Poly(3,4-ethylenedioxypyrrole) and Composites for Electrochromic and Supercapacitor Applications

Reddy, B N and M, Deepa (2014) Poly(3,4-ethylenedioxypyrrole) and Composites for Electrochromic and Supercapacitor Applications. PhD thesis, Indian Institute of Technology Hyderabad.

Preview

Text
CY10P003_2014.pdf - Submitted Version
Download (15MB)

Abstract

In this thesis, poly(3,4-ethylenedioxypyrrole) or PEDOP and it‘s composites were synthesized wherein the polymer films were grown by electropolymerization and an appropriate moiety was integrated with the polymer to achieve enhanced electrochemical response for electrochromic and/or supercapacitor applications. Improvements in electrochromic and redox switching capability for PEDOP films were attained by use of reduced graphene oxide functionalized with an ionic liquid (RGO/IL) as a dopant/counter ion. Further, the variation in localized nanoscale conduction / work function profile of PEDOP, when doped with an intr1insically conducting charge balancing counter ion such as functionalized carbon nanotubes was compared with the nanoscale behavior of same polymer doped with insulating counter ions and correlated to the significantly increased electrochromic switching by using a combination of electrochemical tools and microscopy probes. Electrochromic devices usingPEDOP andpoly(5-cyano-indole) or PCIND as cathodic and anodic electrochromes with a novel ionic liquid based polymeric electrolyte were assembled, and the performance attributes of the device were examined in detail, to ultimately demonstrate the suitability of the PEDOP-PCIND device for smart window applications.Electrically conductive composites of Sb2S3 nanorods enwrapped by PEDOP were prepared and used as electrodes in asymmetric supercapacitors; structure-property correlation with an emphasis on the ability of Sb2S3 to serve as electron conduits was evaluated. A PEDOP-Au@WO3 hybrid dual function electrochromic supercapacitor electrode capable of optically modulating solar radiation while simultaneously storing/releasing charge was constructed for the first time and the concurrent electrochromic cum pseudocapacitive roles of this hybrid was established and assessed with respect to pristine PEDOP and WO3 films. The ability of PEDOP to enhance the photoelectrochromic response of a V2O5 nanobelts based film, using a PEDOP/V2O5 hybrid was shown. In this thesis, the remarkable potential of PEDOP and it‘s composites for high performance electrochromic devices, supercapacitors, electrochromic supercapacitors and as electrodes in self-powered photoelectrochromic devices is unambiguously demonstrated.

[error in script]

IITH Creators: