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Journal of Advanced Ceramics 2023, 12(10): 1889-1901 https://doi.org/10.26599/JAC.2023.9220795
Research Article | Open Access | Issue | Published: 25 October 2023

Synthesis of Mo2C MXene with high electrochemical performance by alkali hydrothermal etching

Show Author's Information Yitong Guo,  Xin Zhang( ),  Sen Jin,  Qixun Xia,  Yukai Chang,  Libo Wang,  Aiguo Zhou( )
School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
Keywords:
two-dimensional materials, MXene, lithium-ion battery, NaOH etching
Cite this article:
Guo Y, Zhang X, Jin S, et al. Synthesis of Mo2C MXene with high electrochemical performance by alkali hydrothermal etching. Journal of Advanced Ceramics, 2023, 12(10): 1889-1901. https://doi.org/10.26599/JAC.2023.9220795
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Abstract Full text About this article

Two-dimensional MXenes are generally prepared by the etching of acid solutions. The as-synthesized MXenes are terminated by acid group anions (F–, Cl–, etc.), which affect the electrochemical performance of MXenes. Here, we report a novel method to prepare Mo2C MXene from Mo2Ga2C by the hydrothermal etching of alkali solutions. Highly pure Mo2C MXene was successfully synthesized by the etching of NaOH, while the etchings of LiOH and KOH were failed. The concentration of NaOH, temperature, and time strongly affect the purity of as-prepared MXene. Pure Mo2C MXene could be synthesized by the etching of 20 M NaOH at 180 ℃ for 24 h. After intercalation by hexadecyl trimethyl ammonium bromide at 90 ℃ for 96 h, few-layer Mo2C MXene was obtained. The Mo2C MXene made by NaOH etching after intercalation exhibited excellent performance as anode of lithium-ion battery, compared with general Mo2C MXene made by HF etching and the Mo2C MXene reported in literature. The final discharge specific capacity was 266.73 mAh·g−1 at 0.8 A·g−1, which is 52% higher than that Mo2C made by HF etching (175.77 mAh·g−1). This is because Mo2C MXene made by NaOH etching has lager specific surface area, lower resistance, and pure O/OH termination without acid anion termination. This is the first report to make Mo2C MXene by alkali etching and the samples made by this method exhibited significantly better electrochemical performance than the samples made by general HF etching.


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Synthesis of Mo2C MXene with high electrochemical performance by alkali hydrothermal etching

Show Author's information Yitong Guo, Xin Zhang( ), Sen Jin, Qixun Xia, Yukai Chang, Libo Wang, Aiguo Zhou( )
School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China

Abstract

Two-dimensional MXenes are generally prepared by the etching of acid solutions. The as-synthesized MXenes are terminated by acid group anions (F–, Cl–, etc.), which affect the electrochemical performance of MXenes. Here, we report a novel method to prepare Mo2C MXene from Mo2Ga2C by the hydrothermal etching of alkali solutions. Highly pure Mo2C MXene was successfully synthesized by the etching of NaOH, while the etchings of LiOH and KOH were failed. The concentration of NaOH, temperature, and time strongly affect the purity of as-prepared MXene. Pure Mo2C MXene could be synthesized by the etching of 20 M NaOH at 180 ℃ for 24 h. After intercalation by hexadecyl trimethyl ammonium bromide at 90 ℃ for 96 h, few-layer Mo2C MXene was obtained. The Mo2C MXene made by NaOH etching after intercalation exhibited excellent performance as anode of lithium-ion battery, compared with general Mo2C MXene made by HF etching and the Mo2C MXene reported in literature. The final discharge specific capacity was 266.73 mAh·g−1 at 0.8 A·g−1, which is 52% higher than that Mo2C made by HF etching (175.77 mAh·g−1). This is because Mo2C MXene made by NaOH etching has lager specific surface area, lower resistance, and pure O/OH termination without acid anion termination. This is the first report to make Mo2C MXene by alkali etching and the samples made by this method exhibited significantly better electrochemical performance than the samples made by general HF etching.

Keywords: two-dimensional materials, MXene, lithium-ion battery, NaOH etching

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Publication history
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Publication history

Received: 09 June 2023
Revised: 10 July 2023
Accepted: 02 August 2023
Published: 25 October 2023
Issue date: October 2023

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© The Author(s) 2023.

Acknowledgements

This work was supported by the National Natural Science Foundation of China (52275187, 52202364), Natural Science Foundation of Henan (232300421135), and Fundamental Research Funds for the Universities of Henan Province (NSFRF200101).

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