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Updated: Sep 29, 2025

Probing Surface Electrochemical Activity of Nanomaterials using a Hybrid Atomic Force Microscope-Scanning Electrochemical Microscope AFM-SECM
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Topography Mapping with Scanning Electrochemical Cell Microscopy.

Gen Liu1, Luzhen Hao1, Hao Li1

  • 1Tianjin International Center for Nanoparticles and Nanosystems, Tianjin University, Tianjin 300072, P. R. China.

Analytical Chemistry
|March 21, 2022
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Summary
This summary is machine-generated.

This study enhances scanning electrochemical cell microscopy (SECCM) for nanoscopic material analysis. The new method achieves high-resolution imaging of topography and electrochemical activity, enabling direct structure-activity correlations.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Nanotechnology

Background:

  • Scanning electrochemical cell microscopy (SECCM) enables simultaneous visualization of material topography and electrochemical activity at the nanoscale.
  • Current SECCM topographical measurements are limited by nanopipette meniscus size and stability.

Purpose of the Study:

  • To develop an improved SECCM scheme for higher resolution topographical and electrochemical measurements.
  • To overcome limitations in current SECCM topographical analysis.

Main Methods:

  • Utilized homemade nanopipette probes with approximately 50 nm inner diameter.
  • Implemented a novel SECCM scheme to achieve reliable nanometer-scale resolution.

Main Results:

  • Achieved a resolution of 65 nm for SECCM topographical measurements.
  • Successfully recorded simultaneous topography and hydrogen evolution reaction (HER) activity of ~45 nm gold nanoparticle monolayers.
  • Demonstrated the capability to map both topological and chemical properties at the nanometer scale.

Conclusions:

  • The developed SECCM scheme significantly enhances resolution for nanoscopic material characterization.
  • This advancement allows for routine, high-resolution mapping of structure and activity, expanding SECCM applications.
  • Facilitates direct correlation between material structure and electrochemical performance at the nanoscale.