Abstract
The electrochemical (EC) properties and stability of hydrous ruthenium oxide (denoted as RuO x · nH 2O) and ruthenium–iridium oxide (denoted as (Ru+Ir)O y · mH 2O) were systematically investigated in 0.5 M H 2SO 4 by cyclic voltammetry (CV) and chronopotentiometry (CP). The EC characteristics of RuO x · nH 2O and (Ru+Ir)O y · mH 2O annealed at temperatures equal to/above 200 °C were demonstrated to be more applicable for the EC supercapacitors. The crystalline information of these oxides annealed in air for 2 h up to 300 °C was obtained from the X-ray diffraction (XRD) spectra. The morphologies of these oxide-coated electrodes were examined by a scanning electron microscope (SEM). The effect of annealing temperatures on the surface composition of (Ru+Ir)O y · mH 2O was studied by X-ray photoelectron spectroscopy (XPS).
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