# Kinetic Study of Redox Probes on Glassy Carbon Electrode Functionalized by 4-nitrobenzene Diazonium

William Richard, David Evrard, Pierre Gros

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William Richard, David Evrard, Pierre Gros. Kinetic Study of Redox Probes on Glassy Carbon Electrode Functionalized by 4-nitrobenzene Diazonium. International Journal of Electrochemical Science, 2019, pp.453-469. 10.20964/2019.01.22. hal-03853309

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Submitted on 6 Apr 2023

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# Kinetic Study of Redox Probes on Glassy Carbon Electrode Functionalized by 4-nitrobenzene Diazonium

William Richard, David Evrard*, Pierre Gros

Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France
*E-mail: evrard@chimie.ups-tlse.fr

doi: 10.20964/2019.01.22

Received: 23 July 2018 / Accepted: 22 August 2018 / Published: 30 November 2018

The electrochemical behavior of organic films grafted onto glassy carbon (GC) and bearing $NO_2$, NHOH or $NH_2$ groups was studied by using three different redox probes, namely ferricyanide $Fe(CN)_6^{3-}$, hexaammineruthenium(III) $Ru(NH_3)_6^{3+}$ and ferrocenemethanol $FcMeOH$. Films were prepared by grafting 4-nitrobenzene diazonium onto the GC surface by constant potential electrolysis for durations varying from 1 to 300 s. $NO_2$ groups were converted into NHOH and $NH_2$ by performing further electrolyses at the corresponding potentials. The redox probes were chosen because of their different global charge and electron transfer process. For all the as-obtained films, the Koutecky-Levich treatment was applied and the cathodic (β) and anodic (α) transfer coefficients were extracted. All these data were discussed and compared in order to better understand the structure and the electrochemical properties of the organic films.

**Keywords:** 4-nitrobenzene diazonium; electrode functionalization; stratified film; Koutecky-Levich analysis; electrochemical kinetics; redox probes

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© 2019 The Authors. Published by ESG (www.electrochemsci.org). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).