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Large scale production of polyacrylonitrile-based porous carbon nanospheres for asymmetric supercapacitors

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Abstract

The increasing demand for a satisfactory combination of energy–power features in supercapacitors has triggered considerable research efforts dedicated to the development of high-efficiency energy storage devices. In our study, highly cross-linked porous carbon microspheres were prepared via the carbonization of as-prepared polymer spheres followed by a KOH activation process. The resultant products exhibited a high maximum specific surface area (3065.6 m2 g−1), rich nitrogen and oxygen doping (22.3 wt%) and a significant volume fraction of mesopores/macropores (37.91%). The optimal electrode presents the highest specific capacitance of 290 F g−1 and superior cycling stability with 96% retention after 3000 cycles in an aqueous 2 M KOH electrolyte. Moreover, the assembled asymmetric supercapacitor device based on Co0.9Mn0.1 arrays as the positive electrode achieves a specific capacitance of 105.43 F g−1 and an energy density of 134.9 W h kg−1 at a power density of 2879.8 W kg−1. Interestingly, the device can illuminate an LED for 30 min, demonstrating the promising application potential in high-performance devices related to energy storage.

Graphical abstract: Large scale production of polyacrylonitrile-based porous carbon nanospheres for asymmetric supercapacitors

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Publication details

The article was received on 03 Feb 2018, accepted on 20 Mar 2018 and first published on 22 Mar 2018


Article type: Paper
DOI: 10.1039/C8TA01155A
Citation: J. Mater. Chem. A, 2018, Advance Article
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    Large scale production of polyacrylonitrile-based porous carbon nanospheres for asymmetric supercapacitors

    Y. Liu, J. Cao, X. Jiang, Y. Yang, L. Yu and X. Yan, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C8TA01155A

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