2003 Volume 71 Issue 8 Pages 676-680
A new electrolysis system has been developed for the efficient reduction of carbon dioxide in which CO2 is selectively reduced to ethylene by the electrolysis at the three-phase (gas/liquid/solid) interface on a CuCl-confined Cu-mesh electrode. In this system, CO2 is supplied to the electrode surface from gas phase, and a high concentration of CO2 can be maintained during the electrolysis irrespective of the solubility of CO2 to solution. Maximum faradaic efficiency (about 70%) for C2H4 was obtained at −1.8V vs Ag/ AgCl, and the selectivity estimated on the basis of carbon content was about 75%. The selective reduction of CO2 to ethylene was found to be caused by the immobilized CuCl which operates as a heterogeneous catalyst by offering adsorption sites for CO and methylene radicals.