Electrochemical reduction of high pressure CO[sub 2] on Ni electrodes
- Tokyo Inst. of Tech., Yokohama (Japan). Dept. of Electronic Chemistry
The electrochemical reduction of CO[sub 2] under high pressures of CO[sub 2] was investigated on Ni electrodes. With an increase in CO[sub 2] pressure, the Faradaic efficiency for CO[sub 2] reduction was increased while that of H[sub 2] evolution by water reduction was decreased. Current density at [minus]1.8 V vs. Ag/AgCl did not depend greatly on CO[sub 2] pressure at 30C. By increasing temperature, the Faradaic efficiency for hydrocarbon formation was increased, suggesting that thermal activation was needed, although the total reduction efficiency for CO[sub 2] reduction was decreased. The Faradaic efficiency for the hydrocarbon formation showed a maximum at [minus]1.6 V (Ag/AgCl), while those for CO and HCOOH were increased with increasing cathodic polarization. The weight distribution of hydrocarbons formed on Fe, Co, and Ni electrodes agreed well with the Schultz-Flory distribution, indicating that hydrocarbons were formed via a mechanism similar to a Fischer-Tropsch reaction for thermal catalysis, i.e., polymerization of surface carbene groups ([minus]CH[sub 2][minus]) produced by the reduction of CO which was formed by CO[sub 2] reduction.
- OSTI ID:
- 6250037
- Journal Information:
- Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 140:6; ISSN JESOAN; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400* -- Electrochemistry
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CARBOXYLIC ACIDS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT
CURRENT DENSITY
ELECTROCHEMICAL CELLS
ELEMENTS
FISCHER-TROPSCH SYNTHESIS
FORMIC ACID
HYDROCARBONS
HYDROGEN
IRON
METALS
MONOCARBOXYLIC ACIDS
NICKEL
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PRESSURE DEPENDENCE
REDUCTION
SYNTHESIS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS