Heat treated electrochromic devices

Details Heat treated electrochromic devices Heat treated electrochromic devices

1978-06-27

1980-05-06

Davie, James W.

G02F 117

Patent

active

042014549

ABSTRACT:
Electrochromic devices based on anodic iridium oxide as the electrochromic material have been made. These devices exhibit long term stability, memory, and good response times, e.g., less than 80 msec. for reflectivity changes of about 70% (50 msec. for 50% changes). Devices using an anodic iridium oxide film immersed in a sulfate electrolyte have been operated for more than 6.times.10.sup.5 coloration/bleaching cycles at 0.5 Hz without noticeable change in properties. Response times and stability are also improved by a heat treatment of the anodic iridium oxide at temperatures between 40 and 100 degrees C.

REFERENCES:
Rand et al., "Electrochemical and Physiochemical Studies of Oxygen Layers on Iridium and Ruthium Electrodes", Proceedings of the Symposium on Electrode Materials and Processes for Energy Conversion and Storage, vol. 77-6 (1977), pp. 217-233.
Gottesfeld et al., "Electrochemical and Optical Studies of Thick Oxide Layers on Iridium and their Electrocatalytic Activities for the Oxygen Evolution Reaction", J. Electroanal. Chem. vol. 86, No. 1 (1978) pp. 89-104.
Rand et al., "Cyclic Voltommetric Studies on Iridium Electrodes in Sulfuric Acid Solutions-Nature of Oxygen Layer and Metal Dissolution", J. Electroanal. Chem. vol. 55, (1974) pp. 375-381.
Bold et al., "Studies on the Anodic Formation and Cathodic Reduction of the Oxygen Coverage on Rhodium and Iridium", Electrochimica Acta, 5, (1961), pp. 169-179.

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