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The anodic passivation of carbon electrodes

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Abstract

Based on literature data, the mechanism of anodic passivation of carbon electrodes is discussed. It is proposed that the first step of the anodic passivation process involves the electro-oxidation of carbon to CO(g), while the second step involves the parallel reactions of electro-oxidation of CO(g) to CO2(g), and oligomerization of CO(g) to C6O6(aq) [triquinoyl]. The standard redox potential for C6O6(aq)/6C is calculated to be +0.77 V, which is consistent with the observed passivation of carbon in the potential range of +1.0 to +1.7 V (vs. NHE).

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Acknowledgments

The author would like to express his gratitude to Dr. L. Shekhter for helpful discussions.

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  1. 76D Thurston Rd., Newton, MA, 02464, USA

    Ya I. Tur’yan

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  1. Ya I. Tur’yan
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Correspondence to Ya I. Tur’yan.

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Tur’yan, Y.I. The anodic passivation of carbon electrodes. J Solid State Electrochem 19, 321–323 (2015). https://doi.org/10.1007/s10008-014-2584-y

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  • DOI: https://doi.org/10.1007/s10008-014-2584-y

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