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Phase, Conductivity, and Surface Coordination Environment in Two-Dimensional Electrochemistry.

Yangye Sun, Peiyuan Zhuang, Wei Jiang1

  • 1Shanghai Institute of Technical Physics of the Chinese Academy of Sciences , Shanghai 200083 , P. R. China.

ACS Applied Materials & Interfaces
|July 4, 2019
PubMed
Summary
This summary is machine-generated.

Researchers engineered molybdenum ditelluride (MoTe2) electrocatalysts, improving conductivity and unlocking performance for hydrogen evolution reactions. This advancement offers a model for understanding fundamental factors in electrocatalyst design.

Keywords:
conductivityelectrochemistrymodel catalystphasesurface coordination environmenttwo-dimensional materials

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Electrocatalyst advancements often rely on trial and error.
  • Fundamental factors like phase, conductivity, and surface coordination are not well understood.
  • A need exists for model systems to study these factors.

Purpose of the Study:

  • To use phase-controllable, 2D molybdenum ditelluride (MoTe2) as a model catalyst.
  • To investigate the impact of engineered conductivity on electrocatalytic performance.
  • To elucidate the role of different MoTe2 phases and atomic sites in catalysis.

Main Methods:

  • Synthesis of phase-controllable, highly oriented 2D MoTe2.
  • Extrinsic and intrinsic conductivity engineering of 2H-MoTe2 using graphene and lithiation.
  • Electrocatalytic performance testing for hydrogen evolution reaction.
  • Focused ion beam (FIB) for exposing edge sites.

Main Results:

  • Engineered conductivity of 2H-MoTe2 reduced sheet resistance significantly (0.95 MΩ/□ to 0.8 kΩ/□ and 0.6 kΩ/□).
  • Electrocatalytic performance of engineered 2H-MoTe2 matched its 1T' counterpart (Tafel slope: 141 mV/dec).
  • Edge atoms showed 10^4 times higher hydrogen evolution turnover frequency than basal plane atoms.

Conclusions:

  • Phase-controllable 2D MoTe2 serves as an effective model catalyst.
  • Conductivity engineering is crucial for unlocking electrocatalytic potential.
  • Edge sites are significantly more active than basal planes for hydrogen evolution.