Nickel-Chromium Electrode as a Detector in Flow-Injection Amperometry: Determination of Glycerol

Mattos, Ivanildo Luiz de; Melo, D. D.; Zagatto, Elias A.G.

doi:10.2116/analsci.15.537

Cited by 12 publications

(4 citation statements)

References 10 publications

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“…The Ni(III) species is generated on the electrode surface at potentials in the region 0f 0.4 V to 0.5 V vs Ag/AgCl. The reactions are [6][7][8][9][10][11] …”

Section: Introductionmentioning

confidence: 99%

Utilization of Special Potential Scan Programs for Cyclic Voltammetric Development of Different Nickel Oxide-Hydroxide Species on Ni Based Electrodes

Pissinis¹,

Sereno²,

Marioli³

2012

OJPC

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Special potential scan programs were designed for cyclic voltammetric development of β-NiOOH or γ-NiOOH/ β-NiOOH mixtures on the surface of nickel or nickel-chromium (80:20) alloy electrodes in NaOH 0.10 M. The programs consisted on changing the anodic or cathodic switching limit to facilitate the chemical reactions taking place either between Ni(II) hydroxides or between Ni(III) oxides-hydroxides. The electrochemical charge density under the oxidative wave, observed at Ni or Ni-Cr electrode surfaces at approximately 0.48 V (vs SCE), remained almost constant with the number of cv cycles after approximately 600 cv cycles at 0.050 V/s. Thus, it can be suggested that a stable proportion of Ni(II)/Ni(III) oxides-hydroxides was obtained on the electrode surfaces. The relative amounts of β-NiOOH or γ-NiOOH species were calculated from the electrochemical charges under their reduction waves in the voltammetric experiments. Higher charge densities were always obtained with Ni-Cr alloy electrodes as compared to pure Ni electrodes. Linear relationships were obtained in our study on the dependence of the oxidative peak current with the square root of the scan rate at a scan rate range between 0.01 V/s and 0.16 V/s.

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“…The Ni(III) species is generated on the electrode surface at potentials in the region 0f 0.4 V to 0.5 V vs Ag/AgCl. The reactions are [6][7][8][9][10][11] …”

Section: Introductionmentioning

confidence: 99%

Utilization of Special Potential Scan Programs for Cyclic Voltammetric Development of Different Nickel Oxide-Hydroxide Species on Ni Based Electrodes

Pissinis¹,

Sereno²,

Marioli³

2012

OJPC

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“…Ni(II) is present as Ni(OH) 2 when in an alkaline medium, and is electrooxidized to the catalytic NiOOH at moderately low potentials of ca. 400 mV [13]. It is this Ni 2þ /Ni 3þ redox couple that is utilized in the electrocatalysis of alcohols, with the newly formed NiOOH oxidizing the alcohol and reverting back to its Ni(OH) 2 state.…”

Section: Introductionmentioning

confidence: 99%

The Fabrication and Characterization of a Nickel Nanoparticle Modified Boron Doped Diamond Electrode for Electrocatalysis of Primary Alcohol Oxidation

Stradiotto

Toghill²,

Liu³

et al. 2009

Electroanalysis

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We report the fabrication of a Ni nanoparticle modified BDD electrode and its application in the electrocatalysis of primary alcohol electrooxidation. Modification was achieved via electrodeposition from Ni(NO 3 ) 2 dissolved in sodium acetate solution (pH 5). Characterization of the Ni-modified BDD (Ni-BDD) was performed using ex situ atomic force microscopy (AFM) and high resolution scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDX). Large nanoparticles of nickel were observed on the BDD surface ranging 5 to 690 nm in height and 0.18 mm À3 in volume, and an average number density of ca. 13 Â 10 6 nanoparticles cm À2was determined. The large range of sizes suggests progressive rather than instantaneous nucleation and growth. Electrocatalysis of ethanol and glycerol, was conducted in an alkaline medium using an unmodified BDD, Ni-BDD and a bulk Ni macro electrode. The Ni-BDD electrode gave the better electrocatalytic performance, with glycerol showing the greatest sensitivity. Linear calibration plots were obtained for the ethanol and glycerol additions over concentration ranges of 2.8 -28.0 mM and 23 -230 mM respectively. This gave an ethanol limit of detection of 1.7 mM and sensitivity of 0.31 mA/M, and the glycerol a limit of detection of 10.3 mM with a sensitivity of 35 mA/M.

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“…Glycerol is involved in almost all applications of trihydric alcohols, e.g., as a component of pharmaceuticals, solvents, plasticizers, cosmetics, and food products. 1,2 Also, glycerol can be regarded as a very important indicator of quality and authenticity of food and alcoholic beverages. Glycerol is a secondary product in wine fermentation, being a component of high quality wines.…”

Section: Introductionmentioning

confidence: 99%

“…3,17 Although, several non-enzymatic glycerol amperometric detection methods using a transition metal oxide catalyst electrode 18 and chemically modified electrodes based on copper, cobalt, and nickel have been also reported. 2,19,20 According to the literature, 13 the direct electrochemical detection represents the most successful approach for glycerol determination because of its sensitivity, reliability, and cost effectiveness.…”

Section: Introductionmentioning

confidence: 99%

Non-enzymatic electrochemical detection of glycerol on boron-doped diamond electrode

Pop

Manea

Radovan

et al. 2012

Analyst

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A non-enzymatic direct electrochemical glycerol detection method at a commercial boron-doped diamond (BDD) electrode in 0.1 M NaOH supporting electrolyte was developed. All the used electrochemical techniques proved useful features for the oxidation and direct amperometric determination of glycerol at a BDD electrode in 0.1 M NaOH aqueous solution. It was found that the direct electrooxidation of glycerol on the BDD electrode requires both adsorbed glycerol and hydroxyls at the electrode surface. Also, the sp(2) carbon did not allow enhancement of the glycerol oxidation process. The electronalytical sensitivity for the determination of glycerol at the BDD electrode ranged from 0.040 to 0.226 μA mM(-1) as a function of the technique used. The highest electroanalytical sensitivity for the determination of glycerol at the BDD electrode was reached in batch system amperometric quantification under stirring conditions. Performed recovery studies indicated that it is possible to determine glycerol in real samples, and the proposed batch system analysis-based methodology can be a valuable tool for practical glycerol analysis.

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Nickel-Chromium Electrode as a Detector in Flow-Injection Amperometry: Determination of Glycerol

Cited by 12 publications

References 10 publications

Utilization of Special Potential Scan Programs for Cyclic Voltammetric Development of Different Nickel Oxide-Hydroxide Species on Ni Based Electrodes

Utilization of Special Potential Scan Programs for Cyclic Voltammetric Development of Different Nickel Oxide-Hydroxide Species on Ni Based Electrodes

The Fabrication and Characterization of a Nickel Nanoparticle Modified Boron Doped Diamond Electrode for Electrocatalysis of Primary Alcohol Oxidation

Non-enzymatic electrochemical detection of glycerol on boron-doped diamond electrode

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