Electroreduction of CO 2 to C 2 and C 3 compounds on Bis(4,5-dihydroxybenzene-1,3-disulphonato)ferrate(II)-fixed polyaniline | Prussian Blue-modified electrode in aqueous solutions

Abstract

Electrocatalytic reduction of CO 2 has been performed using the bis(1,2-dihydroxybenzene-3,5-disulphonato)ferrate(II)-immobilized polyaniline | Prussian Blue-modified electrode in aqueous solutions. CO 2 was reduced at a low overpotential under ambient condition, and lactic acid, together with C 2 and C 1 compounds, was obtained with the highest selectivity of about 88%. The most probable pathway of the reduction of CO 2 is the stepwise hydrogenation by H ads. Adsorbed hydrogen atoms were generated by the catalytic reduction of H + ions near the PAn | PB interface where the doping and undoping processes of K + ions proceed simultaneously.