Rotating Ring Disk Electrode Study of the Hydrogen Peroxide Oxidation of Fe(II) and Cu(I) in Hydrochloric Acid

Skinner, James F.; Glasel, Arnold; Hsu, Li-Chien; Funt, B. Lionel

doi:10.1149/1.2129663

Cited by 25 publications

(10 citation statements)

References 27 publications

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“…In the present study, hydroxyl radical was generated electrochemically at a microelectrode tip and used for micropatterning the substrate with alkylsilane SAMs finally to obtain diaphorase-patterned substrates. The application of a potential pulse of 0.00 V vs Ag/AgCl reduces Fe 3+ to Fe 2+ , which was subsequently reacted with H 2 O 2 in solution to produce hydroxyl radical as follows: , …”

Section: Resultsmentioning

confidence: 99%

Microfabrication of Alkylsilanized Glass Substrate by Electrogenerated Hydroxyl Radical Using Scanning Electrochemical Microscopy

1997

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Scanning electrochemical microscopy (SECM) was used for localized electrogeneration of hydroxyl radical to create patterns with diaphorase on the substrates immobilized with self-assembled monolayers (SAMs) of four different alkylsilane derivatives. Hydroxyl radical was generated at an SECM tip (microelectrode) in a solution containing H2O2 and Fe3+ by applying a reduction potential pulse of 0.00 V vs Ag/AgCl. The electrogenerated hydroxyl radical degraded the SAMs and removed them from the glass surfaces. Diaphorase patterns were formed on the substrates by physical adsorption onto the hydrophobic area or by chemical linkage to the hydroxyl radical-attacked area. Local diaphorase activity was visualized by SECM by detecting the diaphorase-catalyzed current of ferrocenylmethanol coupled with oxidation of reduced nicotinamide adenine dinucleotide.

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Section: Resultsmentioning

confidence: 99%

Microfabrication of Alkylsilanized Glass Substrate by Electrogenerated Hydroxyl Radical Using Scanning Electrochemical Microscopy

1997

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“…The kinetics of the reaction of Fe(II) with hydrogen peroxide has been studied under different conditions and by means of different techniques. 17,[25][26][27][28][29][30] In this paper, we employ cyclic voltammetry for the characterization of this reaction, making use of the analytical expressions presented above. In Fig.…”

Section: Experimental Study Of the Reaction Of Fe(ii) With Hydrogen P...mentioning

confidence: 99%

Catalytic mechanism in cyclic voltammetry at disc electrodes: an analytical solution

Molina

González

Laborda

et al. 2011

Phys. Chem. Chem. Phys.

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The theory of cyclic voltammetry at disc electrodes and microelectrodes is developed for a system where the electroactive reactant is regenerated in solution using a catalyst. This catalytic process is of wide importance, not least in chemical sensing, and it can be characterized by the resulting peak current which is always larger than that of a simple electrochemical reaction; in contrast the reverse peak is always relatively diminished in size. From the theoretical point of view, the problem involves a complex physical situation with two-dimensional mass transport and non-uniform surface gradients. Because of this complexity, hitherto the treatment of this problem has been tackled mainly by means of numerical methods and so no analytical expression was available for the transient response of the catalytic mechanism in cyclic voltammetry when disc electrodes, the most popular practical geometry, are used. In this work, this gap is filled by presenting an analytical solution for the application of any sequence of potential pulses and, in particular, for cyclic voltammetry. The induction principle is applied to demonstrate mathematically that the superposition principle applies whatever the geometry of the electrode, which enabled us to obtain an analytical equation valid whatever the electrode size and the kinetics of the catalytic reaction. The theoretical results obtained are applied to the experimental study of the electrocatalytic Fenton reaction, determining the rate constant of the reduction of hydrogen peroxide by iron(II).

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“…Addition of H 2 O 2 to the experimental system increases the reduction peak in CSV, most probably as a consequence of an EC’ reaction pathway (Figure ). − …”

Section: Resultsmentioning

confidence: 99%

Electrochemistry of Copper in Polyacrylic Acid: The Electrode Mechanism and Analytical Application for Gaseous Hydrogen Peroxide Detection

et al. 2022

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Electrode reaction of copper(II) reduction in an aqueous solution of polyacrylic acid (PAA) is studied by means of cyclic staircase and square-wave voltammetry to establish a basis for an electrochemical sensor for gaseous hydrogen peroxide detection. It has been determined that the reduction mechanism at a glassy carbon electrode follows a two-step, consecutive electron transfer reaction scheme of Cu2+ to the final copper solid deposit, via the formation of the intermediate Cu+ ions, which are subject to a fast disproportionation reaction. Experimental data have been supported by theoretical considerations and simulations based on EC’E electrode mechanism, where E designates an electrode reaction, whereas C’ is a homogeneous regenerative chemical reaction. Estimated thermodynamic and kinetic data of the electrode mechanism suggest stabilization of the intermediate Cu+ form by PAA in comparison with a pure aqueous medium. Commercially available screen-printed carbon electrodes were covered with a film of 1% (mass percent) of aqueous PAA solution containing Cu2+ ions, which proves to be a promising platform for gaseous H2O2 detection, where the Cu2+/Cu+ couple serves as a redox mediator for H2O2 reduction, with a limit of detection at a sub-μg dm–3 concentration level in the gas phase.

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Rotating Ring Disk Electrode Study of the Hydrogen Peroxide Oxidation of Fe(II) and Cu(I) in Hydrochloric Acid

Cited by 25 publications

References 27 publications

Microfabrication of Alkylsilanized Glass Substrate by Electrogenerated Hydroxyl Radical Using Scanning Electrochemical Microscopy

Microfabrication of Alkylsilanized Glass Substrate by Electrogenerated Hydroxyl Radical Using Scanning Electrochemical Microscopy

Catalytic mechanism in cyclic voltammetry at disc electrodes: an analytical solution

Electrochemistry of Copper in Polyacrylic Acid: The Electrode Mechanism and Analytical Application for Gaseous Hydrogen Peroxide Detection

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