Dynamic electrochemical properties of extremely stretchable electrochemical capacitor using reduced graphene oxide/single-wall carbon nanotubes composite

Authors

Byung Chul Kim, University of WollongongFollow
Hyeon Taek Jeong, University of WollongongFollow
Michael J. Higgins, University of WollongongFollow
Kook Hyun Yu, Dongguk University
Gordon G. Wallace, University of WollongongFollow

RIS ID

103354

Publication Details

Kim, B. Chul., Jeong, H. Taek., Higgins, M. J., Yu, K. Hyun. & Wallace, G. G. (2015). Dynamic electrochemical properties of extremely stretchable electrochemical capacitor using reduced graphene oxide/single-wall carbon nanotubes composite. Journal of the Electrochemical Society, 162 (12), A2351-A2355.

Abstract

Stretchable reduced graphene oxide (rGO)/single-wall carbon nanotubes (SWNTs) composite electrodes were prepared using a spray coating technique onto gold-coated latex substrates. Poly(vinyl alcohol) (PVA)/phosphoric acid (H3PO4) was used as a stretchable electrolyte in order to assemble a symmetrical electrochemical capacitor (EC). Cyclic voltammetry (CV) indicated a typical double layer capacitance, even after a number of stretching cycles. Electrochemical impedance spectroscopy (EIS) showed a well-defined capacitive responsewith lowinternal resistance after repetitive stretching to 100% strain.Galvanostatic charge/discharge measurements with up to 100 stretch cycles yielded symmetrical charge/discharge curves indicating reversibility and facile kinetics. The highest capacitance of an unstrained latex EC was 61 F g^-1 (15.3 mF cm^-2), which decreased to 49 F g^-1 (12.3 mF cm^-2) and 42 F g^-1 (10.5 mF cm^-2) after 50 and 100 stretching cycles, respectively. The stretchable EC subjected to 100 stretching cycles retained approximately 67% of its initial capacitance value after 3,000 charge/discharge cycles.

Grant Number

ARC/CE0561616

Additional Grant Number

http://purl.org/au-research/grants/arc/CE0561616