Issue 43, 2020

Ultrathin carbon nanosheets for highly efficient capacitive K-ion and Zn-ion storage

Abstract

Porous carbon has attracted extensive attention as an electrode material for various energy storage devices considering its advantages such as high theoretical capacitance/capacity, high conductivity, low cost and earth abundance. However, there still exist limitations hindering its practical applications, such as the tedious fabrication process, limited metal-ion transport kinetics and undesired structural deformation under 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 mA h g−1), superior rate capability (161.8 mA h 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 a high energy density of 75.22 W h kg−1, illustrating the application potential. 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 mechanistic investigations, it can be seen that this work will deepen the fundamental understanding of potassium-ion batteries and serve as a reference for the development of porous carbon materials for other highly efficient energy storage devices.

Graphical abstract: Ultrathin carbon nanosheets for highly efficient capacitive K-ion and Zn-ion storage

Supplementary files

Article information

Article type
Paper
Submitted
01 Sep 2020
Accepted
29 Sep 2020
First published
02 Oct 2020

J. Mater. Chem. A, 2020,8, 22874-22885

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, 8, 22874 DOI: 10.1039/D0TA08577D

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