Abstract
Electrochemical properties of evaporated amorphous films on conductive glass substrates have been studied in propylene carbonate electrolytes, and the degradation of the electrochromic activity of the film on storage in the electrolyte and the prevention of the degradation of the film have been investigated by cyclic voltammetry. The films have also been analyzed by XPS, SIMS, and FT‐IR spectra. We have confirmed that the thermodynamic degradation is accelerated by and in the electrolyte. It is proposed that: first, contributes to the change of into ; second, Li+ exchanges with the H+ of ; and then these reactions result in the formation of ; and, consequently, in the negative shift of the cathodic reaction potential of the film. We have also confirmed that the degradation is prevented by addition of an acid, such as or acrylic acid, to the PC electrolyte and by using as a supporting electrolyte in place of .
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