Voltammetry of hydroxide ion in aqueous solutions on gold microelectrodes

Abdelsalam, Mamdouh E.; Denuault, Guy; Baldo, M. Antonietta; Daniele, Salvatore

doi:10.1016/s0022-0728(98)00053-9

Cited by 31 publications

(40 citation statements)

References 6 publications

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“…5b). On Pt microdiscs the wave for OH − oxidation appears at more positive potentials [74][75][76] but its contribution should not be neglected in view of the large bulk concentration of OH − . The TSV-SECM data recorded with E T = 0.2 V shows no appreciable evidence for HO 2 − formation (Fig.…”

Section: Hydrogen Peroxide Formationmentioning

confidence: 99%

Electrochemical analysis of nanostructured iron oxides using cyclic voltammetry and scanning electrochemical microscopy

Bülter

Denuault

Mátéfi‐Tempfli

et al. 2016

Electrochimica Acta

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Section: Hydrogen Peroxide Formationmentioning

confidence: 99%

Electrochemical analysis of nanostructured iron oxides using cyclic voltammetry and scanning electrochemical microscopy

Bülter

Denuault

Mátéfi‐Tempfli

et al. 2016

Electrochimica Acta

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“…[1][2][3][4][5][6][7][8] It is well established that the concentration of dilute solutions of either strong or weak acids can be determined by monitoring the reduction wave of hydrogen ions under steady-state conditions, at platinum microelectrodes. [2][3][4]8,9 By analogy, the concentration of bases can be monitored by the direct oxidation of hydroxide ions (Eq.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the height of the wave was found to be proportional to the hydroxide ion over a wide concentration range. 1,5,6 From the amperometric response for hydroxide oxidation it has been shown that pH can be determined. 7 4OH -/ O2 + 2H2O + 4e -…”

Section: Introductionmentioning

confidence: 99%

Gold Ultra-microelectrode Arrays: Application to the Steady-State Voltammetry of Hydroxide Ion in Aqueous Solution

et al. 2006

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Experimental Reagents and instrumentationPotassium chloride (KCl), potassium hexacyanoferrate(II) (K4Fe(CN)6), sodium sulfate anhydrous (Na2SO4) and sodium hydroxide (NaOH) were purchased from Panreac. All chemicals were analytical reagent grade. Gold ultra-microelectrode arrays are used to explore the electrochemical oxidation of hydroxide ions and are shown to be analytical useful. Two types of ultra-microelectrode arrays are used; the first consist of 256 individual electrodes of 5 µm in radius, 170 of which are electrochemically active in a cubic arrangement which are separated from their nearest neighbour by a distance of 100 µm. The second array compromises 2597 electrodes of 2.5 µm in radius and of which 1550 of which are electrochemically active in a hexagonal arrangement separated by the nearest neighbour by 55 µm.Well defined voltammetric waves are found with peak currents proportional to the concentration of hydroxide ions in the range 50 µM to 1 mM. Detection limits of 20 µM using the 170 ultra-microelectrode and 10 µM with the 1550 ultramicroelectrode array are shown to be possible but with a higher sensitivity of 4 mA M -1 observed using the 1550 ultramicroelectrode array compared to 1.2 mA M -1 with the 170 ultra-microelectrode array.

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“…It is worth mentioning that the hydroxide oxidation process has been commonly reported on noble metal electrodes as gold electrodes [30][31][32], however in our knowledge there are surprisingly few reports for hydroxide oxidation on HT [33,34].…”

Section: Electrochemical Behaviormentioning

confidence: 97%

Electrochemical characterization of carbon paste electrodes modified with MgZnGa and ZnGaAl hydrotalcite-like compounds

Aguilar-Vargas

Valente

González

2013

J Solid State Electrochem

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Two hydrotalcite-like compounds (HTs) were synthesized by coprecipitation. The electrochemical behavior of MgZnGa ([Mg 0.58 Zn 0.17 Ga 0.25 (OH) 2 ] (CO 3 ) 2− 0.125 1.5 H 2 O) and ZnGaAl ([Zn 0.75 Ga 0.19 Al 0.06 (OH) 2 ] (CO 3 ) 2− 0.125 ·1.5 H 2 O) Hydrotalcite-like compounds (HTs) was studied in NaOH at different concentrations. Voltammetric and chronoamperometric studies were performed to identify oxidation and reduction processes and the effect of the cations in total reactivity. Electrocatalytic effect of HTs on hydroxide electrochemical oxidation shows better performance of MgZnGa; this is apparently due to the presence of Mg and a greater amount of Ga 3+ in the lattice of this HT. As far as reduction is concerned, Zn(II) reduction process is observed within the lattices of both HTs and is influenced by both the amount of OH − in the solution and the potential which the previous oxidation has been performed.

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Voltammetry of hydroxide ion in aqueous solutions on gold microelectrodes

Cited by 31 publications

References 6 publications

Electrochemical analysis of nanostructured iron oxides using cyclic voltammetry and scanning electrochemical microscopy

Electrochemical analysis of nanostructured iron oxides using cyclic voltammetry and scanning electrochemical microscopy

Gold Ultra-microelectrode Arrays: Application to the Steady-State Voltammetry of Hydroxide Ion in Aqueous Solution

Electrochemical characterization of carbon paste electrodes modified with MgZnGa and ZnGaAl hydrotalcite-like compounds

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