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Porous quasi-graphitic carbon sheets for unprecedented sodium storage

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Abstract

The large size of sodium ions (Na+) restricts the choice of electrode materials; therefore, to realize low-cost energy storage systems, exceptional electrodes are required. Here, we have overcome this bottleneck by developing porous quasi-graphitic carbon (PGC) sheets at the surface of water-soluble KCl crystals as a green catalyst. The KCl crystals not only avoid the use of hazardous chemicals but also provide easy manipulation of the structural and surface chemistry of PGC sheets on a large-scale. The as-synthesized PGC sheets are enriched with micropores and amorphous reservoirs, which serve as mass transport channels and storage sites for Na+, respectively. Interestingly, when PGC sheets are employed as an anode in the sodium-ion battery, they showed an excellent reversible specific capacity of 237 mA h g−1 with outstanding cyclic stability by retaining 83.5% capacity after 250 cycles at 0.1 A g−1 at a capacity decay of 0.07% per cycle, while remaining stable up to 550 cycles when tested at 0.5 A g−1. Thus, the simple synthesis and large-scale production of PGC with high sodium storage capacity make it a potential candidate for secondary ion batteries.

Graphical abstract: Porous quasi-graphitic carbon sheets for unprecedented sodium storage

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Supplementary files

Article information


Submitted
17 Mar 2020
Accepted
12 May 2020
First published
18 May 2020

Inorg. Chem. Front., 2020, Advance Article
Article type
Research Article

Porous quasi-graphitic carbon sheets for unprecedented sodium storage

Y. Liu, S. Liu, Z. Liu, H. Tian, Z. Li, H. Su, Y. Li, N. Mahmood, X. Jian and H. Liu, Inorg. Chem. Front., 2020, Advance Article , DOI: 10.1039/D0QI00325E

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