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Issue 31, 2016
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Template-free fabrication of nitrogen-doped hollow carbon spheres for high-performance supercapacitors based on a scalable homopolymer vesicle

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Abstract

Presented in this article is the template-free fabrication of nitrogen-doped hollow carbon spheres (N-HCSs) as electrode materials for high-performance supercapacitors based on scalable homopolymer vesicles, which are self-assembled from an amphiphilic homopolymer, poly(amic acid) (PAA). This homopolymer can be massively produced by simple stepwise polymerization at room temperature with a fast polymerization rate. For the first time, PAA homopolymer vesicles are carbonized to form N-HCSs with tunable porous structures and nitrogen contents (from 1.3% to 7.4%) by controlling the content of the cross-linker (melamine). This template-free method for fabricating N-HCSs is more environmentally friendly and does not involve tedious synthetic procedures compared to traditional template-based methods. More importantly, the N-HCSs exhibit excellent electrochemical performance with a very high specific capacitance (266.9 F gāˆ’1) after more than 1000 cycles when used as the active electrode material for the supercapacitor. The N-HCSs presented in this paper retain its specific capacitance as high as 84% at a very high current density (20 A gāˆ’1). Given the potential massive production and excellent electrochemical properties, the N-HCSs based on the carbonization of scalable PAA homopolymer vesicles are promising candidate electrode materials for energy storage devices.

Graphical abstract: Template-free fabrication of nitrogen-doped hollow carbon spheres for high-performance supercapacitors based on a scalable homopolymer vesicle

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Publication details

The article was received on 25 May 2016, accepted on 28 Jun 2016 and first published on 29 Jun 2016


Article type: Paper
DOI: 10.1039/C6TA04330E
Citation: J. Mater. Chem. A, 2016,4, 12088-12097
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    Template-free fabrication of nitrogen-doped hollow carbon spheres for high-performance supercapacitors based on a scalable homopolymer vesicle

    H. Sun, Y. Zhu, B. Yang, Y. Wang, Y. Wu and J. Du, J. Mater. Chem. A, 2016, 4, 12088
    DOI: 10.1039/C6TA04330E

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