Electrochemical reduction of CO{sub 2} with a functional gas-diffusion electrode in aqueous solutions with and without propylene carbonate
A functional gas-diffusion electrode consisting of a modified platinum mesh electrode and a glass filter has been developed in order to convert CO{sub 2} to a useful substance at an overpotential as low as possible. The modification was made by laminating Prussian blue (inner) and polyaniline (outer) on a Pt mesh substrate, and a metal complex was further immobilized onto polyaniline. The improvement of the usefulness of the product and the required overpotential was brought about by using such functional gas-diffusion electrode in a KCl aqueous solution containing 10% propylene carbonate. This is attributed to the maintenance of a high concentration of CO{sub 2} at the electrode surface owing to the direct supply of CO{sub 2} through the gas phase, the high solubility of CO{sub 2} to the solution, and the stabilization of reaction intermediates. The maximum total current efficiency for the reduction of CO{sub 2} was 74.9% at -0.6 V vs. Ag/AgCl, and the main products were ethanol and lactic acid.
- Research Organization:
- Yamaguchi Univ., Ube (JP)
- OSTI ID:
- 20001087
- Journal Information:
- Journal of the Electrochemical Society, Vol. 146, Issue 10; Other Information: PBD: Oct 1999; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
Similar Records
In situ Fourier transform infrared spectroscopic studies on a metal complex-immobilized polyaniline/Prussian blue-modified electrode and the application to the electroreduction of CO{sub 2}
Mechanistic studies of CO{sub 2} reduction on a mediated electrode with conducting polymer and inorganic conductor films