Effect of preparation on the surface and electrocatalytic properties of RuO2 + IrO2 mixed oxide electrodes

RuO 2 + IrO 2 electrodes of various compositions from 0 to 100% RuO 2 have been prepared by thermal decomposition of RuCl 3 + IrCl 3 in isopropanol solutions. The surface and electrocatalytic properties have been investigated by voltammetric curves, ex situ XPS analysis, and O 2 evolution. Dramatic...

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Bibliographic Details
Published in:Materials chemistry and physics 1989-06, Vol.22 (1), p.231-247
Main Authors: Angelinetta, C., Trasatti, S., Atanasoska, Lj.D., Minevski, Z.S., Atanasoski, R.T.
Format: Article
Language:English
Subjects:
Chemistry
Electrochemistry
Exact sciences and technology
General and physical chemistry
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Summary:RuO 2 + IrO 2 electrodes of various compositions from 0 to 100% RuO 2 have been prepared by thermal decomposition of RuCl 3 + IrCl 3 in isopropanol solutions. The surface and electrocatalytic properties have been investigated by voltammetric curves, ex situ XPS analysis, and O 2 evolution. Dramatic differences have been observed with respect to mixed oxides prepared from an aqueous solution of the precursors in a previous work. In situ surface analysis based on some features of the voltammetric curves has proved to be as sensitive and accurate as XPS. The data have shown that the surface is more enriched with Ir than in the previous work. Electrocatalytic results have been explained in terms of additive behaviour of the two components. It is concluded that surface enrichment and bulk inhomogeneity go parallel, the samples prepared from aqueous solutions showing some synergetic effects which are absent in the case where the precursors are dissolved in isopropanol.
ISSN:0254-0584
1879-3312
DOI:10.1016/0254-0584(89)90039-4