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Probing Surface Electrochemical Activity of Nanomaterials using a Hybrid Atomic Force Microscope-Scanning Electrochemical Microscope AFM-SECM

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Electrochemical AFM/STM with a qPlus sensor: A versatile tool to study solid-liquid interfaces.

Andrea Auer¹, Bernhard Eder¹, Franz J Giessibl¹

¹Institute of Experimental and Applied Physics, University of Regensburg, 93053 Regensburg, Germany.

The Journal of Chemical Physics

|November 1, 2023

Summary

This summary is machine-generated.

This study presents a new instrument combining atomic force microscopy (AFM) and scanning tunneling microscopy (STM) for electrochemical interfaces. It achieves atomic resolution imaging and measures solvent layering in acidic electrolytes.

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Area of Science:

Surface science
Electrochemistry
Nanotechnology

Background:

Atomic force microscopy (AFM) and scanning tunneling microscopy (STM) offer high spatial resolution.
Simultaneous AFM/STM requires specialized instrumentation for complex environments.
Electrochemical interfaces present unique challenges for nanoscale imaging.

Purpose of the Study:

To present a novel combined AFM/STM instrument for electrochemical applications.
To demonstrate atomic resolution imaging at electrochemical interfaces.
To investigate interfacial water structure and electrochemical interface properties.

Main Methods:

Utilized a qPlus sensor for AFM/STM tip integration.
Developed a home-built potentiostat for electrochemical control.
Performed simultaneous AFM/STM imaging in acidic electrolytes.

Main Results:

Achieved atomic resolution imaging of graphite in acidic electrolytes.
Demonstrated precise measurement of interfacial solvent layering.
Showcased potential-dependent solvent structure analysis.

Conclusions:

The developed AFM/STM instrument enables unprecedented insights into electrochemical interfaces.
This technology facilitates detailed studies of interfacial water and surface structure.
Opens new avenues for understanding electrochemical processes at the nanoscale.