The electrochemical reduction of hydrogen peroxide on polycrystalline copper in borax buffer
Chemistry Department, University of Liverpool, Liverpool L69 3BX United Kingdom Journal of electroanalytical chemistry
(Impact Factor: 2.73).
08/1994; 374(1-2):179-187. DOI: 10.1016/0022-0728(94)03342-0
The electrochemical reduction of hydrogen peroxide on copper electrodes in a borax buffer has been studied. The effects of surface oxidation and chloride ions in the electrolyte have been investigated. Hydrogen peroxide can be electrochemically reduced on Cu(I) oxidized surfaces. In the absence of chloride, the reduction is catalysed by a redox cycle involving the Cu(I)/Cu(II) couple. In chloride-containing solutions, the surface oxides are dissolved and the reduction becomes more irreversible. There appears to be a change in the reduction mechanism at potentials more negative than −0.45 V.
Available from: Samuel P Hernández-Rivera
- "Ordinarily, noble metallic electrodes are used for electroanalytical processes because of their stability in the electrolytes  . Non-noble metals are not preferred because they corrode in aqueous solutions. "
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ABSTRACT: Detection of 2,4-dinitrotoluene (DNT), which is a common impurity in 2,4,6-trinitrotoluene (TNT)-based explosives is a point of focus in the fight against act of terrorism. In this study, the donor based electrode for the detection of DNT was synthesized by modifying the surface of carbon fiber material with zero valent silver (Ag) via chemical deposition. DNT detection was conducted electrochemically in aqueous media of pH 6.0. The cyclic voltammetric oxidation of DNT is diffusion controlled with detection sensitivity increasing with Ag loading of the electrode. Nevertheless, kinetic study given by Tafel slope and transfer coefficient (0.03 and 0.22 respectively) indicated slowly to moderate chemical reaction. The only oxidation product is benzoic acid, which suggests that the difference in performance of Ag/C electrode compared to other available materials is directly ascribable to the electrode fabricated in this study. Detection limit of DNT was 5 mu M with the electrode showing no signs of degradation after several cycles, and supported by surface behavior of characterized Ag/C electrode.
Electrochimica Acta 04/2013; 88:832-838. DOI:10.1016/j.electacta.2012.10.068 · 4.50 Impact Factor
Available from: Fraser King
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ABSTRACT: The potential dependence of the optical properties of a copper surface at potentials where CuO and Cu2O are reduced has been studied by in situ ellipsometry in 0.1 M borax. It is shown that a thin layer of a copper(I) oxide remains on the surface even after extensive reduction. It is proposed that these oxide films play an important role in the kinetics of oxygen and hydrogen peroxide reduction.
Journal of Electroanalytical Chemistry 04/1995; 386(1-2):165-171. DOI:10.1016/0022-0728(95)03828-5 · 2.87 Impact Factor
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