Int. J. of Nanomanufacturing   »   2016 Vol.12, No.3/4

 

 

Title: Porous N-doped carbon microfibres derived from cattail as high-performance electrodes for supercapacitors

 

Authors: Jingyuan Tao; Biao Gao; Xuming Zhang; Jijiang Fu; Changjian Peng; Kaifu Huo

 

Addresses:
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology, Wuhan 430074, China
Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology, Wuhan 430074, China

 

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.

 

Keywords: cattail seeds; carbon electrodes; porous carbon microfibres; supercapacitors; biomass; N-doped carbon microfibres; nitrogen doping; surface area; microstructure; current density; cycle stability; capacitance retention.

 

DOI: 10.1504/IJNM.2016.079220

 

Int. J. of Nanomanufacturing, 2016 Vol.12, No.3/4, pp.225 - 236

 

Submission date: 14 Jun 2015
Date of acceptance: 04 Jan 2016
Available online: 20 Sep 2016

 

 

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