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MXenes with ordered triatomic-layer borate polyanion terminations.

Dongqi Li1, Wenhao Zheng2, Sai Manoj Gali3

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Researchers developed novel MXene materials with unique borate terminations, significantly enhancing electrical conductivity and charge mobility. These advanced MXenes also show promise for high-capacity energy storage applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • MXene properties are critically dependent on surface terminations, which have historically been limited to simple structures with poor stability.
  • Existing MXene terminations often exhibit disordered arrangements, hindering optimal charge transport and device performance.

Purpose of the Study:

  • To synthesize MXenes with novel triatomic-layer borate polyanion terminations (OBO terminations).
  • To investigate the impact of these new terminations on the electronic properties and charge transport mechanisms of MXenes.
  • To evaluate the potential of OBO-terminated MXenes for energy storage applications.

Main Methods:

  • Employed a flux-assisted eutectic molten etching approach for MXene synthesis.
  • Utilized Lewis acidic salts as etching agents and borax to generate BO2- species for surface capping.
  • Characterized the electronic properties of OBO-terminated Nb2C using d.c. conductivity and charge mobility measurements, analyzing transport via the Drude model.

Main Results:

  • Successfully synthesized MXenes with ordered OBO terminations, contrasting with disordered conventional terminations.
  • OBO-terminated Nb2C exhibited a 15-fold increase in electrical conductivity and a 10-fold improvement in charge mobility compared to Cl/O-terminated Nb2C.
  • OBO-terminated Ti3C2 MXene demonstrated a high charge-storage capacity of 420 mAh g-1 due to enriched Li+-hosting sites.

Conclusions:

  • Intricate OBO terminations offer superior surface ordering, mitigating charge carrier scattering and enhancing electronic properties.
  • The developed OBO-terminated MXenes show significant potential for advanced (opto)electronic devices.
  • These novel MXenes present a promising platform for high-performance energy storage solutions.