Loading…

Facile fabrication of carbon nanosheets with hierarchically porous structure for high-performance supercapacitor

Carbon nanosheets have been considered as promising candidates for supercapacitors. However, it is still challenging to construct carbon nanosheets incorporating nanoscale thickness and controllable hierarchically porous structure. Herein, a type of novel carbon nanosheets with well-developed hierar...

Full description

Saved in:
Bibliographic Details
Published in:Microporous and mesoporous materials 2020-10, Vol.306, p.110440, Article 110440
Main Authors: Li, Zhaopeng, Cheng, Ao, Zhong, Weihao, Ma, Hong, Si, Mingzhi, Ye, Xiaoji, Li, Zhenghui, Zhang, Haiyan
Format: Article
Language:English
Subjects:
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Carbon nanosheets have been considered as promising candidates for supercapacitors. However, it is still challenging to construct carbon nanosheets incorporating nanoscale thickness and controllable hierarchically porous structure. Herein, a type of novel carbon nanosheets with well-developed hierarchical micro-/meso-/macropores are synthesized by combining bubbling and templating methods, in which an organic-metal salt (ferrous gluconate) with low melting point is used as carbon source. The prepared carbon nanosheets have exceptional structural controllability, that is, the sheet thickness can be well tailored from 142 to 53 nm, and the embedded pores are adjustable in the range of 20 nm–168 nm. Meanwhile, owing to robust carbon skeleton to tolerate the KOH etching, the surface area of carbon nanosheets can be raised to 3230 m2 g−1 after an activation process. Based on these unique structural merits, the carbon nanosheets exhibit attractive supercapacitive performance. The specific capacitance can reach 235 F g−1 at 0.1 A g−1, and even at a very large current density of 50 A g−1, a high capacitance of 168 F g−1 is still retained, indicating good retention of 71%. [Display omitted] •HCNs are synthesized by bubbling−templating combination method.•HCNs have controllable nanoscale thickness and hierarchically porous structure.•HCNs exhibit superior supercapacitive performance, especially high-rate capability.
ISSN:1387-1811
1873-3093
DOI:10.1016/j.micromeso.2020.110440