The formation processes of RuO2/TiO2, IrO2/TiO2 and IrO2/ZrO2 film electrodes were studied by combined thermoanal. and mass-spectrometric methods. The obtained materials were characterized by cyclic voltammetry (CV). The precursor path leading to mixed oxides for the 1st two groups of materials, consists of several stages, including solvent desorption, oxidative cracking, combination, noble-metal chloride decompn. Min. of the temp. of chlorine release and org. combustion were obsd. for precursor salt mixts. with intermediate-low noble-metal concns. The microstructural study, carried out by wide-angle x-ray scattering (WAXS) showed that solid solns. are formed within quite wide compn. ranges for TiO2-stabilized materials. For the IrO2/ZrO2 system, segregation of amorphous ZrO2 takes place for IrO2 concns. 80 mol.-%. For the TiO2-stabilized samples, the characterization by cyclic voltammetry showed that maxima of charge-storage capacity are obsd. for those electrodes whose compn. is in the range of min. temp. for the precursor reaction. A dependence of the faradaic voltammetric charge on the carbon content of the electrode films, as detd. by nuclear reaction anal. (NRA), has been shown. The exptl. results were explained hypothesizing that min. of pyrolysis temp. involve less favorable conditions for rearrangements in the reacting films, and, consequently, larger degree of defectivity. In the case of IrO2/ZrO2 electrodes, the segregation of the amorphous ZrO2 phase seems to be main reason for the max. of charge-storage capacity obsd. at 80 mol-% of IrO2. In the case of IrO2/ZrO2 electrodes, the segregation of the amorphous ZrO2 phase seems to be main reason for the max. of charge-storage capacity obsd. at 80 mol-% of IrO2.

Preparation and characterization of mixed-oxide electrocatalysts based on RuO2 and IrO2

DE BATTISTI, Achille;
1995

Abstract

The formation processes of RuO2/TiO2, IrO2/TiO2 and IrO2/ZrO2 film electrodes were studied by combined thermoanal. and mass-spectrometric methods. The obtained materials were characterized by cyclic voltammetry (CV). The precursor path leading to mixed oxides for the 1st two groups of materials, consists of several stages, including solvent desorption, oxidative cracking, combination, noble-metal chloride decompn. Min. of the temp. of chlorine release and org. combustion were obsd. for precursor salt mixts. with intermediate-low noble-metal concns. The microstructural study, carried out by wide-angle x-ray scattering (WAXS) showed that solid solns. are formed within quite wide compn. ranges for TiO2-stabilized materials. For the IrO2/ZrO2 system, segregation of amorphous ZrO2 takes place for IrO2 concns. 80 mol.-%. For the TiO2-stabilized samples, the characterization by cyclic voltammetry showed that maxima of charge-storage capacity are obsd. for those electrodes whose compn. is in the range of min. temp. for the precursor reaction. A dependence of the faradaic voltammetric charge on the carbon content of the electrode films, as detd. by nuclear reaction anal. (NRA), has been shown. The exptl. results were explained hypothesizing that min. of pyrolysis temp. involve less favorable conditions for rearrangements in the reacting films, and, consequently, larger degree of defectivity. In the case of IrO2/ZrO2 electrodes, the segregation of the amorphous ZrO2 phase seems to be main reason for the max. of charge-storage capacity obsd. at 80 mol-% of IrO2. In the case of IrO2/ZrO2 electrodes, the segregation of the amorphous ZrO2 phase seems to be main reason for the max. of charge-storage capacity obsd. at 80 mol-% of IrO2.
1995
DE BATTISTI, Achille; Battaglin, G.; Benedetti, A.; Kristof, J.; Liszi, J.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1200759
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