Issue 29, 2016

Construction of nitrogen-doped porous carbon buildings using interconnected ultra-small carbon nanosheets for ultra-high rate supercapacitors

Abstract

Here, for the first time, we demonstrate a facile one-step construction of a nitrogen-doped porous carbon building (N-PCB) using interconnected ultra-small carbon nanosheets through the carbonization of biomass (Auricularia) using ZnCl2 as the activating agent and NH4Cl as the nitrogen source. Due to its high specific surface area (1607 m2 g−1) with a high mesopore ratio (91%), interconnected porous structure with short ion diffusion paths, and nitrogen doping (4.8 at%), the N-PCB electrode exhibits a high specific capacitance of 347 F g−1 at 1 A g−1, excellent rate capability (278 F g−1 at 50 A g−1, 80% of capacitance retention) and outstanding cycling stability (only 2% loss in specific capacitance after 10 000 cycles). Moreover, the assembled N-PCB symmetric supercapacitor is stabilized with excellence cycling stability (4% loss after 20 000 cycles) at 1.6 V in 1 M Na2SO4 aqueous electrolyte, delivering a high energy density of 22 W h kg−1, much higher than that of most of the reported carbon-based symmetric supercapacitors in aqueous electrolytes. Therefore, these exciting results suggest a low-cost and environmentally friendly design of electrode materials for high-performance supercapacitors.

Graphical abstract: Construction of nitrogen-doped porous carbon buildings using interconnected ultra-small carbon nanosheets for ultra-high rate supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
28 Mar 2016
Accepted
20 Jun 2016
First published
22 Jun 2016

J. Mater. Chem. A, 2016,4, 11388-11396

Construction of nitrogen-doped porous carbon buildings using interconnected ultra-small carbon nanosheets for ultra-high rate supercapacitors

L. Jiang, L. Sheng, X. Chen, T. Wei and Z. Fan, J. Mater. Chem. A, 2016, 4, 11388 DOI: 10.1039/C6TA02570F

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