Unlocking the Potential of Oxygen-Deficient Copper-Doped Co3O4 Nanocrystals Confined in Carbon as an Advanced Electrode for Flexible Solid-State Supercapacitors

By Shude Liu, Ling Kang, Jisong Hu, Eui-Dam Jung, Jian Zhang, Seong Chan Jun, Yusuke Yamauchi. ACS Energy Letters, 2021

219 citations recorded by the source corpus.

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.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/c3ef1628dd0dd20d6bbef1024949dcafdd48d07a