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Volcano-Type Behavior in Spatially Resolved Electron Transfer and Hydrogen Evolution Reaction Mapping over 2D

Septia Kholimatussadiah1,2,3,4, Mohammad Qorbani3,4, Yu-Ling Liu3

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This study maps electron transfer in 2D tungsten diselenide (WSe2) for catalysis. Optimal electrochemical activity was found at four layers, linked to electronic properties and charge tunneling.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Developing efficient electrochemical devices requires understanding interfacial electron transfer dynamics.
  • Two-dimensional (2D) materials are promising catalysts, but their nanoscale electrochemical properties, especially layer-by-layer, are understudied.
  • High-resolution mapping of electron transfer is key to advancing 2D material catalysis.

Purpose of the Study:

  • To spatially resolve and quantify interfacial electron transfer at the 2D semiconducting WSe2 electrode-electrolyte interface.
  • To investigate the layer-dependent electrochemical activity of WSe2.
  • To elucidate the relationship between electronic structure, charge transport, and catalytic performance in WSe2.

Main Methods:

  • In situ electron transfer mapping at the WSe2 electrode-electrolyte interface.
  • High-resolution spatial resolution and quantification of outer-sphere and inner-sphere electron transfer.
  • Micro-electrochemical hydrogen evolution reaction (HER) measurements.

Main Results:

  • Spatially resolved electron transfer dynamics were successfully mapped at the WSe2 interface.
  • WSe2 demonstrated a volcano-type behavior in electrochemical activity, with peak performance at four layers.
  • The observed phenomenon is attributed to the interplay of layer-specific electronic density of states and interlayer charge carrier tunneling.

Conclusions:

  • The study provides critical nanoscale insights into the electrochemical activity of 2D WSe2.
  • Layer thickness significantly influences the catalytic performance of WSe2, with an optimal four-layer structure identified.
  • Understanding these layer-dependent electronic and transport properties is crucial for designing next-generation 2D material-based electrochemical devices.