Development and characterization of a flexible electrochromic device based on polyaniline and enzymatically synthesized poly (gallic acid)

- A novel electrochromic device has been produced using enzymatically synthesized polygallic acid component.
- Highly dispersed in water conducting polyaniline (PANI) complex has been successfully achieved.
- The conductive PANI-PGAL has remarkably high thermal resistance.
- The novel PANI-PGAL complex-based EDC showed electrochemical reversibility.

An effective polyaniline-based electrochromic device was successfully achieved using the enzyme-mediated poly (gallic acid) as a polyaniline polymerization template. Poly (gallic acid) proved non-toxic upon the conducted cytotoxicity assays. Thermogravimetric analysis of the novel polyaniline-poly (gallic acid) complex displayed a remarkable increase in thermal stability compared to polyaniline-HCl doped, polyaniline-poly (styrene sulfonate), polyaniline-poly (isobutylene-alt-maleic anhydride) complexes. Polyaniline-poly (gallic acid) water dispersion was readily processed by spray-coating on indium tin oxide-poly (ethylene terephthalate) sheet. These novel electrode was employed as an electroactive layer in flexible electrochromic device with propylene carbonate-poly (methyl methacrylate)-LiClO4 polymer electrolyte. The transmittance of the electrochromic device at 650 nm in a wide voltage range varied from 59% (−0.87 V) to 37.1% (+0.33 V) giving an optical contrast of 22% and a life up to 700 cycles.

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