Environmentally friendly supercapacitors are fabricated using commercial grade aluminum coated paper as a substrate and symmetrical activated carbon electrodes as large area electrodes. Different choline chloride-based eutectic solvents are used as electrolyte. These are inexpensive, environmentally friendly and have a larger operating window compared to that of water electrolytes. As the entire device is printed and the materials used are inexpensive, both small- and large-area power sources can be fabricated to be used in cheap, disposable and recyclable devices. Supercapacitors with different eutectic solvents are measured using cyclic charge-discharge and impedance spectroscopy measurements and compared to one widely used and one "green" imidazolium ionic liquid; EMIM:TFSI and EcoEng 212™, respectively. A mixture of ethylene glycol and choline chloride, Glyceline™, show the highest capacitance and power densities of the electrolytes being tested, including the imidazolium alternatives.
- deep eutectic solvents
- activated carbons
- printed electronics
- environmentally friendly
Pettersson, F., Keskinen, J., Remonen, T., von Hertzen, L., Jansson, E., Tappura, K., Zhang, Y., Wilen, C-E., & Österbacka, R. (2014). Printed environmentally friendly supercapacitors with ionic liquid electrolytes on paper. Journal of Power Sources, 271, 298-304. https://doi.org/10.1016/j.jpowsour.2014.08.020