Electrochemical Properties of Electrode Coatings Containing Highly Oxidatively Active Platinum Oxides

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Title:Electrochemical Properties of Electrode Coatings Containing Highly Oxidatively Active Platinum Oxides
Creators:
Hlavatý, Jaromír
Volke, Jiří
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 57, 3, pp. 429-438

Abstract

By time-programmed anodic and cathodic polarization (galvanostatic conditions and undivided cell) chemically stable coatings of hydrated higher valency platinum oxides were deposited from a 10% aqueous solution of alkali hydroxide saturated with PtO<sub>2</sub> on platinum, nickel, titanium, iron and glassy-carbon electrode supports. Their voltammograms yield anodic and cathodic peaks over the whole pH region (0.15 to 13.20). The peaks corresponding to the transformation of higher valency platinum oxides are developed at more positive values (cathodic peaks between +0.57 and -0.35 V, and anodic peaks from +0.88 to -0.23 V vs SCE). The peaks corresponding to the transformations of PtO<sub>2</sub> are located in a more negative region. Upon adding toluene or its derivatives their electrocatalytic oxidation over the whole pH region is intensified by increasing the temperature to 80 °C. The preparative coatings of hydrated platinum oxides prepared by the same technique on platinum grids were only deposited on a part of the electrode surface. The preparative electrolytic oxidation of toluene on these coatings leads only to low material yields: in 0.5 M H<sub>2</sub>SO<sub>4</sub> it gives 4% benzaldehyde and in 0.25 M NaOH even less, i.e. 3%. The linear dependence of the increase of peak currents in voltammograms of coatings plotted as a function of the cathodic polarization potential (applied in the preceding preparation in strongly acidic media) points to a liberation of alkali metal cations intercalated in the coating of hydrated higher valency platinum oxides during their deposition.

Title:Electrochemical Properties of Electrode Coatings Containing Highly Oxidatively Active Platinum Oxides
Creators:
Hlavatý, Jaromír
Volke, Jiří
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:57
Number:3
Page Range:pp. 429-438
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc19920429UNSPECIFIED
ID Code:34
Item Type:Article
Deposited On:06 Feb 2009 16:38
Last Modified:06 Feb 2009 15:38

Citation

Hlavatý, Jaromír; Volke, Jiří (1992) Electrochemical Properties of Electrode Coatings Containing Highly Oxidatively Active Platinum Oxides. Collection of Czechoslovak Chemical Communications, 57 (3). pp. 429-438. ISSN 0010-0765

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