Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 10: Functional materials I - Energy storage (organized by MM)

HL 10.1: Vortrag

Montag, 31. März 2014, 10:15–10:30, IFW A

Graphene-based supercapacitors for energy storage under extreme temperature conditions — •Ranjith Vellacheri, Ahmed Al-Haddad, Wenxin Wang, Huaping Zhao, Chengliang Wang, Zhijie Wang, and Yong Lei — Ilmenau University of Technology, Institute of Physics & IMN MacroNano (ZIK) 98693 Ilmenau (Germany)

Graphene-based supercapacitors have been fabricated for energy storage in a very wide range of temperatures. The optimized supercapacitors showed good charge storage capabilities from -24 °C to 50 °C. Specific capacitance of the electrode obtained from charge/discharge measurements was 91 F/g at room temperature (RT) and no considerable change when tested at different temperatures (e.g. 73 F/g and 100 F/g at -24 °C and 50 °C, respectively). Our samples also exhibited outstanding capacitance retention and cyclic stability at different operating temperatures. Extremely low equivalence series resistance (ESR) and charge transfer resistance were confirmed by electrochemical Impedance measurements. Especially, the low ESR could also result in high power density even at low operating temperatures. We believe that our results highlight the great prospective of the graphene-based supercapacitors for the efficient energy storage at extreme environments with a wide range of temperature difference