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Operando Scanning Electrochemical Probe Microscopy during Electrocatalysis.

Carla Santana Santos1, Bright Nsolebna Jaato2, Ignacio Sanjuán2

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Scanning electrochemical probe microscopy (SEPM) reveals local electrochemical reactivity at interfaces. Operando SEPM correlates electrocatalyst performance with surface changes, offering insights into reaction mechanisms for O2, H2, and CO2 conversion.

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Area of Science:

  • Electrochemistry
  • Surface Science
  • Microscopy

Background:

  • Scanning electrochemical probe microscopy (SEPM) enables localized electrochemical studies.
  • Operando SEPM allows simultaneous investigation of electrocatalyst performance and interface properties.
  • Understanding local reactivity is crucial for designing efficient electrocatalysts.

Purpose of the Study:

  • To review recent advancements in SEPM for studying electrocatalytic reactions.
  • To highlight SEPM's capability in analyzing oxygen reduction/evolution and CO2 conversion.
  • To explore the integration of SEPM with other microscopy techniques.

Main Methods:

  • Operando SEPM measurements.
  • Utilizing SEPM tips to probe electrocatalyst interfaces.
  • Correlating electrochemical activity with surface topography and structure.

Main Results:

  • Demonstrated SEPM's effectiveness in mapping local electrochemical reactivity.
  • Showcased applications in O2 and H2 electrocatalysis and CO2 electrochemical conversion.
  • Presented the synergy of SEPM with techniques like SECM, SICM, EC-STM, and SECCM.

Conclusions:

  • SEPM is a powerful tool for in-situ characterization of electrocatalytic interfaces.
  • Combining SEPM with other methods enhances its analytical capabilities.
  • This review provides a comprehensive overview of SEPM's progress and potential.