Research Article

Nano Research

, Volume 3, Issue 6, pp 452-458

Open Access This content is freely available online to anyone, anywhere at any time.

Aqueous supercapacitors on conductive cotton

  • Mauro PastaAffiliated withDipartimento di Chimica Inorganica, Metallorganica e Analitica “Lamberto Malatesta”, Università degli Studi di MilanoDepartment of Materials Science and Engineering, Stanford University
  • , Fabio La MantiaAffiliated withDepartment of Materials Science and Engineering, Stanford University
  • , Liangbing HuAffiliated withDepartment of Materials Science and Engineering, Stanford University
  • , Heather Dawn DeshazerAffiliated withDepartment of Materials Science and Engineering, Stanford University
  • , Yi CuiAffiliated withDepartment of Materials Science and Engineering, Stanford University Email author 

Abstract

Wearable electronics offer the combined advantages of both electronics and fabrics. In this article, we report the fabrication of wearable supercapacitors using cotton fabric as an essential component. Carbon nanotubes are conformally coated onto the cotton fibers, leading to a highly electrically conductive interconnecting network. The porous carbon nanotube coating functions as both active material and current collector in the supercapacitor. Aqueous lithium sulfate is used as the electrolyte in the devices, because it presents no safety concerns for human use. The supercapacitor shows high specific capacitance (˜70–80 F·g−1 at 0.1 A·g−1) and cycling stability (negligible decay after 35,000 cycles). The extremely simple design and fabrication process make it applicable for providing power in practical electronic devices.

Keywords

Supercapacitor wearable electronics energy storage carbon nanotubes