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Processes at Electrodes

Processes at Electrodes

The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...

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Updated: May 11, 2026

A Closed-Type Wireless Nanopore Electrode for Analyzing Single Nanoparticles

A Closed-Type Wireless Nanopore Electrode for Analyzing Single Nanoparticles

Published on: March 20, 2019

Nanoscale Structure Dynamics within Electrocatalytic Materials.

Cameron L Bentley¹, Minkyung Kang¹, Patrick R Unwin¹

¹Department of Chemistry, University of Warwick , Coventry CV4 7AL, U.K.

Journal of the American Chemical Society

|October 24, 2017

Summary

This summary is machine-generated.

A new nanoscale imaging technique reveals the precise activity of electrocatalytic sites. This method visualizes catalytic materials, showing that defects enhance activity and individual nanoparticles have varied reaction rates.

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

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Area of Science:

Electrochemistry
Nanomaterials Science
Surface Science

Background:

Nanostructured materials are crucial for electrochemical applications like sensing and catalysis.
Current methods struggle to probe the intrinsic activity of specific sites on these nanostructures.

Purpose of the Study:

To develop and demonstrate a nanoscale imaging technique for simultaneous topographical and electrochemical analysis.
To investigate the activity of specific sites on nanostructured electrocatalysts.

Main Methods:

Utilizing a 30 nm meniscus imaging probe for direct electrochemical and topographical imaging.
Synchronously collecting spatially resolved topographical and electrochemical data.
Generating high-resolution topographical images and potential-resolved electrochemical activity movies.

Main Results:

Demonstrated the technique on molybdenum disulfide (MoS2) for the hydrogen evolution reaction, revealing uniform basal plane activity and enhanced activity at step edges.
Investigated hydrazine electro-oxidation on gold nanoparticles (AuNPs), showing significant reactivity variations across individual AuNP surfaces.
Achieved sub-nanoparticle reactivity mapping, proving that single AuNPs are not uniformly active.

Conclusions:

The developed technique provides direct, unambiguous visualization of active sites on nanostructured electrocatalysts.
Reveals morphology-dependent activity enhancements at material defects and non-uniform reactivity across single nanoparticles.
Offers a roadmap for future electrochemical studies using quantitative activity movies to understand nanostructured material behavior.