Activation and reduction of CO2 on the functional dual-film electrode and in situ FTIR analysis

Activation and reduction of CO2 on the 1,8-dihydroxynaphthalene-3,6-disulphonatoiron(II) complex-fixed polyaniline / Prussian blue-modified electrode has been studied by means of ill situ Fourier transform infrared spectroscopic method. On the cathodic polarization, CO2 was accumulated with the modified electrode from 0 V vs Ag/AgCl, and the CO2 was electroreduced to C-1 similar to C-3 species at more negative potentials than -0.3 V. The capturing of CO2 by the electrode mediator was accomplished through the bonding with PAn of the benzenoid structure in such a way that the nitrogen atom with localized electrons links with the electrophilic carbon atom of CO2.