Ruthenium nitrosyl nitrate has been used as a precursor to prepare Cl‐free
RuOx
with the scope of investigating the role of the residual chlorine present in
RuOx
obtained by thermal decomposition of
RuCl3
. Ti‐supported layers were prepared in the temperature range 270°–500°C. Surface and electrocatalytic properties have been investigated by means of voltammetric curves, Tafel plots, reaction order, and activation energy determinations. The results have shown that Cl‐free
RuOx
does not behave differently from
RuOx
containing Cl, although both the range of temperature where the stable oxide is formed and the surface morphology depend on the nature of the precursor.
ChemInform Abstract RuOx is deposited on Ti-substrates by thermal decomposition of either Ru(NO)(NO3)3 to prepare Cl-free RuOx or RuCl3 resulting in RuOx containing residual chlorine and the surface and electrocatalytic properties of the resulting electrode materials are compared. It is found that the activity of RuOx is not related to the presence of residual chlorine. However, the range of temp. at which stable RuOx is formed and the surface morphology of the product depends on the precursor.
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