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A Planar-Structured Dinuclear Cobalt(II) Complex with Indirect Synergy for Photocatalytic CO2-to-CO Conversion
Yun-Nan Gong1, Si-Qi Zhao1, Hong-Juan Wang1
1MOE International Joint Laboratory of Materials Microstructure, Institute for New Energy Materials and Low Carbon Technologies, School of Materials Science and Engineering, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin, 300384, China.
A new planar dinuclear cobalt complex enhances photocatalytic CO2 reduction to CO. This dinuclear metal synergistic catalysis (DMSC) shows significantly improved efficiency compared to mononuclear catalysts.
Area of Science:
- Catalysis
- Materials Science
- Photochemistry
Background:
- Dinuclear metal synergistic catalysis (DMSC) effectively enhances photocatalytic CO2 reduction.
- Designing dinuclear metal complexes for DMSC remains challenging due to poorly understood microenvironment effects.
Purpose of the Study:
- To design and investigate a dinuclear cobalt complex for enhanced photocatalytic CO2 reduction.
- To elucidate the mechanism behind the improved catalytic efficiency in dinuclear complexes.
Main Methods:
- Synthesis of a planar dinuclear cobalt complex.
- Photocatalytic CO2 reduction experiments.
- Control experiments and theoretical calculations.
Main Results:
- The dinuclear cobalt complex demonstrated outstanding catalytic efficiency for CO2-to-CO conversion.
- Achieved turnover number (TON) of 14457 and turnover frequency (TOF) of 0.40 s^-1.
- Efficiency was 8.6 times higher than the mononuclear analogue.
Conclusions:
- The planar structure facilitates indirect DMSC via a Co2(I,I) intermediate and fast mass transfer.
- The study provides insights into designing effective dinuclear catalysts for CO2 reduction.
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