Electrochemical activation of carbon electrodes in base:  minimization of dopamine adsorption and electrode capacitance

Anjo, Dennis M.; Kahr, Michael.; Khodabakhsh, Mohammadreza; Nowinski, Stuart A.; Wanger, Michael.

doi:10.1021/ac00198a004

Cited by 179 publications

(95 citation statements)

References 35 publications

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“…O-GCE exhibited a larger area, owing to the treatment removing passive films over the material and giving active sites onto the electrode surface. This effect is more evident for k 0 value evidencing the increase of the electrochemical performances of the pretreated GC [20]. CB, MWCNT, and O-MWCNT are nanomaterials, and, for this reason, are expected that they have the larger areas.…”

Section: Surface and Electrochemicalmentioning

confidence: 88%

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NADH Oxidation onto Different Carbon-Based Sensors: Effect of Structure and Surface-Oxygenated Groups

et al. 2018

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Different carbon-based materials have been compared for the development of NADH sensors: glassy carbon electrodes (GCE), multiwalled carbon nanotubes (MWCNT), and carbon black (CB). The GCE and MWCNT has been subjected to oxidative pretreatment to study the influence of oxidative groups for NADH oxidation. The materials had been characterized by FT-IR to identify the surface composition. The response of bare (GC) and GC/modified electrodes toward potassium ferricyanide have been employed to obtain information about the electroactive area and electron transfer rate. Studies of NAD + /NADH redox behavior showed that MWCNT and GCE exhibit high degree of passivation while CB shows no fouling effects. Catalytic effect of surface-oxygenated groups was also proved for GCE and MWCNT, and both, O-GCE and O-MWCNT, exhibited a lower oxidation overpotential compared to the respective untreated materials. Chronoamperometric quantification showed a linear dependence between 2-18 μmol·L −1 and a detection limits of 6.2 μmol·L −1 (GCE), 5.4 μmol·L −1 (O-GCE), 3.2 μmol·L −1 (GCE/ CB), 9.6 μmol·L −1 (GCE/MWCNT), and 4.9 μmol·L −1 (GCE/O-MWCNT) were obtained. The analytical performances suggest that a careful choice of the material for NADH sensing is necessary depending on the sensor application.

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Section: Surface and Electrochemicalmentioning

confidence: 88%

“…O-GCE was obtained by electrochemical oxidation in basic media (KOH 1 M) according to the procedure reported by Anjo et al [20]. Oxidation was carried out by fixing the potential at 1.2 V for 5 minutes until a stable current signal was achieved.…”

Section: Preparation Of Electrodesmentioning

confidence: 99%

NADH Oxidation onto Different Carbon-Based Sensors: Effect of Structure and Surface-Oxygenated Groups

et al. 2018

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“…After these pretreatments, it was dipped into a 0.1 mol/L NaOH solution (pH = 13), and the potential +1.2 V was held for 5 min. 26 In spectroelectrochemical experiments, the platinum working electrode was polished with a 0.05 µm alumina suspension to a mirror finish, then sonicated and washed successively with 1:1 HNO3, and double-distilled water.…”

Section: Methodsmentioning

confidence: 99%

Spectroelectrochemistry Study on the Electrochemical Reduction of Ethidium Bromide

Wang

et al. 2002

ANAL. SCI.

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The electrochemical reduction mechanism of ethidium bromide was first studied by spectroelectrochemistry. This reduction was proved to be a two-step process by cyclic voltammetry, differential pulse voltammetry and spectroelectrochemistry, in which each step was proved to be a one-electron transfer process by a spectropotentiostatic fluorescence technique. Hydroethidine was confirmed to be the final product by comparing the spectrum of the product of the electrochemical reduction to that of the product of the chemical reduction of ethidium bromide, and a carboncentered radical was concluded to be a reasonable intermediate product during the electrochemical reduction of ethidium bromide.

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“…Anodic activation of the graphite in acidic media produced a layer of graphite oxide on the electrode surface. 7,8 The electrode activation was carried out as described by Arbab-Zavar and Hashemi. 9 Several acids such as HCl, HNO3 and H2SO4 were examined as the cell electrolytes.…”

Section: Electrodes and Electrolytesmentioning

confidence: 99%

Determination of Mercury(II) Ion by Electrochemical Cold Vapor Generation Atomic Absorption Spectrometry

et al. 2003

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Electrochemical activation of carbon electrodes in base: minimization of dopamine adsorption and electrode capacitance

Cited by 179 publications

References 35 publications

NADH Oxidation onto Different Carbon-Based Sensors: Effect of Structure and Surface-Oxygenated Groups

NADH Oxidation onto Different Carbon-Based Sensors: Effect of Structure and Surface-Oxygenated Groups

Spectroelectrochemistry Study on the Electrochemical Reduction of Ethidium Bromide

Determination of Mercury(II) Ion by Electrochemical Cold Vapor Generation Atomic Absorption Spectrometry

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