Electroreduction of Carbon Dioxide to Carbon Monoxide by Co-pthalocyanine Electrocatalyst under Ambient Conditions

摘要

Electrochemical reduction of carbon dioxide using a gas-electrolysis cell reactor was studied. A new electrocatalyst has been screened and Co-phthalocyanine (Co–Pc) supported on carbon support was found to reduce CO_(2) to CO. Effects of reaction conditions on a formation rate of CO and a selectivity to CO corresponding to a current efficiency (CE) were studied. Loadings of Co–Pc, kinds of carbon materials as a support, reaction temperatures and cathode potentials strongly affected the performance of the electroreduction of CO_(2) to CO. A maximum CE to CO formation was achieved to 70% with 14 mA cm~(–2) by use of 0.1 wt% Co–Pc supported vapor-grown-carbon-fiber (VGCF) electrocatalyst at –0.90 V (Ag/AgCl) and 273 K. The reaction model of electroreduction of CO_(2) was proposed in this work.