The limiting current for reduction of ferricyanide ion at nickel: the importance of experimental conditions
The limiting current for reduction of ferricyanide ion at nickel: the importance of experimental conditions
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.
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
802-810
Szánto, D.A.
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Cleghorn, S.
56d47986-c2d7-42b5-9efe-2034024335fc
Ponce de León, C.
508a312e-75ff-4bcb-9151-dacc424d755c
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2
29 January 2008
Szánto, D.A.
4c7f7c8c-7fb9-47d9-81bc-de9870b0ac61
Cleghorn, S.
56d47986-c2d7-42b5-9efe-2034024335fc
Ponce de León, C.
508a312e-75ff-4bcb-9151-dacc424d755c
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2
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), .
(doi:10.1002/aic.11420).
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.
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Submitted date: 4 December 2007
Published date: 29 January 2008
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
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 50295
URI: http://eprints.soton.ac.uk/id/eprint/50295
ISSN: 0001-1541
PURE UUID: 09560833-5a34-47f1-a1f6-31fbe21eafaa
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Date deposited: 13 Feb 2008
Last modified: 16 Mar 2024 03:43
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Author:
D.A. Szánto
Author:
S. Cleghorn
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