Comparative study of optical kinetics in single and dual poly3-methylthiophene-based solid electrochromic devices
Por:
Leon-Silva, U, Nicho, ME, Hu, H
Publicada:
1 ene 2008
Resumen:
An electrochemically deposited poly3-methylthiophene (P3MT) thin film has been used as the primary electrochromic element in a solid two-electrode electrochromic device (ECD) with a viscous polymeric electrolyte (PE) of polymethyl methacrylate and lithium perchlorate co-dissolved in ethylene and propylene carbonates. The counter-electrode of the ECD was a transparent conductive (indium-tin oxide, ITO) glass (single ECD) or a polyaniline (PANI)-coated ITO glass (dual ECD). Dual P3MT-PANI-based ECDs exhibit a lower optical switch potential (less than 0.5 V) and a faster color change speed (around 1 s) compared with the single devices, independent on the lithium salt concentration and the viscosity of the polymeric electrolyte. Electrochemical impedance spectra of both types of ECDs were analyzed at zero bias. It indicates that the use of the secondary electroactive element leads to a lower counterion diffusion resistance as well as to a larger counter-ion storage capacity in the electroc
Filiaciones:
Univ Autonoma Estado Morelos, Ctr Invest Ingn & Ciencias Aplicadas, Cuernavaca 62210, Morelos, Mexico
Univ Nacl Autonoma Mexico, Ctr Invest Energia, Dept Mat Solares, Temixco 62580, Morelos, Mexico
|