Unlocking the Potential of Oxygen-Deficient Copper-Doped Co3O4Nanocrystals Confined in Carbon as an Advanced Electrode for Flexible Solid-State Supercapacitors

Shude Liu, Ling Kang, Jisong Hu, Euigeol Jung, Jian Zhang, Seong Chan Jun, Yusuke Yamauchi

Research output: Contribution to journalArticlepeer-review

160 Citations (Scopus)

Abstract

Battery-type materials for supercapacitors have attracted increasing research interest owing to their high energy density. However, their poor electrode kinetics severely limit the utilization of redox-active sites on the electrode surface, resulting in subpar electrochemical performance. Herein, we incorporate both Cu dopants and O vacancies into Co3O4 nanocrystals confined in a carbon matrix (Ov-Cu-Co3O4@C) which are assembled into nanowires. This heterostructured architecture with multifunctional nanogeometries provides a high intercomponent synergy, enabling high accessibility to active species. Moreover, the Cu dopants and O vacancies in Ov-Cu-Co3O4@C synergistically manipulate the electronic states and provide more accessible active sites, resulting in enhanced electrical conductivity and enriched redox chemistry. The Ov-Cu-Co3O4@C achieves a significantly improved specific capacity and rate performance, exceeding those of Co3O4@C. The asymmetric supercapacitors with Ov-Cu-Co3O4@C deliver a high energy density of 64.1 W h kg-1 at 800 W kg-1, exhibiting good flexibility without significant performance degradation under different bending states.

Original languageEnglish
Pages (from-to)3011-3019
Number of pages9
JournalACS Energy Letters
Volume6
DOIs
Publication statusPublished - 2021

Bibliographical note

Publisher Copyright:
© 2021 American Chemical Society.

All Science Journal Classification (ASJC) codes

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

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