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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