Controllable adjustment of oxygen contents in activated carbons and oxygen effect on electrochemical performances in supercapacitors

Yan Xiao, Xinyu Cai, Wei Sun, Fuqian Yang

Research output: Contribution to journalArticlepeer-review

Abstract

In this work, oxygen-doped activated carbons (ACs) are derived from glucose by hydrothermal synthesis (HTS) and a two-step consecutive activation/treatment. The first KOH activation leads to the formation of well-developed hierarchical porous structure. The second H2O-steam treatment controls the fraction of oxygen contents ranging from 3.35 to 10.43 at% by regulating the treatment time and temperature. We propose a reaction for the oxygen reduction during the H2O-steam treatment, of which the resultant reaction rate increases with the increase of the treatment temperature. The nominal activation energy for the reaction is 18.79 kJ/mol. The symmetric supercapacitors with the ACs of the highest oxygen content exhibit the best electrochemical performances of an optimum specific capacitance of 240.49 F/g in the electrolyte of 1 M H2SO4. However, the symmetric supercapacitors with the ACs of the lowest oxygen content exhibit the best electrochemical performances of an optimum specific capacitance of 171.81 F/g in the organic electrolyte of 1 M Et4BF4 in AN.

Original languageEnglish
Pages (from-to)12274-12289
Number of pages16
JournalInternational Journal of Energy Research
Volume46
Issue number9
DOIs
StatePublished - Jul 2022

Bibliographical note

Funding Information:
Liaoning Revitalization Talents Program, Grant/Award Number: XLYC1907067; National Natural Science Foundation of China, Grant/Award Number: 21805123; Talent scientific research fund of LSHU, Grant/Award Number: 2016XJJ‐077 Funding information

Funding Information:
WS is grateful for the support from the National Natural Science Foundation of China (No. 21805123), the LiaoNing Revitalization Talents Program (XLYC1907067) and talent scientific research fund of LSHU (No.2016XJJ‐077).

Publisher Copyright:
© 2022 John Wiley & Sons Ltd.

Keywords

  • activated carbons
  • electrochemical property
  • oxygen doping
  • supercapacitors
  • two-step activation

ASJC Scopus subject areas

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

Fingerprint

Dive into the research topics of 'Controllable adjustment of oxygen contents in activated carbons and oxygen effect on electrochemical performances in supercapacitors'. Together they form a unique fingerprint.

Cite this