Synthesis and electrochemical properties of V2C MXene by etching in opened/closed environments

Abstract

The effect of etching environment (opened or closed) on the synthesis and electrochemical properties of V2C MXene was studied. V2C MXene samples were synthesized by selectively etching of V2AlC at 90 °C in two different environments: opened environment (OE) in oil bath pans under atmosphere pressure and closed environment (CE) in hydrothermal reaction kettles under higher pressures. In OE, only NaF (sodium fluoride) + HCl (hydrochloric acid) etching solution can be used to synthesize highly pure V2C MXene. However, in CE, both LiF (lithium fluoride) + HCl and NaF+HCl etchant can be used to prepare V2C MXene. Moreover, the V2C MXene samples made in CE had higher purity and better-layered structure than those made in OE. Although the purity of V2C obtained by LiF+HCl is lower than that of V2C obtained using NaF+HCl, it shows better electrochemical performance as anodes of lithium-ion batteries (LIBs). Therefore, etching in CE is a better method for preparing highly pure V2C MXene, which provides a reference for expanding the synthesis methods of V2C with better electrochemical properties.

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Acknowledgements

This study was supported by the National Natural Science Foundation of China (51772077), the Program for Innovative Research Team (in Science and Technology) in University of Henan Province (19IRTSTHN027), the Fundamental Research Funds for the Universities of Henan Province (NSFRF200101), the China Postdoctoral Science Foundation (2019M652537), the Henan Postdoctoral Foundation (19030065), the Henan Province Key Science and Technology Research Projects (202102310628), the Foundation of Henan Educational Committee (20B430006), and the Doctoral Foundation of Henan Polytechnic University (B2019-41).

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Correspondence to Qixun Xia or Aiguo Zhou.

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Wu, M., He, Y., Wang, L. et al. Synthesis and electrochemical properties of V2C MXene by etching in opened/closed environments. J Adv Ceram (2020). https://doi.org/10.1007/s40145-020-0411-8

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Keywords

  • V2C MXene
  • etching environment
  • oil bath pan
  • hydrothermal reaction kettle
  • lithium-ion battery (LIB)