Cycling and at-rest stabilities of a complementary electrochromic device containing poly(3,4-ethylenedioxythiophene) and Prussian blue |
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Authors: | Tsai-Shih Tung Kuo-Chuan Ho |
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Affiliation: | aDepartment of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan;bInstitute of Polymer Science and Engineering, National Taiwan University, Taipei 10617, Taiwan |
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Abstract: | PEDOT-based electrochromic devices (ECDs) have been investigated intensively in recent years. In order to obtain an ECD having long cycle life, the counter electrode and electrolyte used should be compatible in the electrochemical environment. Prussian blue (PB) is proven to be electrochemically stable when cycling in non-aqueous solutions. Thus a new organic-inorganic complementary ECD was assembled in combination with a PMMA-based gel polymer electrolyte. This ECD exhibited deep blue-violet when applying −2.1 V and became light blue when applying 0.6 V. Under these conditions, the transmittance of the ECD at 590 nm changed from 13.8% (−2.1 V) to 60.5% (+0.6 V) with a coloration efficiency of 338 cm2/C. The cell retained 55% of its maximum transmittance window (ΔTmax) after 50,640 repeated cycles. Moreover, the at-rest stability test revealed a transmittance window (ΔT) decay of 9.6% over a period of 107 days. Therefore, the proposed PEDOT-PB ECD may have potential for practical applications. |
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Keywords: | At-rest stability Coloration efficiency Cycling stability Electrochromic device Poly(3 4-ethylenedioxythiophene) Prussian blue |
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