Gas expansion-assisted preparation of 3D porous carbon nanosheet for high-performance sodium ion hybrid capacitor

Litong Zhang, Jingwen Sun, Hongan Zhao, Yuntong Sun, Liming Dai, Fanglei Yao, Yongsheng Fu, Junwu Zhu

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Sodium ion hybrid capacitors (SIHCs) have attracted considerable attentions due to their high-energy density of batteries and high-power output of supercapacitors. However, the slow intercalation kinetics of anode and low specific capacity of cathode greatly hinder the high-performance output of the SIHCs. Herein, we develop a facile chemical gas expansion method with chemical etching to prepare 3D nitrogen and sulfur co-doped porous carbon nanosheet (PCNS). As an anode material of SIBs, the PCNS displays a high reversible capacity of 205 mAh g−1 at 0.5 A g−1, outstanding rate capability of 96 mAh g−1 at 20 A g−1, and excellent cycle performance of 180 mAh g−1 at 7 A g−1 after 10 000 cycles. Based on this good performance, a dual-carbon SIHC is assembled by battery-type anode material (PCNS) and capacitive-type cathode material (hierarchically porous carbon). This device exhibits high energy densities of 119 Wh kg−1 and 53 Wh kg−1 at power densities of 200 W kg−1 and 20 kW kg−1, respectively. Besides, it possesses a superior cycle life of 82% capacity retention after 8000 cycles. Moreover, this work provides a new idea for the synthesis of carbon materials as high-performance SIBs and SIHCs electrode materials.

Original languageEnglish
Article number228679
JournalJournal of Power Sources
Volume475
DOIs
StatePublished - 1 Nov 2020
Externally publishedYes

Keywords

  • Carbon nanosheet
  • Dual-carbon
  • Gas expansion
  • Hybrid capacitor
  • Sodium ion storage

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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