Volume 213, Issue 8 pp. 2087-2098
Original Paper

Assessment of heterogeneous electron-transfer rate constants for soluble redox analytes at tetrahedral amorphous carbon, boron-doped diamond, and glassy carbon electrodes

Romana Jarošová

Romana Jarošová

Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA

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Paula M. De Sousa Bezerra

Corresponding Author

Paula M. De Sousa Bezerra

Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA

Corresponding author: e-mail [email protected], Phone: +1 517 353 1090

Present address: Department of Chemistry, Federal University of São Carlos, São Carlos SP-310, Brazil.

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Catherine Munson

Catherine Munson

Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA

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Greg M. Swain

Corresponding Author

Greg M. Swain

Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA

Corresponding author: e-mail [email protected], Phone: +1 517 353 1090

Present address: Department of Chemistry, Federal University of São Carlos, São Carlos SP-310, Brazil.

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First published: 20 July 2016
Citations: 32

Abstract

The electrochemical properties of a nitrogen-incorporated tetrahedral amorphous carbon (ta-C:N) thin-film electrode were investigated. Cyclic voltammetry was used to investigate the background current response as a function of potential, scan rate, and electrolyte composition. Cyclic voltammetry and digital simulation were used to determine the heterogeneous electron-transfer rate constants (ko) for IrCl62−/3−, Fe(CN)63−/4−, ferrocene carboxylic acid, Ru(NH3)63+/2+, and methyl viologen. The results revealed that the background current for the ta-C:N electrode falls between that of BDD and GC. ko values for all the redox analytes at ta-C:N were comparable to the values at BDD and GC. ko values were lower for Fe(CN)63−/4−, 10−3 cm s−1, than for the other four redox systems, 10−2–10−1 cm s−1. ko for Ru(NH3)63+/2+ was insensitive to the electrolyte cation (Li+, Na+, K+, and Cs+) at all three electrodes. In contrast, ko for Fe(CN)63−/4− was sensitive to the cation type with the greatest sensitivity seen for the ta-C:N electrode suggestive of more significant double layer effects. The ta-C:N electrode supports relatively rapid electron transfer for a wide range of redox systems with formal potentials from ca. 0.9 to −1.0 V vs. Ag/AgCl.

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