Publication Details

Lu, W., Fadeev, A., Qi, B., Smela, E., Matles, B. R., Ding, J., Spinks, G. Maxwell., Mazurkiewicz, J. H., Zhou, D., Wallace, G. G., MacFarlane, D., Forsyth, S. & Forsyth, M. (2002). Use of ionic liquids for pi-conjugated polymer electochemical devices. Science, 297 983-987.


Pi-Conjugated polymers that are electrochemically cycled in ionic liquids have enhanced lifetimes without failure (up to 1 million cycles) and fast cycle switching speeds (100 ms). We report results for electrochemical mechanical actuators, electrochromic windows, and numeric displays made from three types of -conjugated polymers: polyaniline, polypyrrole, and polythiophene. Experiments were performed under ambient conditions, yet the polymers showed negligible loss in electroactivity. These performance advantages were obtained by using environmentally stable, room-temperature ionic liquids composed of 1-butyl-3-methyl imidazolium cations together with anions such as tetrafluoroborate or hexafluorophosphate.

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