期刊
CHEMSUSCHEM
卷 3, 期 1, 页码 97-105出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.200900202
关键词
doping; electrochemistry; electrochromism; redox chemistry; zwitterions
资金
- NPL
- University Grants Commission (UGC)
An electrochromic zwitterionic viologen, N,N'-bis(3-sulfonato-propyl)-4-4'-bipyridinium, has been use for the first time for doping poly (3,4-ethylenedioxythiopene) (PEDOT) films during electropolymerization. Slow and fast diffusional rates for the monomer at deposition potentials of +1.2 and +1.8 V, respectively yielded the viologen-doped PEDOT films with granular morphology and with dendrite-like shapes. The dual electrochrome formed at +1.8V, showed enhanced coloration efficiency, larger electrochemical charge storage-capacity, and superior redox activity in comparison to its analogue grown at +1.2 V, thus demonstrating the role of dendritic shapes in amplifying electrochromism. Flexible electrochromic devices fabricated with the. viologen-doped PEDOT film grown at +1.8 V and Prussian blue with an ionic liquid-based gel electrolyte film showed reversible coloration between pale and dark purple with maximum coloration efficiency of 187 cm(2) C-1 at lambda = 693 nm. The diffusional impedance parameters and switching kinetics of the device showed the suitability of this dual electrochrome formed as a single layer for practical electrochromic cells.
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