Electrochromism in Iridium Oxide Films Prepared by Thermal Oxidation of Iridium‐Carbon Composite Films

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Abstract
Electrochromic iridium oxide films have been prepared by the thermal oxidation of iridium‐carbon composite films (Ir‐C films) obtained by evaporation of Ir from a graphite crucible with an electron gun. The XPS analysis indicates that the Ir‐to‐C ratio in the Ir‐C films lies in a range from 0.061 to 0.165. A change in the transmittance of the Ir‐C films begins when they are heated to 225°C or higher. The x‐ray diffractometry analysis shows that the thermally oxidized iridium oxide films (TOIROF's) are amorphous when they are heated to temperatures up to 300°C and polycrystalline when heated at a temperature of 350°C. The electrochemical measurements show that the degree of electrochromism of the TOIROF's is closely related to those structures. The coloration efficiency of the TOIROF's lies in a range from 13.5 to 15.4 cm2/C at a wavelength of 633 nm. The lifetime test of the TOIROF's has been carried out in electrolyte. Color‐bleach cycles of were recorded without degradation.

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