journal article·2021-09-10

Unlocking the Potential of Oxygen-Deficient Copper-Doped Co3O4 Nanocrystals 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

ACS Energy Letters· Volume 6· Issue 9
Publisher page

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.
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Research context

OpenAlex topics: Supercapacitor Materials and Fabrication · Advancements in Battery Materials · Advanced battery technologies research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Mechanical Engineering, Yonsei University, Seoul 120-749, South Korea

JST-ERATO Yamauchi Materials Space-Tectonics Project and International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan

Shanghai Key Laboratory of Multidimensional Information Processing, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China

School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China

School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia

JST-ERATO Yamauchi Materials Space-Tectonics Project, Kagami Memorial Research Institute for Materials Science and Technology, Waseda University, 2-8-26 Nishiwaseda, Shinjuku-ku, Tokyo 169-0051, Japan

Funding

NanoMaterial Technology Development Program · Australian National Fabrication Facility???s Queensland Node · JST-ERATO Yamauchi Materials Space-Tectonics Project · Korea government (MIST)

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