4.6 Article

Rational fabrication of flower-like VS2-decorated Ti3C2 MXene heterojunction nanocomposites for supercapacitance performances

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ELSEVIER
DOI: 10.1016/j.colsurfa.2021.127381

Keywords

Vanadium disulfide; Ti3C2 (MXene); Nanocomposite electrodes; Asymmetric supercapacitor (ASC); DFT

Funding

  1. National Natural Science Foundation of China, (China) [52076126]
  2. Natural Science Foundation of Shanghai, (China) [18ZR1416200]
  3. Key Laboratory of Clean Power Generation and Environmental Protection Technology in Mechanical Industry

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The modification of two-dimensional Ti3C2 with VS2 to prepare VS2/Ti3C2 composites significantly improves the electrochemical performance of supercapacitors, enhancing specific capacity and cycling stability.
In this work, Ti3C2, was obtained by selective etching of Al in Ti3AlC2 by hydrofluoric and VS2 was modified on two-dimensional Ti3C2 by solvothermal process to prepare VS2/Ti3C2 composites. In the three-electrode system, the prepared VS2/Ti3C2 composites were compared with VS2 and Ti3C2, respectively, and it was found that the electrochemical properties of VS2/Ti3C2 composites were better. The intercalated VS2 nanosheets expanded the distance between Ti3C2 sheets, leading to a wide ion-accessible surface region and fast ionic/electric transport, resulting in the improved the electrochemical performance of the Ti3C2/VS2 composites. Density functional theory (DFT) analysis shows that the prepared VS2/Ti3C2 composite material has high electrical conductivity. Under the current density of 1 A.g(-1), the specific capacity of VS2/Ti3C2 composite is 191.3 mAh.g(-1), which is much higher than that of VS2 and Ti3C2. The asymmetric supercapacitors were assembled with VS2/Ti3C2 composites as positive electrodes, and the electrochemical performance was tested when the power density was 1288 W.kg(-1) and the energy density was 24 Wh.kg(-1). The initial capacity retention is 82.2% after 5000 cycles of constant current charge and discharge at the current density of 2 A.g(-1). In short, VS2/Ti3C2 composites show excellent supercapacitor performance in terms of capacity, stability, energy density and power density. It shows that VS2/Ti3C2 is a promising electrode material for supercapacitors.

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