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Nanoscale. 2019 Jun 21;11(23):11086-11092. doi: 10.1039/c9nr02476j. Epub 2019 Jun 4.

Two-dimensional hierarchically porous carbon nanosheets for flexible aqueous supercapacitors with high volumetric capacitance.

Author information

1
Shenzhen Key Laboratory of Special Functional Materials, Shenzhen Engineering Laboratory for Advanced Technology of Ceramics, Guangdong Research Center for Interfacial Engineering of Functional Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, P. R. China. lyao@szu.edu.cn.
2
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong 518060, P. R. China.
3
School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing, China.
4
Laboratory for Advanced Interfacial Materials and Devices, Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hong Kong SAR, China. tczzheng@polyu.edu.hk.

Abstract

Two-dimensional carbon nanomaterials can be assembled into a dense film and used for flexible supercapacitors, but the high packing density leads to restacking problems and poor volumetric capacitance. To address this challenge, we report two-dimensional hierarchically porous carbon (2D-HPC) consisting of micro-, meso-, and macro-pores on the 2D sheet, which shows superior capacitance and rate capability compared with a 2D carbon nanosheet consisting predominantly of micro-pores. A flexible supercapacitor fabricated with the 2D-HPC presents a high volumetric capacitance of 412 F cm-3, a high volumetric energy density of 9.2 mW h cm-3 and a power density of 120 mW cm-3.

PMID:
31162521
DOI:
10.1039/c9nr02476j

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