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Updated: Jun 4, 2025

Fabrication of Thin Film Silver/Silver Chloride Electrodes with Finely Controlled Single Layer Silver Chloride

Fabrication of Thin Film Silver/Silver Chloride Electrodes with Finely Controlled Single Layer Silver Chloride

Published on: July 1, 2020

Kinetics and dynamics of atomic-layer dissolution on low-defect Ag.

Yufei Wang¹, Roberto Garcia-Carrillo¹, Hang Ren^1,2,3

¹Department of Chemistry, The University of Texas at Austin Austin TX 78712 USA hren@utexas.edu.

Chemical Science

|December 23, 2024

Summary

Researchers observed potential oscillations during silver (Ag) electrochemical dissolution, revealing layer-by-layer metal removal. This finding offers a new method for atomic layer etching in nanofabrication.

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Area of Science:

Electrochemistry
Materials Science
Surface Science

Background:

Electrochemical metal dissolution is crucial for technologies like batteries and nanofabrication.
Understanding the kinetics and active sites of these reactions is experimentally difficult.

Purpose of the Study:

To investigate metal dissolution kinetics on single-crystal silver (Ag) surfaces at the nanoscale.
To elucidate the mechanisms behind potential oscillations observed during electrochemical dissolution.

Main Methods:

Utilized scanning electrochemical cell microscopy (SECCM) to study Ag dissolution on nanometer-scale regions of single-crystal surfaces.
Correlated electrochemical data (dissolution charge) with high-resolution imaging of dissolution pits.

Main Results:

Observed potential oscillations under constant current conditions during Ag dissolution.
Established a direct correlation between dissolution charge and pit geometry, indicating layer-by-layer dissolution.
A kinetic model explained oscillations due to the dynamic evolution of active sites during atomic layer dissolution.

Conclusions:

Electrochemical metal dissolution can proceed in atomic layers, evidenced by potential oscillations.
This layer-by-layer dissolution mechanism provides a foundation for electrochemical atomic layer etching.
Enables fabrication of structures and devices with atomic precision.