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Localized Charge Transfer in Two-Dimensional Molybdenum Trioxide.

Vipin Kumar1, Liang Liu1,2, Viet Cuong Nguyen1

  • 1School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798, Singapore.

ACS Applied Materials & Interfaces
|August 8, 2017
PubMed
Summary

Scanning electrochemical microscopy reveals that edges of 2D molybdenum trioxide (MoO3-II) sheets facilitate charge transfer, enabling reduction to conductive molybdenum bronze (HxMoO3) with specific redox couples.

Keywords:
localized charge transfermicroelectrodemolybdenum trioxideredox couplescanning electrochemical microscopy

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Electrochemistry

Background:

  • Molybdenum trioxide (MoO3) exhibits a transition from insulating to semimetallic upon electron doping.
  • Layered two-dimensional (2D) MoO3-II, a polymorph analogous to α-MoO3, presents opportunities for electronic property modulation.

Purpose of the Study:

  • To characterize the local electrogeneration and charge transfer dynamics of 2D MoO3-II.
  • To investigate the influence of different redox couples on the electrochemical behavior of MoO3-II.

Main Methods:

  • Scanning electrochemical microscopy (SECM) was employed to probe the surface of 2D MoO3-II.
  • The study utilized two distinct redox couples: [Ru(NH3)6]3+/[Ru(NH3)6]2+ and [Fe(CN)6]3-/[Fe(CN)6]4-.

Main Results:

  • Reduction of [Ru(NH3)6]3+ effectively reduced MoO3-II to conductive HxMoO3, generating a positive feedback current.
  • Charge conduction was predominantly observed at the more conductive edges of the 2D MoO3-II sheets.
  • [Fe(CN)6]3- showed unfavorable reduction of MoO3-II due to a higher redox potential, resulting in a negative feedback current.

Conclusions:

  • The study elucidates the preferential charge transfer at the edges of 2D MoO3-II.
  • SECM characterization provides insights into locally tuning the oxidation states of MoO3-II coatings.