THE KINETICS OF THE 02/C02 REACTION IN MOLTEN CARBONATE: REACTION ORDERS FOR 02 AND CO2 ON NiO

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A molten carbonate electrolytic cell of the Broers and Ketalaar type was used to study the reaction CO{sub 2} + 1/2 O{sub 2} + 2e{sup -} {r_equilibrium} CO{sub 2} {double_bond} in an Li/K carbonate eutectic melt with porous NiO electrodes. A noble gas Au wire reference electrode was used to measure anodic and cathodic polarizationduring electrolysis. Steady-state polarization curves were obtained at 800-1000 K with a matrix of fifteen CO{sub 2}/O{sub 2} mixtures: 0.5, 1, 10, 20, 50% CO{sub 2}/1,19, 50% O{sub 2}. Kinetic analysis in the linear overpotential region indicated ({partial_derivative} log i{sub 0}/{partial_derivative} log P) is near zero ... continued below

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18 p.

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Winnick, Jack & Ross, Philip N., Jr. May 1, 1980.

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A molten carbonate electrolytic cell of the Broers and Ketalaar type was used to study the reaction CO{sub 2} + 1/2 O{sub 2} + 2e{sup -} {r_equilibrium} CO{sub 2} {double_bond} in an Li/K carbonate eutectic melt with porous NiO electrodes. A noble gas Au wire reference electrode was used to measure anodic and cathodic polarizationduring electrolysis. Steady-state polarization curves were obtained at 800-1000 K with a matrix of fifteen CO{sub 2}/O{sub 2} mixtures: 0.5, 1, 10, 20, 50% CO{sub 2}/1,19, 50% O{sub 2}. Kinetic analysis in the linear overpotential region indicated ({partial_derivative} log i{sub 0}/{partial_derivative} log P) is near zero for CO{sub 2} and 0.5 for O{sub 2}. The kinetic Tafel slope wasmeasured from current-potential curves for current densities well below the diffusion limiting current and was found to be ca. RT/2F for cathodic polarizationand ca. 3RT/2F for anodic polarization. The reaction orders are + 1/4 in CO{sub 2} and + 5/8 in O{sub 2} in the cathodic direction, and -3/4 in CO{sub 2} and + 1/8 in O{sub 2} in the anodic direction.

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18 p.

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  • Journal Name: Journal of the Electrochemical Society; Journal Volume: 128; Journal Issue: 5

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  • Report No.: LBL-10937
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 1022093
  • Archival Resource Key: ark:/67531/metadc841567

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  • May 1, 1980

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  • May 19, 2016, 3:16 p.m.

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  • Oct. 2, 2017, 5:06 p.m.

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Winnick, Jack & Ross, Philip N., Jr. THE KINETICS OF THE 02/C02 REACTION IN MOLTEN CARBONATE: REACTION ORDERS FOR 02 AND CO2 ON NiO, article, May 1, 1980; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc841567/: accessed May 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.