Issue 19, 2003

Characterisation and application of a novel cell for mechanistic electrochemistry at elevated temperatures

Abstract

A novel high temperature cell capable of measuring electrochemical signals up to temperatures of 115 °C is reported. Characterisation of the cell has been undertaken by examining three differing systems. First the voltammetric response of a range of simple redox systems in both aqueous and non-aqueous media was recorded in order to deduce the activation energies for diffusion of these molecules. Next the steady state linear sweep voltammetric response of N,N,N′,N′-tetramethyl-p-phenylenediamine (TMPD) in dimethyl sulfoxide (DMSO) is assessed as a means of studying an inferred structural change of the solvent at elevated temperatures. A change in the activation energy for diffusion from 13 kJ mol−1 to 27 kJ mol−1 was observed as the temperature was raised. Finally, the electrochemically catalysed reaction of the radical cation TMPD+˙ with ascorbic acid is studied from 25 °C to 107 °C; the corresponding kinetic parameters are deduced.

Article information

Article type
Paper
Submitted
10 Jul 2003
Accepted
13 Aug 2003
First published
04 Sep 2003

Phys. Chem. Chem. Phys., 2003,5, 4219-4225

Characterisation and application of a novel cell for mechanistic electrochemistry at elevated temperatures

G. G. Wildgoose, N. S. Lawrence, B. A. Coles, L. Jiang, T. G. J. Jones and R. G. Compton, Phys. Chem. Chem. Phys., 2003, 5, 4219 DOI: 10.1039/B307900G

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