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2017 (English)In: RSC Advances, E-ISSN 2046-2069, Vol. 7, p. 45968-45977Article in journal (Refereed) Published
Abstract [en]
Herein, we demonstrate a unique supercapacitor composite electrode material that is originated from a sustainable cellulosic precursor via simultaneous one-step carbonization/reduction of cellulose/ graphene oxide mats at 800 C. The resulting freestanding material consists of mechanically stable carbon nanofibrous (CNF, fiber diameter 50–500 nm) scaffolds tightly intertwined with highly conductive reduced graphene oxide (rGO) sheets with a thickness of 1–3 nm. The material is mesoporous and has electrical conductivity of 49 S cm 1, attributed to the well-interconnected graphene layers. The electrochemical evaluation of the CNF/graphene composite electrodes in a supercapacitor device shows very promising volumetric values of capacitance, energy and power density (up to 46 F cm 3, 1.46 W h L 1 and 1.09 kW L 1, respectively). Moreover, the composite electrodes retain an impressive 97% of the initial capacitance over 4000 cycles. With these superior properties, the produced composite electrodes should be the “looked-for” components in compact supercapacitors used for increasingly popular portable electronics and hybrid vehicles.
Place, publisher, year, edition, pages
Royal Society of Chemistry, 2017
Keywords
super capacitors, cellulose derived, carbon nanofibre, graphene
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
urn:nbn:se:kau:diva-64426 (URN)10.1039/c7ra07533b (DOI)000412211300010 ()
Funder
Knut and Alice Wallenberg Foundation, 644378
2017-10-022017-10-022022-09-15Bibliographically approved