The limiting current for reduction of ferricyanide ion at nickel: the importance of experimental conditions


Szánto, D.A., Cleghorn, S., Ponce de León, C. and Walsh, F.C. (2008) The limiting current for reduction of ferricyanide ion at nickel: the importance of experimental conditions. AIChE Journal, 54, (3), 802-810. (doi:10.1002/aic.11420).

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Original Publication URL: http://dx.doi.org/10.1002/aic.11420

Description/Abstract

Steady state, hydrodynamic voltammetry is a well established technique to measure the rate of mass transport of an electroactive species to, or from, a solid surface electrode in an aqueous electrolyte. Limiting current measurements during the reduction of ferricyanide (hexacyanoferrateIII) ion at a nickel rotating disc electrode (RDE) are critically considered, and the accuracy of the technique is quantitatively assessed. The importance of surface pretreatment, type of indifferent electrolyte, and the effect of sunlight are considered. Limiting current values can show large deviations from the values predicted by the Levich equation for laminar flow to a polished RDE when unsuitable conditions are employed, despite the appearance of well-defined limiting current plateaux. Using appropriate pretreatment and experimental procedures, the averaged mass transport coefficients or limiting currents values can be obtained, which are close to the values predicted by the Levich equation for laminar flow to a hydrodynamic smooth RDE.

Item Type: Article
ISSNs: 0001-1541 (print)
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Keywords: activation of electrodes, convective diffusion, electrochemical mass transport, ferricyanide hexacyanoferrate(III) ion, nickel electrode surfaces, limiting current, rotating disc electrode, pretreatment of electrode surfaces, rde, voltammetry
Subjects: T Technology > TP Chemical technology
Q Science > QD Chemistry
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 50295
Date Deposited: 13 Feb 2008
Last Modified: 27 Mar 2014 18:33
Contact Email Address: capla@soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/50295

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