The reduction of l-cystine hydrochloride at stationary and rotating disc mercury electrodes
Ralph, T.R., Hitchman, M.L., Millington, J.P. and Walsh, F.C. (2005) The reduction of l-cystine hydrochloride at stationary and rotating disc mercury electrodes. Electrochimica Acta, 51, (1), 133-145. (doi:10.1016/j.electacta.2005.04.012).
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The kinetics of l-cystine hydrochloride reduction have been studied at a mercury-plated copper rotating disc electrode (RDE) and at a stationary mercury disc electrode (SMDE) in 0.1 mol dm−3 HCl at 298 K. The reduction of the disulphide is irreversible and hydrogen evolution is the major side reaction. In contrast to steady state electrode kinetic studies at a mercury drop electrode (which shows a well-defined limiting current), the mercury-plated Cu RDE shows overlap between disulphide reduction and hydrogen evolution. These effects are attributable to strong reactant adsorption with a calculated surface coverage close to 100%. A Tafel slope of −185 mV per decade is found with a cathodic transfer coefficient of 0.32 and a formal rate constant of 6.7 × 10−9 m s−1. The relative merits of steady state voltammetry at a mercury-plated copper RDE and linear sweep voltammetry at the SMDE are discussed, as is the mechanism of l-cysteine hydrochloride formation.
|Keywords:||l-cysteine hydrochloride, l-cystine hydrochloride, mercury-plated copper, rotating disc, stationary mercury drop|
|Subjects:||T Technology > TP Chemical technology
Q Science > QD Chemistry
Q Science > QC Physics
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences
|Date Deposited:||21 Mar 2006|
|Last Modified:||27 Mar 2014 18:12|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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