Aminal/Schiff-Base Polymer to Fabricate Nitrogen-Doped Porous Carbon Nanospheres for High-Performance Supercapacitors

Fei Li, Xinhua Huang, Nuoya Wang, Xingxing Zhu, Vincent Chan, Ruikun Zhao, Yimin Chao

Research output: Contribution to journalArticle

Abstract

In this study, a polymer-containing aminal and imine (C=N) linkages was synthesized from the reaction between p-phthalaldehyde and 2,6-diaminepyridine through nucleophilic addition. Subsequently, nitrogen-doped carbon nanospheres (N-CNSs) were fabricated by a process of sequential potassium hydroxide (KOH) activation and direct carbonization of the polymer. Interestingly, the mass ratio (x) of the polymer to KOH was found to play a crucial role in dictating the porosity, surface chemistry, and capacitive performance of the resulting CNSs. The optimization of x led to the formation of N-CNS-2 with a significantly larger specific surface area (809 m 2 g −1, 98 % microporous content) and a high specific capacitance (732 F g −1) at 8 A g −1 in 6 M KOH aqueous electrolyte. In addition, the electrode fabricated with N-CNS-2 showed excellent cycling stability along with 98 % of the initial specific capacitance after 5000 charge/discharge cycles. The carbon precursor with the aminal linkage network has shown very promising potential in energy storage materials.

Original languageEnglish
Pages (from-to)3859-3865
Number of pages7
JournalChemElectroChem
Volume7
Issue number18
Early online date15 Sep 2020
DOIs
Publication statusPublished - 15 Sep 2020

Keywords

  • activation
  • aminal bonding
  • nanosphere
  • porous carbon
  • supercapacitors

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