Electrochemical CO2 reduction on a glassy carbon electrode under high pressure

Abstract Electrochemical reduction of CO 2 under high pressure on a glassy carbon (GC) electrode was investigated. The selectivity of the reduction products depended strongly on the current density. CO 2 was reduced to CO with a faradaic efficiency of 44% and to formic acid (30%) at a constant current density of 50 mA cm −2 under 30 atm of CO 2 in 0.1 mol dm −3 KHCO 3 aqueous electrolyte. The faradaic efficiency for CO 2 reduction decreased drastically with increasing current density. In addition, formation of hydrocarbons such as methane, ethane, propane, and butane was observed. C3 and C4 hydrocarbons such as propane and n -butane were preferentially produced in the electrolysis at small current densities.

[1]  P. Christensen,et al.  CO2 reduction at platinum, gold and glassy carbon electrodes in acetonitrile: An in-situ FTIR study , 1990 .

[2]  K. W. Frese,et al.  The electrochemical reduction of aqueous carbon dioxide to methanol at molybdenum electrodes with low overpotentials , 1986 .

[3]  Kaname Ito,et al.  Electrochemical Reduction of Carbon Dioxide at Various Metal Electrodes in Aqueous Potassium Hydrogen Carbonate Solution , 1990 .

[4]  Kaname Ito,et al.  Selective Formation of Formic Acid, Oxalic Acid, and Carbon Monoxide by Electrochemical Reduction of Carbon Dioxide , 1987 .

[5]  G. Kyriacou,et al.  Electroreduction of CO2 on differently prepared copper electrodes , 1992 .

[6]  Toshio Tsukamoto,et al.  Electrocatalytic process of CO selectivity in electrochemical reduction of CO2 at metal electrodes in aqueous media , 1994 .

[7]  K. Hashimoto,et al.  Electrochemical reduction of carbon dioxide to higher hydrocarbons in a KHCO3 aqueous solution , 1990 .

[8]  Masahiro Hiramoto,et al.  Electrochemical Reduction of Carbon Dioxide on Various Metal Electrodes in Low‐Temperature Aqueous KHCO 3 Media , 1990 .

[9]  K. Hara,et al.  Electrochemical reduction of high pressure carbon dioxide on Fe electrodes at large current density , 1995 .

[10]  A. Bandi,et al.  Electrochemical Reduction of Carbon Dioxide on Conductive Metallic Oxides , 1990 .

[11]  B. P. Sullivan,et al.  Electrochemical and electrocatalytic reactions of carbon dioxide , 1993 .

[12]  Akihiko Kudo,et al.  Electrochemical reduction of carbon dioxide under high pressure on various electrodes in an aqueous electrolyte , 1995 .

[13]  K. W. Frese,et al.  Electrochemical Reduction of Carbon Dioxide to Methane, Methanol, and CO on Ru Electrodes , 1985 .

[14]  K. Hara,et al.  Electrochemical Reduction of CO 2 on a Cu Electrode under High Pressure Factors that Determine the Product Selectivity , 1994 .

[15]  S. Nakagawa,et al.  Electrochemical reduction of high pressure CO[sub 2] on Ni electrodes , 1993 .

[16]  Akira Murata,et al.  Electrochemical evidence of intermediate formation of adsorbed CO in cathodic reduction of CO2 at a nickel electrode , 1990 .

[17]  Brian E. Conway,et al.  Modern Aspects of Electrochemistry , 1974 .