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Vertically-aligned Co3O4 nanowires interconnected with Co(OH)2 nanosheets as supercapacitor electrode

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  • Mei, Junfeng
  • Fu, Wenbin
  • Zhang, Zemin
  • Jiang, Xiao
  • Bu, Han
  • Jiang, Changjun
  • Xie, Erqing
  • Han, Weihua

Abstract

Three-dimensional (3D) hierarchical nanostructure consisting of vertically-aligned Co3O4 nanowires and Co(OH)2 nanosheets have been successfully prepared by a two-step wet chemical method. In this structure, the Co3O4 nanowires were wrapped and interconnected with ultrathin Co(OH)2 nanosheets and combined into a whole network. The Co3O4/Co(OH)2 3D network nanostructure shows a high specific capacitance of 867 F/g at a current density of 2 A/g, and a satisfied cycling stability with 84.5% capacitance retention after 5000 cycles. An asymmetric supercapacitor with the Co3O4/Co(OH)2 and activated carbon was also assembled by using 2 M KOH as electrolyte. The supercapacitor shows a wide potential window of 0–1.5 V, and the energy density can reach 25.6 W h kg−1 at a power density of 939.03 W kg−1. Our work has proposed a new strategy to improve the electrode performance of electrochemical supercapacitors by rationally building three-dimensional nanomaterial network with nanowires and nanosheets.

Suggested Citation

  • Mei, Junfeng & Fu, Wenbin & Zhang, Zemin & Jiang, Xiao & Bu, Han & Jiang, Changjun & Xie, Erqing & Han, Weihua, 2017. "Vertically-aligned Co3O4 nanowires interconnected with Co(OH)2 nanosheets as supercapacitor electrode," Energy, Elsevier, vol. 139(C), pages 1153-1158.
    • Handle: RePEc:eee:energy:v:139:y:2017:i:c:p:1153-1158
    DOI: 10.1016/j.energy.2017.08.014
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    References listed on IDEAS

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    1. Nguyen, Tuyen & Boudard, Michel & João Carmezim, M. & Fátima Montemor, M., 2017. "NixCo1-x(OH)2 nanosheets on carbon nanofoam paper as high areal capacity electrodes for hybrid supercapacitors," Energy, Elsevier, vol. 126(C), pages 208-216.
    2. Xiang, Dong & Yin, Longwei & Wang, Chenxiang & Zhang, Luyuan, 2016. "High electrochemical performance of RuO2–Fe2O3 nanoparticles embedded ordered mesoporous carbon as a supercapacitor electrode material," Energy, Elsevier, vol. 106(C), pages 103-111.
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    5. Hong, Wei & Wang, Jinqing & Li, Zhangpeng & Yang, Shengrong, 2015. "Fabrication of Co3O4@Co–Ni sulfides core/shell nanowire arrays as binder-free electrode for electrochemical energy storage," Energy, Elsevier, vol. 93(P1), pages 435-441.
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    1. Wang, Y. & Qiao, X. & Zhang, C. & Zhou, Xiangyang, 2018. "Self-discharge of a hybrid supercapacitor with incorporated galvanic cell components," Energy, Elsevier, vol. 159(C), pages 1035-1045.
    2. Dhakal, Ganesh & Mohapatra, Debananda & Tamang, Tensangmu Lama & Lee, Moonyong & Lee, Yong Rok & Shim, Jae-Jin, 2021. "Redox-additive electrolyte–driven enhancement of the electrochemical energy storage performance of asymmetric Co3O4//carbon nano-onions supercapacitors," Energy, Elsevier, vol. 218(C).
    3. Ensafi, Ali A. & Ahmadi, Najmeh & Rezaei, Behzad & Abdolmaleki, Amir & Mahmoudian, Manzar, 2018. "A new quaternary nanohybrid composite electrode for a high-performance supercapacitor," Energy, Elsevier, vol. 164(C), pages 707-721.
    4. Zhang, Ziyun & Wang, Shilong & Chen, Xiaomin & Han, Sheng & Jiang, Jibo, 2024. "Built-in electric field and selenium vacancies synergistically enhance NiSe2@Co0.85Se high-performance supercapacitors," Energy, Elsevier, vol. 293(C).
    5. Kavyashree, & Parveen, Shama & Sharma, Suneel Kumar & Pandey, S.N., 2020. "Solid-state symmetric supercapacitor based on Y doped Sr(OH)2 using SILAR method," Energy, Elsevier, vol. 197(C).

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