Étude chronoampérométrique à température variable

Hladik, Jean; Morand, Geneviève

doi:10.1051/jcp/1966630303

Cited by 2 publications

(1 citation statement)

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“…Determination of the product ␣n ␣ .-An interesting method for determining the product ␣n ␣ is the simultaneous use of the voltam-metric peak current, Ip A , through the equation describing an irreversible electrochemical system 14 [3] where ␣ is the charge-transfer coefficient and n ␣ is the number of charges transferred in the rate-controlling elementary step, and the maximum value m* of its semi-integral 9,15 m* ϭ nFSCD i 1/2 [4] This equation is valid whether or not the electrochemical system is reversible. 15 Combining Eq.…”

Section: Methodsmentioning

confidence: 99%

Anodic Behavior of Carbon Electrodes in CaO ‐ CaCl2 Melts at 1123 K

Mohamedi

Børresen

Haarberg

et al. 1999

J. Electrochem. Soc.

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The anodic process on glassy carbon electrodes in molten CaCl 2 containing CaO was investigated at 1123 K by cyclic voltammetry and convolution voltammetry. It was found that the oxidation sequence occurs through a consecutive two-step electrochemical reaction: O 2Ϫ (diss) ϩ xC r C x O(ads) ϩ 2e and O 2Ϫ (diss) ϩ C x O(ads) r CO 2 (gas) ϩ (x Ϫ 1)C ϩ 2e. Both steps were found to be irreversible. Experimental data indicate that the first electrochemical step is preceded by the dissociation of a complex. The diffusion coefficient of the oxygen-containing species, the charge-transfer coefficient, and the charge-transfer rate constant were found equal to 2.0 ϫ 10 Ϫ6 cm 2 s Ϫ1 , 0.43, and 1.8 ϫ 10 Ϫ5 cm s Ϫ1 , respectively.

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