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Synergistic design of N, O codoped honeycomb carbon electrode and ionogel electrolyte enabling all-solid-state supercapacitor with an ultrahigh energy density

Abstract

Significantly boosting the energy densities of supercapacitors without compromising their power densities is of paramount importance for practical application, but still faces great challenge. Herein, we report an ultrahigh-energy-density solid-state supercapacitor enabled by synergistical design of N, O codoped honeycomb porous carbon (HPC) electrode and ionogel electrolyte. HPC is synthesized through the co-assembly of melamine/formaldehyde with silica spheres, and shows an ultrahigh surface area (2379 m2 g‒1) coupled with 3D interconnected macro-, meso- and microporous structure, and high-level redox-active N/O dopants (6.90 and 10.17 wt.%). Benefiting from such merits, HPC electrode yields an extremely high capacitance of 533 F g‒1 at 0.5 A g‒1 in alkaline electrolyte, together with a superior cycle stability of 92.1% capacitance retention after 20000 cycles at 5 A g‒1. HPC assembled supercapacitors deliver energy outputs of 12.8 and 26.6 Wh kg−1 using KOH and Na2SO4 electrolytes, respectively. More attractively, HPC-fabricated all-solid-state symmetric device based on the use of a well-designed, polymer-gel supported ionic liquid electrolyte achieves an ultrahigh energy density of 94.1 Wh kg‒1, which is the highest value among the previously reported supercapacitors of the same type, and an excellent cycle stability (91.5% retention over 10000 cycles). This study highlights promising prospects to develop solid-state energy storage systems of high energy-power supply.

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Publication details

The article was received on 29 Oct 2018, accepted on 06 Dec 2018 and first published on 06 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA10406A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Synergistic design of N, O codoped honeycomb carbon electrode and ionogel electrolyte enabling all-solid-state supercapacitor with an ultrahigh energy density

    Z. Song, L. Li, D. Zhu, L. Miao, H. Duan, Z. Wang, W. Xiong, Y. Lv, M. Liu and L. Gan, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA10406A

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