Electrochemical performance of symmetric supercapacitors under compression: Size effects of activated carbon spheres

Xinyu Cai, Yan Xiao, Wei Sun, Fuqian Yang

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The significant influences of the external stress in the electrochemical performances of the supercapacitors require the optimization of the electrode materials with reasonable morphology. In this work, activated carbon spheres (ACSs) of different sizes are prepared from hydrothermal processing of glucose aqueous solution, pre-carbonization, and KOH activation. The energy storage performance of ACS-based supercapacitors (SCs) under compression is analyzed. Increasing the compressive stress from 1 MPa to 8 MPa promotes the specific capacitance of the ACS-based SCs, which achieves 374 F/g at 0.5 A/g for the ACSs with the smallest diameter of 1.48 μm. Applying higher compressive stress also reduces IR drop and the self-discharge rate. The compression is found to have more significant positive effects on the electrochemical properties of the ACSs with larger sizes. The understanding of the morphological effect of the electrode materials on the electrochemical properties under compressive stress can help design and select appropriate electrode materials for supercapacitors applied under certain stresses.

Original languageEnglish
Pages (from-to)12871-12884
Number of pages14
JournalInternational Journal of Energy Research
Volume46
Issue number9
DOIs
StatePublished - Jul 2022

Bibliographical note

Publisher Copyright:
© 2022 John Wiley & Sons Ltd.

Keywords

  • activated carbon spheres
  • compressive stress
  • morphological effect
  • self-discharge
  • supercapacitor

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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