Porous N-doped carbon microfibres derived from cattail as high-performance electrodes for supercapacitors
by Jingyuan Tao; Biao Gao; Xuming Zhang; Jijiang Fu; Changjian Peng; Kaifu Huo
International Journal of Nanomanufacturing (IJNM), Vol. 12, No. 3/4, 2016

Abstract: Nitrogen-doped carbon microfibres were produced by carbonisation of cattail seeds and subsequent KOH activation. The KOH activation process produces a large surface area of 2,486 m² g⁻¹. The carbon derived from cattail contains N heteroatom with a content of 1.6%. Benefiting from the large surface area and unique microstructure of the nitrogen-doped carbon microfibres material, these materials demonstrate superior capacitive properties with a large capacitance of 214 F g⁻¹ at the current density of 1 A g⁻¹ and excellent cycle stability. When current densities is increased to 10 and 90 folds from 1 A g⁻¹, capacitance retention is about 87 and 52%, implying excellent rate performance and high power densities. Based on the nitrogen-doped carbon microfibres, a symmetrical and aqueous supercapacitor device was also assembled, which show a considerable capacitance of 105 F g⁻¹ at the current density of 1 A g⁻¹ and perfect long ability. Such excellent performance is at least comparable to the best reports in the literature for two-electrode configuration under aqueous system. The facile method and excellent capacitive properties of nitrogen doped carbon fibres suggest promising applications as advanced supercapacitors.

Online publication date: Fri, 23-Sep-2016

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