New Complementary Electrochromic System Based on Polypyrrole-prussian Blue Composite, a Benzylviologen Polymer, and Poly(vinylpyrrolidone)/potassium Sulfate Aqueous Electrolyte
A new redox complementary electrochromic system is described that is based on electrode surface confined electrochromic polymers. Emphasis is given on the synergism achieved with the implementation of the complementary counter electrode technology: polypyrrole-prussian blue (PP-PB) composite was employed as the oxidatively colored material, and a viologen polymer (pBPQ) derived from N,N′-bis[p-(trimethoxysuyl)benzyl]-4,4′-bipyridinium dichloride (BPQ) was used as the reductively colored material. A viscous aqueous solution of poly(vinylpyrrolidone) (PVP)/K2SO4 was used as the electrolyte. To our knowledge, this is the first example of a complementary electrochromic system where both electrochromic materials are electrode surface confined electrochromic polymers. In this paper, the electrochromic materials and the electrolyte are characterized individually, and their properties are discussed in relation to the performance of the electrochromic system. On the basis of the electrochromic system mentioned above, two terminal transmissive and reflective 4 in. × 4 in. electrochromic devices are able to switch from colorless (A400-800 ≃ 0.15-0.25) to blue (A650 ≃ 1.35) in about 3-5 s, with the application of 0.8-0.9 V across the two electrodes. © 1992 American Chemical Society.
N. Leventis and Y. C. Chung, "New Complementary Electrochromic System Based on Polypyrrole-prussian Blue Composite, a Benzylviologen Polymer, and Poly(vinylpyrrolidone)/potassium Sulfate Aqueous Electrolyte," Chemistry of Materials, American Chemical Society (ACS), Jan 1992.
The definitive version is available at http://dx.doi.org/10.1021/cm00024a051
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© 1992 American Chemical Society (ACS), All rights reserved.