Electrochemical oxidation of hydrogen peroxide at platinum electrodes. Part II: Effect of potential

Simon B. Hall; Emad A. Khudaish; Alan L. Hart

Electrochemical oxidation of hydrogen peroxide at platinum electrodes. Part II: Effect of potential

Simon B. Hall^*, Emad A. Khudaish, Alan L. Hart

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

106 Citations (Scopus)

Abstract

The electrochemical oxidation of H₂O₂ at a platinum rotating disc electrode was studied at pH 7.26 for the [H₂O₂] range 0-70 mM, rotation rates 630-10000 rpm and anodic potential +264 to +712 mV vs Ag/AgCl using staircase potentiometry. A mechanism is proposed to account for the steady-state current as a function of rotation rate, [H₂O₂] and anodic potential. This mechanism involves reversible binding of H₂O₂ to electrochemically generated Pt(II) surface sites, reduction of the site and inhibiting competitive adsorption of H⁺ and O₂. Potential-invariant values of the constants for H₂O₂, H⁺ and O₂ binding are determined and the rate constants for the reduction and the re-oxidation of the binding site as a function of potential are evaluated.

Original language	English
Pages (from-to)	2015-2024
Number of pages	10
Journal	Electrochimica Acta
Volume	43
Issue number	14-15
Publication status	Published - May 7 1998
Externally published	Yes

Keywords

Hydrogen peroxide
Mechanism
Oxidation
Platinum
Rotating disc electrode

ASJC Scopus subject areas

Chemical Engineering(all)
Analytical Chemistry
Electrochemistry

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abstract = "The electrochemical oxidation of H2O2 at a platinum rotating disc electrode was studied at pH 7.26 for the [H2O2] range 0-70 mM, rotation rates 630-10000 rpm and anodic potential +264 to +712 mV vs Ag/AgCl using staircase potentiometry. A mechanism is proposed to account for the steady-state current as a function of rotation rate, [H2O2] and anodic potential. This mechanism involves reversible binding of H2O2 to electrochemically generated Pt(II) surface sites, reduction of the site and inhibiting competitive adsorption of H+ and O2. Potential-invariant values of the constants for H2O2, H+ and O2 binding are determined and the rate constants for the reduction and the re-oxidation of the binding site as a function of potential are evaluated.",

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TY - JOUR

T1 - Electrochemical oxidation of hydrogen peroxide at platinum electrodes. Part II

T2 - Effect of potential

AU - Hall, Simon B.

AU - Khudaish, Emad A.

AU - Hart, Alan L.

PY - 1998/5/7

Y1 - 1998/5/7

N2 - The electrochemical oxidation of H2O2 at a platinum rotating disc electrode was studied at pH 7.26 for the [H2O2] range 0-70 mM, rotation rates 630-10000 rpm and anodic potential +264 to +712 mV vs Ag/AgCl using staircase potentiometry. A mechanism is proposed to account for the steady-state current as a function of rotation rate, [H2O2] and anodic potential. This mechanism involves reversible binding of H2O2 to electrochemically generated Pt(II) surface sites, reduction of the site and inhibiting competitive adsorption of H+ and O2. Potential-invariant values of the constants for H2O2, H+ and O2 binding are determined and the rate constants for the reduction and the re-oxidation of the binding site as a function of potential are evaluated.

AB - The electrochemical oxidation of H2O2 at a platinum rotating disc electrode was studied at pH 7.26 for the [H2O2] range 0-70 mM, rotation rates 630-10000 rpm and anodic potential +264 to +712 mV vs Ag/AgCl using staircase potentiometry. A mechanism is proposed to account for the steady-state current as a function of rotation rate, [H2O2] and anodic potential. This mechanism involves reversible binding of H2O2 to electrochemically generated Pt(II) surface sites, reduction of the site and inhibiting competitive adsorption of H+ and O2. Potential-invariant values of the constants for H2O2, H+ and O2 binding are determined and the rate constants for the reduction and the re-oxidation of the binding site as a function of potential are evaluated.

KW - Hydrogen peroxide

KW - Mechanism

KW - Oxidation

KW - Platinum

KW - Rotating disc electrode

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JO - Electrochimica Acta

JF - Electrochimica Acta

SN - 0013-4686

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ER -

Electrochemical oxidation of hydrogen peroxide at platinum electrodes. Part II: Effect of potential

Abstract

Keywords

ASJC Scopus subject areas

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