In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 10, No. 4 ( 2022), p. 2027-2034
Abstract:
Interconnected porous carbons show great potential for high-rate capacitive energy storage, especially at high electrode mass loadings, due to their continuous conductive network and ion migration channels. Herein, we show a simple construction of 3D interconnected porous carbon through spontaneous merging of nano-sized ZIF-8 polyhedrons ( ca. 76 nm) during the pyrolysis process. The obtained porous carbon shows a continuous conductive network, interconnected micro-/meso-porous structure, abundant N and O heteroatoms, and good hydrophilicity, enabling fast electron and ion transport kinetics for thick electrodes. As a result of the above merits, the as-obtained carbon shows high capacitance (320.7 F g −1 at 1 A g −1 ) and outstanding rate performance (213.9 F g −1 at 100 A g −1 ). Importantly, even at a high mass loading of 15 mg cm −2 , the as-prepared material exhibits an outstanding rate performance of 137.7 F g −1 at 100 A g −1 . Furthermore, the assembled symmetric supercapacitor using 1 mol L −1 Na 2 SO 4 electrolyte shows a high energy density of 20.6 W h kg −1 at 0.5 kW kg −1 and 7.6 W h kg −1 at 34.3 kW kg −1 , as well as good cycle stability. Our work indicates that building 3D interconnected structure by merging nanoparticles shows great potential for high-mass-loading energy storage.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
2702232-8
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