M. , Deepa and Awadhia , Arvind and Bhandari, Shweta and Agrawal, S. L. (2008) Electrochromic performance of a poly(3,4-ethylenedioxythiophene)-Prussian blue device encompassing a free standing proton electrolyte film. Electrochimica Acta, 53 (24). 7266-7275. ISSN 0013-4686

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Electrochromic devices incorporating an electropolymerized poly(3,4-ethylenedioxythiophene) (PEDOT) film and a free standing, transparent film of a proton conducting polymer electrolyte with high ambient temperature ionic conductivity of 10−2 S cm−1 have been fabricated with and without the ion storage electrodeposited Prussian blue (PB) counter electrode layer. While coloration efficiency increases as a function of applied potential in the sole PEDOT device with largest values of CE(max,VIS) ∼ 120 cm2 C−1 and CE(max,NIR) ∼ 133 cm2 C−1 attained at Vc = −1.9 V, the PEDOT:PB device shows a digression from this trend. Much higher coloration efficiencies in the visible (247 cm2 C−1 at 570 nm) and NIR (116 cm2 C−1 at 1100 nm) regions are achieved for the PEDOT:PB device at a relatively lower reducing voltage of −0.8 V. The PEDOT:PB device shows fast switching redox process (tc = 2.6 s and tb = 1.3 s for a 50% optical contrast at 632.8 nm) and a highly reversible charge density as the ratio of Qinserted to Qextracted was found to vary between 0.8 and 1.0. When switched between the clear and blue states for 2000 cycles, the insignificant drop in peak current density maxima observed for the PEDOT:PB device, i.e. the good cycling stability, the facile fabrication of device assembly, the ease of scaling up the electrolyte and electrochromic coatings, indicate that this method can be adapted as a simple and inexpensive alternative to conventional electrochromic windows with high cost components.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Elsevier B.V.
Uncontrolled Keywords: Electrochromic device; Poly(3,4-ethylenedioxythiophene); Prussian blue; Proton electrolyte; Coloration efficiency
Subjects: Electrochemistry
Depositing User: Ms Neetu Chandra
Date Deposited: 07 Jan 2014 10:12
Last Modified: 07 Jan 2014 10:12
URI: http://npl.csircentral.net/id/eprint/1009

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