Textile Based Electrochromic Cells Prepared with PEDOT: PSS and Gelled Electrolyte
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ID: 267607
2020
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Abstract
Electrochromic devices can act as passive displays. They change their color when a low voltage is applied. Flexible and bendable hybrid textile-film electrochromic devices with poly-3,4-ethylenedioxythiophene polystyrene sulfonate (PEDOT:PSS) were prepared on polyethylene polyethylene terephthalate (PEPES) membranes using a spray coating technique. The electrolyte consisted of a gelatin glycerol mixture as host matrix and calcium chloride. Titanium dioxide was used as an ion storage layer and a carbon containing dispersion was used for the counter electrode on a polyester rip-stop fabric. The sheet resistance of PEDOT:PSS on PEPES was 500 Ohm/sq. A 5 × 5 electrochromic matrix with individually addressable pixels was successfully designed and assembled. The switching time of the pixels was 2 s at a voltage of 2.0 V directly after assembling. The use of titanium dioxide as ion storage also increased the contrast of the dark-blue reduced electrochromic layer. Coloration was not self-sustaining. The PEDOT:PSS layer needed a constant low voltage of at least 0.5 V to sustain in the dark-blue reduced state. The switching time increased with time. After 12 months the switching time was ~4 s at a voltage of 2.8 V. The addition of glycerol into the electrolyte extended the lifetime of a non-encapsulated textile electrochromic cell, because moisture is retained in the electrolyte. Charge carriers can be transported into and out of the electrochromic layer.
| Reference Key |
graßmann2020sensorstextile
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|---|---|
| Authors | Carsten Graßmann;Maureen Mann;Lieva Van Langenhove;Anne Schwarz-Pfeiffer;Graßmann, Carsten;Mann, Maureen;Van Langenhove, Lieva;Schwarz-Pfeiffer, Anne; |
| Journal | sensors |
| Year | 2020 |
| DOI |
10.3390/s20195691
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| URL | |
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