Electrospun nanofibers composed of poly(vinylidene fluoride-co-hexafluoropropylene) and poly(oxyethylene)-imide imidazolium tetrafluoroborate as electrolytes for solid-state electrochromic devices
Journal
Solar Energy Materials and Solar Cells
Journal Volume
177
Pages
32-43
Date Issued
2018
Author(s)
Yu, H.-F.
Kao, S.-Y.
Lu, H.-C.
Lin, Y.-F.
Feng, H.
Pang, H.-W.
Vittal, R.
Lin, J.-J.
Abstract
In this work, a novel electrochromic device (ECD), consisting of phenyl viologen (PV) as the cathodically coloring material and 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) as the stable radical provider for charge balance, was proposed. Nanofibers (NFs) obtained by electrospinning, using poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) and poly(oxyethylene)-imide imidazolium tetrafluoroborate (POEI-IBF4), were introduced into the electrolyte to absorb tetrabutylammonium tetrafluoroborate and propylene carbonate, so as to form a solid-state electrolyte for the ECD. The NFs were characterized by distribution of their diameters, or histograms, based on the scanning electron microscope (SEM) images; their physical properties, including electrolyte uptake, ionic conductivity, and porosity were studied. The proposed ECDs were characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), UV–visible spectra, and dynamic transmittance curves. The pertinent N15P10-ECD exhibited a high transmittance change (ΔT) of 68.7% at 590 nm, while maintaining a good cycling stability (95.5% of its original ΔT) after continuous 1000 switching cycles of operation at room temperature.
SDGs
Type
journal article