Volume 42 Issue 8
Aug.  2020
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HUANG Ying-ying, LI Geng-hui, ZHAO Bo, LU Jin-lin, KANG Shu-mei, CHEN Shu-wen. Preparation and energy storage properties of V2O5/MXene nanocomposites[J]. Chinese Journal of Engineering, 2020, 42(8): 1018-1028. DOI: 10.13374/j.issn2095-9389.2019.11.07.002
Citation: HUANG Ying-ying, LI Geng-hui, ZHAO Bo, LU Jin-lin, KANG Shu-mei, CHEN Shu-wen. Preparation and energy storage properties of V2O5/MXene nanocomposites[J]. Chinese Journal of Engineering, 2020, 42(8): 1018-1028. DOI: 10.13374/j.issn2095-9389.2019.11.07.002
shu

Preparation and energy storage properties of V2O5/MXene nanocomposites

  • School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, China

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  • Corresponding author:

    CHEN Shu-wen, E-mail: 783636211@qq.com

  • Received Date: November 06, 2019
  • Available Online: March 05, 2020
  • Published Date: September 10, 2020
    Graphical Abstract
    • Abstract
  • Supercapacitors are usually used in new energy storage devices, communication technology, military, and aerospace fields due to their long lifecycle and high power density. Presently, it is imperative to find the electrode materials with low cost and excellent capacity. MXenes have received increasing attention due to their unique physical and chemical properties. They not only have superior electrical conductivity but also contain abundant surface groups (−OH, −F or −O); therefore, they are regarded as versatile 2D materials. MXenes can generate higher volumetric capacitance than that of graphene. However, MXene nanosheets are inclined to stack together, limiting the electrochemical properties of supercapacitors. In this work, an MXene (Ti3C2Tx) was obtained by etching an MAX (Ti3AlC2) phase using HF. To expand the interlayer spacing of Ti3C2Tx, the liquid-phase intercalation method was adopted. After the interlayer spacing was expanded, V2O5 nanosheet (NSV) and V2O5 nanobelt (NBV) were loaded on the MXene surface by a facile hydrothermal process. Their structure and morphology were characterized using different techniques, such as X-ray diffraction, Brunauer–Emmett–Teller surface area measurements, and field-emission scanning electron microscopy. The results show that the interlayer spacing of MXene is increased after liquid-phase intercalation, and NSV and NBV are uniformly loaded on the MXene surface. Moreover, the specific surface areas of the NSV/MXene and NSV/MXene nanocomposites are higher than that of the MXene; therefore, the nanocomposites can provide more active sites for electrochemical reactions. The electrochemical performances of the nanocomposites were investigated in 1.0 mol·L−1 Na2SO4 and 1.0 mol·L−1 LiNO3 aqueous solutions. The specific capacitances of V2O5, MXene, NSV/MXene, and NBV/MXene are 8.1, 15.7, 96.8, and 88.5 F·g−1 in 1.0 mol·L−1 Na2SO4, respectively. When they are tested in 1.0 mol·L−1 LiNO3, their specific capacitances are 64.6, 46.7, 180.0, and 114.0 F·g−1, respectively. Therefore, the NSV/MXene nanocomposite is a potential electrode material for supercapacitors.
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