4.6 Article

Electrochemical Performance of MnO2/Graphene Flower-like Microspheres Prepared by Thermally-Exfoliated Graphite

Journal

FRONTIERS IN CHEMISTRY
Volume 10, Issue -, Pages -

Publisher

FRONTIERS MEDIA SA
DOI: 10.3389/fchem.2022.870541

Keywords

MnO2; thermally-exfoliated graphite; supercapacitors; electrochemical performance; flower-like microspheres

Funding

  1. Department of Education of Liaoning Province, Liaoning Distinguished Professor Fund [512003,007021]
  2. Department of Science and Technology of Liaoning Province, Liaoning province unveils science and technology project [2021JH1/10400101]
  3. General project of national Natural Science Foundation of China [21777021]
  4. Liaoning Provincial Department of Education Youth Seedling Project [LQ2020010]
  5. PhD Start-up Research Foundation of Department of Science and Technology of Liaoning Province [2021-BS-184]

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In this study, MnO2/G composite with excellent electrochemical performance was successfully synthesized by optimizing the reaction conditions. The material shows great application potential in the field of supercapacitors.
To enhance the electrochemical performance of MnO2/graphene composite, herein, thermally-exfoliated graphite (TE-G) is adopted as a raw material, and a hydrothermal reaction is conducted to achieve the exfoliation of TE-G and the loading of MnO2 nanosheets. Through optimizing the TE-G/KMnO4 ratio in the redox reaction between carbon and KMnO4, flower-like MnO2/G microspheres (MnO2/G-10) are obtained with 83.2% MnO2 and 16.8% residual graphene. Meanwhile, corresponding MnO2/rGO composites are prepared by using rGO as raw materials. Serving as a working electrode in a three-electrode system, MnO2/G-10 composite displays a specific capacitance of 500 F g(-1) at 1 A g(-1), outstanding rate performance, and capacitance retention of 85.3% for 5,000 cycles. The performance is much better than that of optimized MnO2/rGO composite. We ascribe this to the high carbon fraction in TE-G resulting in a high fraction of MnO2 in composite, and the oxygen-containing groups in rGO reduce the resulting MnO2 fraction in the composite. The superior electrochemical performance of MnO2/G-10 is dependent on the hierarchical porous structure constructed by MnO2 nanosheet arrays and the residual graphene layer in the composite. In addition, a supercapacitor assembled by TE-G negative electrode and MnO2/G positive electrode also exhibits superior performance. In consideration of the low cost of raw materials, the MnO2/G composite exhibits great application potential in the field of supercapacitors.

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