Electrocatalysis of CO2 Reduction in Brush Polymer Ion Gels.

Abstract

The electrochemical characterization of brush polymer ion gels containing embedded small-molecule redox-active species is reported. Gels comprising PS-PEO-PS triblock brush polymer, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BMIm-TFSI), and some combination of ferrocene (Fc), cobaltocenium (CoCp2(+)), and Re(bpy)(CO)3Cl (1) exhibit diffusion-controlled redox processes with diffusion coefficients approximately one-fifth of those observed in neat BMIm-TFSI. Notably, 1 dissolves homogeneously in the interpenetrating matrix domain of the ion gel and displays electrocatalytic CO2 reduction to CO in the gel. The catalytic wave exhibits a positive shift versus Fc(+/0) compared with analogous nonaqueous solvents with a reduction potential 450 mV positive of onset and 90% Faradaic efficiency for CO production. These materials provide a promising and alternative approach to immobilized electrocatalysis, creating numerous opportunities for application in solid-state devices.

DOI: 10.1021/jacs.6b08795

Cite this paper

@article{McNicholas2016ElectrocatalysisOC, title={Electrocatalysis of CO2 Reduction in Brush Polymer Ion Gels.}, author={Brendon J McNicholas and James D Blakemore and Alice B Chang and Christopher M Bates and Wesley W Kramer and Robert H Grubbs and Harry B. Gray}, journal={Journal of the American Chemical Society}, year={2016}, volume={138 35}, pages={11160-3} }