CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

Cellulose-derived carbon nanofibers/graphene composite electrodes for powerful compact supercapacitors

Volodymyr Kuzmenko (Institutionen för mikroteknologi och nanovetenskap, Elektronikmaterial och system ) ; Nan Wang (Institutionen för mikroteknologi och nanovetenskap, Elektronikmaterial och system ) ; Mohammad Mazharul Haque (Institutionen för mikroteknologi och nanovetenskap, Elektronikmaterial och system ) ; Olga Naboka ; M. Flygare ; K. Svensson ; Paul Gatenholm (Institutionen för kemi och kemiteknik, Polymerteknologi) ; Johan Liu (Institutionen för mikroteknologi och nanovetenskap, Elektronikmaterial och system ) ; Peter Enoksson (Institutionen för mikroteknologi och nanovetenskap, Elektronikmaterial och system )
Rsc Advances (2046-2069). Vol. 7 (2017), 73, p. 45968-45977.
[Artikel, refereegranskad vetenskaplig]

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 degrees 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.

Nyckelord: electrochemical energy-storage, paper-based supercapacitors, reduced, graphene oxide, flexible supercapacitors, enhanced performance, porous, structures, activated carbon, surface-area, carbonization, capacitance, Chemistry



Denna post skapades 2017-10-25.
CPL Pubid: 252769

 

Läs direkt!


Länk till annan sajt (kan kräva inloggning)