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Spatially Confined Microcells: A Path toward TMD Catalyst Design.

Shasha Guo1, Mingyu Ma1,2, Yuqing Wang1

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

Chemical Reviews
|May 15, 2024
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Summary

Two-dimensional transition metal dichalcogenides (TMDs) show promise for electrocatalysis. Electrochemical microcells, like OCEM and SECCM, enable single-material analysis, advancing the understanding of TMD electrocatalyst behavior.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Two-dimensional transition metal dichalcogenides (TMDs) offer high active site exposure for electrocatalysis.
  • Electrochemical microcells provide spatial confinement for single-material level analysis of catalytic behaviors.

Purpose of the Study:

  • To review recent advancements in microcell-based studies of transition metal dichalcogenide (TMD) electrocatalysts.
  • To elucidate the structural characteristics and site engineering strategies of TMDs for electrocatalysis.

Main Methods:

  • Detailed description of window-confined on-chip electrochemical microcells (OCEM) and droplet-confined scanning electrochemical cell microscopy (SECCM), including their setups, principles, and instrumentation.
  • Overview of microcell-based techniques for studying TMD electrocatalysts.

Main Results:

  • Summary of recent advances using OCEM and SECCM in TMD catalysis, including active site identification, imaging, and monitoring.
  • Discussion of modulation of charge injection, transport, and electrostatic field gating in TMD catalysts.
  • Elucidation of structural characteristics and site engineering strategies for TMD electrocatalysis.

Conclusions:

  • Microcell technologies significantly promote the understanding of TMD electrocatalyst behavior at the single material level.
  • Future research directions and challenges in electrochemical microcell technology for TMD electrocatalysis are discussed.