Low-cost, solution processable carbon nanotube supercapacitors and their characterization
We report ecological and low-cost carbon nanotube (CNT) supercapacitors fabricated using a simple, scalable solution processing method, where the use of a highly porous and electrically conductive active material eliminates the need for a current collector. Electrodes were fabricated on a poly(ethylene terephthalate) substrate from a printable multi-wall CNT ink, where the CNTs are solubilized in water using xylan as a dispersion agent. The dispersion method facilitates a very high concentration of CNTs in the ink. Supercapacitors were assembled using a paper separator and an aqueous NaCl electrolyte and the devices were characterized with a galvanostatic discharge method defined by an industrial standard. The capacitance of the 2 cm2 devices was 6 mF/cm2 (2.3 F/g) and equivalent series resistance 80Ω. Low-cost supercapacitors fabricated from safe and environmentally friendly materials have potential applications as energy storage devices in ubiquitous and autonomous intelligence as well as in disposable low-end products.
Applied Physics A
Lehtimaki, Suvi; Tuukkanen, Sampo; Porhonen, Juho; Moilanen, Pasi; Virtanen, Jorma; Honkanen, Mari; and Lupo, Donald, "Low-cost, solution processable carbon nanotube supercapacitors and their characterization" (2014). Polymer Engineering Faculty Research. 2300.