Abstract
La 0.6Ca 0.4Co 0.8Ir 0.2O 3 was prepared by solid state reaction synthesis from mixtures of La(NO 3) 3·6H 2O, Ca(NO 3) 2·4H 2O, Co(NO 3) 3·6H 2O, and IrO 2 at stoichiometric ratio. Images from scanning electron microscopy on the as-synthesized powders exhibited particles in irregular shape at 100–250 nm in size. X-ray diffraction analysis confirmed the formation of perovskite without the rutile signals from IrO 2, suggesting successful incorporation of Ir 4+ at the Co cation sites. The carbon nanocapsules (CNCs) were used as an electrocatalyst support. Electrodes for electrochemical measurements were fabricated by depositing mixtures of CNCs, La 0.6Ca 0.4Co 0.8Ir 0.2O 3, and polymeric binders on commercially available noncatalyzed gas diffusion electrodes. In alkaline electrolyte, the La 0.6Ca 0.4Co 0.8Ir 0.2O 3/CNCs demonstrated superior performances than those of La 0.6Ca 0.4CoO 3/CNCs and IrO 2/CNCs in both charging and discharging current–potential polarization measurements.
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