Electrochemical CO2 reduction reaction (CO2RR) is a promising strategy for the conversion of waste CO2 into value added products. A terthiophene modified cobalt pyridyldiimine complex (CoTTPDI) has been prepared and shows high catalytic activity for electrochemical CO2 reduction in acetonitrile with proton source. Our current efforts are focused on extending this CoTTPDI complex into one or two dimensional (1D/2D) polymeric architectures, with a desire to integrate the advantages of both homogeneous and heterogeneous catalysts. 1D polymeric architecture (1D-polyCoTTPDI) has been prepared by electro-polymerization of CoTTPDI on glassy carbon electrode. The 1D-polyCoTTPDI shows greater catalytic activity for CO2RR than its precursor CoTTPDI. This improvement is endowed by the high coverage density of CoTTPDI on the electrode surface and the good conductivity of polyterthiophene. The catalytic activity can be further enhanced by adding water as a cheap proton source into the catalysis system. In addition, 2D polymeric architecture (2D-polyCoTTPDI) is prepared by electro-copolymerization of CoTTPDI with several crosslinkers. The porous structure of 2D-polyCoTTPDI can provide more active catalytic sites exposed to substrates, contributing to increased catalytic activity. As numerous metal complexes are known for a broad scope of electrocatalytic transformations, these extended polymeric architectures are anticipated to serve as a platform for future studies.

Design and electrochemical study of multidimensional polymeric architectures for electrocatalytic CO2 reduction

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