic syngas production with tunable CO/H2 ratio.

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Publication details

The article was received on 26 Jun 2018, accepted on 12 Sep 2018 and first published on 13 Sep 2018


Article type: Paper
DOI: 10.1039/C8TA06151C
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Activity and Selectivity Regulation through the Dimension of Cobalt Active Sites in Photocatalytic CO2 Reduction

    Q. Mu, W. Zhu, G. Yan, Y. Lian, Y. Yao, Q. Li, Y. Tian, P. Zhang, Z. Deng and Y. Peng, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA06151C

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