Complementary electrochromic devices of PANI and PEDOT using the enzymatic poly(gallic acid)

• Published in: Solar energy materials and solar cells Vol. 200; p. 109973
• Main Authors: Díaz-Sánchez, Jesús, Roquero, Pedro, Hernández-Alcántara, José M., Rosas-Aburto, Alberto, Vázquez-Torres, Humberto, Gimeno, Miquel
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15-09-2019; Elsevier BV
• Subjects: Coloring; Electrochromic cells; Electrochromism; Enzyme; Flexible electrochromic devices; Gallic acid; Infrared analysis; Infrared spectroscopy; Life span; Poly(gallic acid); Polyanilines; Polyanilline; Polyedot; Polymers; Spectroscopy; Spectrum analysis; Thermogravimetric analysis; Polyanilline; Flexible electrochromic devices; Enzyme; Polyedot; Poly(gallic acid)
• ISSN: 0927-0248; 1879-3398
• DOI: 10.1016/j.solmat.2019.109973

The semiconducting and non-toxic enzymatic polygallic acid (PGAL) produces water dispersible poly(3,4-ethylenedioxythiophene) (PEDOT-PGAL) and polyaniline (PANI-PGAL). The results indicate that PGAL is a template for the model polymers, and thereby, the complexes are processable by spray coating to produce flexible electrochromic devices (ECDs). The materials were characterized by infrared spectroscopy, thermogravimetric analysis, and conductivity measurements in pellet form. Additionally, potentiostatic and potentiodynamic techniques in combination with UV-spectroscopy assess these materials. The produced ECDs based on PEDOT-PGAL has a ΔT of up to 19% and a life span lower than 100 cycles. However, when the PEDOT-PGAL architecture is complementary with PANI-PGAL displays up to 1000 times with a ΔT of 15% and coloring efficiencies of 275 cm2/C. The color of this PGAL-based device changes from dark violet to light green which differs from the common complementary EDCs. Additionally, complementary ECD fabricated with PEDOT-PSS against PANI-PGAL enhances the coloring efficiency up to 517 cm2/C (ΔT = 26%) and cycled 1000 times.
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•Enzymatic PGAL allows the syntheses of water-dispersible PANI and PEDOT.•The color of this PGAL-based device changes from dark violet to light green.•PEDOT-PGAL vs PANI-PGAL displays up to 1000 cycles with high contrast and coloring efficiencies.•PEDOT-PSS vs PANI-PGAL enhances the coloring efficiency and also cycled 1000 times.•This ECD is environmentally friendly and less toxic.