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Updated: Jun 7, 2026

Tracking Electrochemistry on Single Nanoparticles with Surface-Enhanced Raman Scattering Spectroscopy and Microscopy
10:59

Tracking Electrochemistry on Single Nanoparticles with Surface-Enhanced Raman Scattering Spectroscopy and Microscopy

Published on: May 12, 2023

Insights into Native Single-Atom Electrocatalyst Site Structures.

Michael J Zachman1, Hasnain Hafiz2, Colum M O'Leary3

  • 1Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge 37831, Tennessee, United States.

ACS Nano
|June 6, 2026
PubMed
Summary
This summary is machine-generated.

Ultralow-voltage electron ptychography reveals the precise local structure of single-atom electrocatalysts. This advancement is crucial for understanding and improving next-generation catalysts for energy applications.

Keywords:
4D-STEMatomic-scale structureelectron ptychographyhigh-resolution imagingsingle-atom electrocatalystsultralow voltage

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Last Updated: Jun 7, 2026

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Single-atom electrocatalysts (SAECs) are vital for diverse applications including green hydrogen production and CO2 reduction.
  • Understanding the local structure of SAECs is key to their activity and stability, but current methods face limitations.

Purpose of the Study:

  • To develop a method for determining the lattice structure around individual metal sites in SAECs.
  • To overcome the beam sensitivity limitations of conventional electron microscopy techniques.

Main Methods:

  • Implementation of ultralow-voltage electron ptychography at 30 keV.
  • Characterization of a well-defined single-atom electrocatalyst system.
  • Pairing atomic-scale measurements with computational methods.

Main Results:

  • Successfully determined the lattice structure around individual metal sites in SAECs.
  • Minimized knock-on structural modifications during imaging.
  • Enabled site-specific structural analysis at the atomic scale.

Conclusions:

  • Ultralow-voltage electron ptychography provides crucial insights into SAEC local structures.
  • This technique accelerates the understanding and development of advanced SAECs.
  • Enhanced understanding will drive progress in catalysis for energy and environmental applications.