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Probing Electrified Liquid-Solid Interfaces with Scanning Electron Microscopy.

Hongxuan Guo1,2,3, Alexander Yulaev2,3, Evgheni Strelcov2,3

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Summary
This summary is machine-generated.

Secondary electrons probe nanoscale electrical double layers at solid-liquid interfaces. Graphene electrodes reveal how electrolyte properties and voltage affect these layers, enabling scanning electron microscopy analysis.

Keywords:
electrical double layerelectrified interfaceselectrochemistryelectrolytegraphene electrodeliquid cellpolarizationscanning electron microscopysecondary electron emission

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Area of Science:

  • Electrochemistry
  • Surface Science
  • Materials Science

Background:

  • Electrical double layers are crucial in electrochemical systems.
  • Secondary electrons have a nanometer mean free path in aqueous solutions, ideal for probing thin layers.
  • Graphene's electron transparency makes it suitable for interface studies.

Purpose of the Study:

  • To investigate the use of secondary electron yield for characterizing electrical double layers.
  • To explore the influence of electrolyte concentration, ionic strength, and applied bias on the graphene-liquid interface.
  • To demonstrate the application of scanning electron microscopy for mapping electrified interfaces.

Main Methods:

  • Utilized a two-electrode electrochemical system with a graphene-based electron-transparent electrode.
  • Measured secondary electron yield at the graphene-liquid interface.
  • Varied electrolyte ionic strength, concentration, and applied bias.

Main Results:

  • Secondary electron yield was sensitive to electrolyte ionic strength and concentration.
  • Applied bias at the counter electrode significantly influenced the secondary electron yield.
  • Observed changes were attributed to potential distribution alterations within the electrical double layer.

Conclusions:

  • Secondary electron yield is a viable method for probing electrical double layers.
  • Scanning electron microscopy can be used to examine and map electrified solid-liquid interfaces.
  • Findings highlight the role of polarization in interfacial potential distribution.