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Ultrathin Carbon Nanosheets for Highly-efficient Capacitive K-ion and Zn-ion Storage

Abstract

Porous carbon has attracted extensive attentions as the electrode material for various energy storage devices considering its advantages like high theoretical capacitance/capacity, high conductivity, low cost and earth abundant inherence. However, there still exists limitations hindering its practical applications, such as the tedious fabrication process, limited metal-ion transport kinetics and undesired structure deformation at harsh electrochemical conditions. Herein, we report a facile strategy, with calcium gluconate as the carbon source, to fabricate ultrathin porous carbon nanosheets. The as-prepared Ca-900 electrode delivers excellent K-ion storage performance including high reversible capacity (413.7 mAh g-1), superior rate capability (161.8 mAh g-1 at an ultrahigh current density of 5.0 A g-1) and ultra-stable long-term cycling stability (a high capacity retention ratio of ~75.0% after 5500 cycles at 5.0 A g-1). Similarly, when being applied in Zn-ion hybrid capacitors, the Ca-900 electrode exhibits high energy desntiy of 75.22 Wh kg-1, illuminating the applicable potentials. Moreover, the origin of the fast and smooth metal-ion storage is also revealed by carefully designed consecutive CV measurements. Both K-ion/Zn-ion storage mechanisms are preliminarily revealed through ex situ measurements. Overall, considering the facile preparation strategy, unique structure, application flexibility and in-depth mechanism investigations, this work will deepen the fundamental understandings of potassium-ion batteries and serve as references for the development of porous carbon materials in other high-efficient energy storage devices.

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Supplementary files

Article information


Submitted
01 Sep 2020
Accepted
29 Sep 2020
First published
02 Oct 2020

J. Mater. Chem. A, 2020, Accepted Manuscript
Article type
Paper

Ultrathin Carbon Nanosheets for Highly-efficient Capacitive K-ion and Zn-ion Storage

Y. Zhang, Z. Wang, D. Li, Q. Sun, K. Lai, K. Li, Q. Yuan, X. Liu and L. Ci, J. Mater. Chem. A, 2020, Accepted Manuscript , DOI: 10.1039/D0TA08577D

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