Influence of supporting electrolyte on ferricyanide reduction at a rotating disc electrode

Taama, W.M.; Plimley, R. E.; Scott, Keith

doi:10.1016/0013-4686(95)00390-8

Cited by 18 publications

(15 citation statements)

References 2 publications

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“…In the second 2-h period after cleaning the electrode, the limiting current value approached the theoretical value but dropped over time in a similar fashion as in the first 2-h period. The limiting current values obtained in K 2 CO 3 , dropped from 0.80 to 0.77 mA cm 22 , a drop of only 3% in comparison with the theoretical value and similar to the result obtained by Taama et al 26 In the next 2 h, a similar behavior was observed; return to the theoretical value and 3% drop with time. In the case of the KNO 3 electrolyte solution, the limiting current dropped from 0.8 to 0.78 mA cm…”

Section: Effect Of Background Electrolytesupporting

confidence: 89%

“…Taama et al 26 attributed the low values of limiting current obtained over a period of time during the reduction of ferricyanide ion in KOH electrolyte to a yellowish film formed on the surface of a stainless steel electrode because of the high pH of this solution. They showed that, for a well-polished nickel, platinum, and stainless steel electrode surfaces, there is little difference in the initial value of limiting currents measured in potassium hydroxide or potassium carbonate electrolytes.…”

Section: Effect Of Background Electrolytementioning

confidence: 99%

“…In this work, the experiments reported by Taama et al 26 were repeated adding two extra electrolytes: potassium nitrate and potassium sulphate. The former has been used as a background electrolyte for Fe(CN) 3À 6 reduction, 3 whereas there is no record of sulphate being used.…”

Section: Effect Of Background Electrolytementioning

confidence: 99%

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

Szánto¹,

Cleghorn

Ponce-de-León

et al. 2008

AIChE Journal

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in Wiley InterScience (www.interscience.wiley.com).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 (hexacyanoferrate III ) 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. 2008 American Institute of Chemical Engineers AIChE J, 54: [802][803][804][805][806][807][808][809][810] 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 IntroductionThe establishment of any electrochemical processes requires feasibility and process design studies. These preliminary works are normally carried out on pilot-scale laboratory electrolysers or in small laboratory electrochemical cells, and are essential to design the electrochemical reactor. The successful scale-up from laboratory to industry depends in great measure on the guidance obtained from the results of these investigations and from the continuous evaluation of the process after being implemented. The limiting currentThe most important figures of merit to be determined during the preliminary studies are often the current efficiency,

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Section: Effect Of Background Electrolytesupporting

confidence: 89%

Section: Effect Of Background Electrolytementioning

confidence: 99%

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

Szánto¹,

Cleghorn

Ponce-de-León

et al. 2008

AIChE Journal

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“…It is indicated that the peaks of 0.2 and 0.9 V are due to the redox reactions for the high-spin iron ions, Fe 3+/2+ , and the low-spin iron ions, Fe III=II ðCNÞ 3À=4À 6 , in the PB film, respectively [25]. The formal potential [26] and the electron transfer rate constant [27][28][29] of the FeðCNÞ 3À 6 =FeðCNÞ 4À 6 system change with the nature [28][29][30][31][32][33] and concentration [34] of the supporting electrolyte and even with the hexacyanoferrate concentration [34]. Electrogeneration of Prussian blue films from solutions of hexacyanoferrate complexes have been reported [35][36][37].…”

Section: Introductionmentioning

confidence: 97%

Electrochemical formation of Prussian blue films with a single ferricyanide solution on gold electrode

Abbaspour

Kamyabi

2005

Journal of Electroanalytical Chemistry

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“…Various researchers have also used this couple for evaluating mass transport conditions of electrochemical reactors using porous electrodes [15,[22][23][24][25][26]. A high concentration of K 2 CO 3 (potassium carbonate) or Na 2 CO 3 (sodium carbonate) has been recommended as a supporting electrolyte for the ferrocyanide/ferricyanide couple by a number of studies [21,[27][28]. Although, a higher conductivity can be achieved with a hydroxide electrolyte, it has been reported that potassium carbonate provides a more stable limiting current than potassium or sodium hydroxide [28][29].…”

Section: Electrolyte Systemmentioning

confidence: 99%

A membrane free electrochemical cell using porous flow-through graphite felt electrodes

2008

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This work describes the development and characterisation of an electrochemical cell which can be used to give high reactant conversion without the need for a membrane. The undivided cell uses two high porosity flowthrough graphite felt electrodes, with the products flowing through the back of each electrode. A series of tests have been conducted using an equimolar mixture of potassium hexacyanoferrate (II) and potassium hexacyanoferrate (III) to characterise the cell design and identify suitable operating conditions. It has been shown that high reactant conversion (in excess of 90%) can be achieved for high concentrations of redox species at low flow rates (superficial velocities of around 0.1 mm s -1 ). However, the cell voltage required to achieve high conversions increased with increasing concentration. Keywords Undivided cell Á Flow-through electrodes Á Redox species Á Potassium hexacyanoferrate (II) Á Potassium hexacyanoferrate (III) Nomenclature a Specific surface area (m 2 m -3 ) C 0 Feed concentration (mol dm -3 ) C 0 Outlet concentration (mol dm -3 ) E cell Cell potential (V) F Faraday constant (96,487 C mol -1 ) I Cell current (A) k m Mass transport coefficient (m s -1 ) L Porous electrode thickness (m) L a Active electrode thickness (m) n Number of electrons transferred per mole of reactants Q Volumetric flow rate of electrolyte (cm 3 s -1 ) Re Reynolds number u Mean flow velocity (m s -1 ) V Total volume of electrolyte reacted (m 3 ) W.E Working electrode X Reactant conversionGreek symbols a = k m a/u (m -1 ) / Current efficiency j Electrolyte conductivity (S m -1 )

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Influence of supporting electrolyte on ferricyanide reduction at a rotating disc electrode

Cited by 18 publications

References 2 publications

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

Electrochemical formation of Prussian blue films with a single ferricyanide solution on gold electrode

A membrane free electrochemical cell using porous flow-through graphite felt electrodes

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