Improved performance and stability of solid state electrochromic devices with eco-friendly chitosan-based electrolytes

• Published in: Solid state ionics Vol. 334; pp. 152 - 159
• Main Author: Eren, Esin
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-06-2019; Elsevier BV
• Subjects: Addition polymerization; Bleaching; Casting; Charge transfer; Chitosan; Electrical equipment; Electrochromic cells; Electrochromic device; Electrochromism; Electrolytes; PEDOT; PEDOT:PSS; PMeT; Polymers; Polystyrene resins; Solid state physics; PMeT; PEDOT; Chitosan; Electrochromic device; PEDOT:PSS
• ISSN: 0167-2738; 1872-7689
• DOI: 10.1016/j.ssi.2019.02.013

Development of chitosan (Ch)-based green solid polymer electrolyte was attained with addition of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) using solvent casting method for electrochromic device. In the electrochromic device configuration, poly(3,4-ethylenedioxythiophene) (PEDOT), poly(3-methylthiophene) (PMeT) were used as counter polymer electrodes. The effect of chitosan/PEDOT:PSS-based electrolyte on PEDOT/PMeT-based electrochromic devices was evaluated. In order to deeply compare all electrochromic devices, electrochemical, transmittance, electrochemical impedance measurements were used. PEDOT:PSS can assist both electronic and ionic conduction leading to reduced charge transfer resistance and better electrochromic performance. Presented electrochromic device with use of PEDOT:PSS displayed higher optical modulation (20.6%/±1 V; 32.2%/±2 V at 650 nm, faster response times (coloration time (tc): 0.1 s/±1 V, 0.24 s/±2 V and bleaching time (tb): 0.11 s/±1 V, 0.52 s/±2 V)). These results signify that the addition of PEDOT:PSS to electrolyte is useful for improved electrochromic characteristics as the electrolyte for the fabrication of electrochromic device.
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•Eco-friendly solid polymer electrolyte including chitosan, PEDOT:PSS.•The influence of PEDOT:PSS on performance of PEDOT/PMeT-based ECD was evaluated.•PEDOT:PSS as conductive binder leads to reduce charge transfer resistance.•PEDOT:PSS-based ECD showed a superior optical modulation with fast switching times.•The use of PEDOT:PSS in electrolyte can develop next generation of smart window.