Significantly improved conductivity of spinel Co<sub>3</sub>O<sub>4</sub>porous nanowires partially substituted by Sn in tetrahedral sites for high-performance quasi-solid-state supercapacitors

Porous spinel-structured Co3O4nanowires partially substituted by Sn in tetrahedral sites (CSO) were grown on a multi-layered graphene film (CSO@GF) with a high specific surface area (SSA) through a simple and low-cost hydrothermal method, followed by a thermal annealing process. The as-synthesized binder-free CSO@GF electrode exhibited high specific capacitance (2032.6 F g−1at 1 A g−1), superior rate capability (approximately 55.1% capacitance retention even at a current density of up to 40 A g−1), and remarkable cycling stability (94.3% capacitance retention after 10 000 cycles) due to significantly improved conductivity, which was further verified by density functional (DFT) calculations. A quasi-solid-state asymmetric supercapacitor (ASC) composed of the prepared CSO@GF and Fe2O3@GF as the positive and negative electrodes, respectively, was fabricated using a PVA-KOH gel electrolyte. The as-assembled supercapacitor delivered a prominent specific capacitance of 200.2 F g−1, an outstanding energy density of 62.6 W h kg−1at a power density of 751.2 W kg−1, and an excellent cycling stability with 91.69% capacity retention after 10 000 cycles, suggesting great potential for CSO@GF in high energy density storage devices.

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Work Title Significantly improved conductivity of spinel Co<sub>3</sub>O<sub>4</sub>porous nanowires partially substituted by Sn in tetrahedral sites for high-performance quasi-solid-state supercapacitors
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Open Access
Creators
  1. Yunjian Chen
  2. Jia Zhu
  3. Ni Wang
  4. Huanyu Cheng
  5. Xianzhong Tang
  6. Sridhar Komarneni
  7. Wencheng Hu
License In Copyright (Rights Reserved)
Work Type Article
Publisher
  1. Journal of Materials Chemistry A
Publication Date March 21, 2021
Publisher Identifier (DOI)
  1. https://doi.org/10.1039/d0ta12095b
Deposited November 15, 2021

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  • Created
  • Added supercapacitors-JMCA.pdf
  • Added Creator Yunjian Chen
  • Added Creator Jia Zhu
  • Added Creator Ni Wang
  • Added Creator Huanyu Cheng
  • Added Creator Xianzhong Tang
  • Added Creator Sridhar Komarneni
  • Added Creator Wencheng Hu
  • Published
  • Updated
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