Abstract
A ternary mixed oxide containing SnO2, RuO2 and IrO2 was shown to exhibit a more stable electrocatalytic behaviour than simpler catalysts consisting of noble metal oxides only. X-ray diffraction and transmission electron microscopy were used to characterize the structure of these oxide catalysts. It was found that precipitation of the fine catalyst powders resulted in the formation of a mixed (Sn, Ru, Ir)O2 rutile phase. This phase was shown to be thermodynamically unstable, decomposing to SnO2 and (Ru, Ir)O2 on annealing at 800° C. X-ray photoelectron spectroscopy revealed that the surface composition of these mixed oxide catalysts varies considerably from the bulk composition. The formation of such metastable, mixed oxides is discussed.
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Hutchings, R., Müller, K., Kötz, R. et al. A structural investigation of stabilized oxygen evolution catalysts. J Mater Sci 19, 3987–3994 (1984). https://doi.org/10.1007/BF00980762
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DOI: https://doi.org/10.1007/BF00980762