Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 117, Issue 3, Pages 1329-1334Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-014-8547-4
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Funding
- Academy of Finland [138146, 139881]
- Finnish Funding Agency for Technology and Innovation (TEKES) [40049/12]
- Tekniikan edistamissaatio
- Academy of Finland (AKA) [139881, 138146, 139881, 138146] Funding Source: Academy of Finland (AKA)
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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 cm(2) devices was 6 mF/cm(2) (2.3 F/g) and equivalent series resistance 80 Omega. 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.
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