NDLI: Electrocatalytic reduction of hydrogen peroxide at Prussian blue modified electrodes: a RDE study

Content Provider	Springer Nature Link
Author	Araminaitė, R. Garjonytė, R. Malinauskas, A.
Copyright Year	2009
Abstract	Electrocatalytic reduction of hydrogen peroxide at Prussian blue modified electrode has been studied with rotating disk electrode in pH 5.5 and 7.3 solutions. It has been shown that the electrocatalytic cathodic reduction obeys Koutecky–Levich relationship at electrode potentials ranging from 0.1 to −0.4 V vs. Ag/AgCl for low concentrations of peroxide not exceeding 0.3 mM. Within this potential window, the calculated kinetic cathodic current ranges within the limits of 2.15–6.09 and 1.00–3.60 mA cm−2 mM−1 for pH 5.5 and 7.3, respectively. For pH 5.5 and 7.3 solutions, a linear slope of the dependence of kinetic current on electrode potential of −10.8 and −2.89 mA cm−2 mM−1 V−1, respectively, has been obtained. At a higher concentration of peroxide, exceeding 0.6 mM, deviations from Koutecky–Levich relationship have been observed. These deviations appear more expressed at higher potentials and higher solution pH. The results obtained have been interpreted within the frame of two-step reaction mechanism, including (1) dissociative adsorption of hydrogen peroxide with the formation of OH radicals and (2) one-electron reduction of these radicals to OH− anions. At a higher concentration of peroxide, and especially at a higher pH, the second process becomes rate limiting.
Starting Page	149
Ending Page	155
Page Count	7
File Format	PDF
ISSN	14328488
Journal	Journal of Solid State Electrochemistry
Volume Number	14
Issue Number	1
e-ISSN	14330768
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-02-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Electrocatalysis Hydrogen peroxide Prussian blue Rotating disk electrode Modified electrode Electrical Engineering Condensed Matter Physics Characterization and Evaluation of Materials Industrial Chemistry/Chemical Engineering Analytical Chemistry Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science Electrical and Electronic Engineering Electrochemistry

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