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Unlocking Mesoscopic Disorder in Graphitic Carbon with Spectroelectrochemistry.

Ry Papadopoulos¹, Benjamin Masters¹, Arpan Kundu^1,2

¹Department of Chemistry, University of Chicago, Chicago, IL, 60637, United States.

Angewandte Chemie (International Ed. in English)

|December 30, 2024

Summary

This summary is machine-generated.

Researchers developed a new method to distinguish ordered graphitic regions from disordered areas in carbon electrodes using electric-field dependent infrared spectroscopy. This technique helps understand materials for energy storage and conversion technologies.

Keywords:

Disordered graphitic carbon electrodes first-principles calculations in-situ infrared spectroscopy

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Scanning-probe Single-electron Capacitance Spectroscopy

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Area of Science:

Materials Science
Electrochemistry
Spectroscopy

Background:

Graphitic carbon electrodes are crucial for energy conversion and storage.
Intrinsic defects in these electrodes can impact performance.
Characterizing graphitic vs. disordered regions in bulk materials is challenging.

Purpose of the Study:

To develop a method for differentiating graphitic regions from mesoscopic bulk disorder in carbon electrodes.
To understand the influence of intrinsic defects on electrode properties under electrochemical conditions.

Main Methods:

Utilized in-situ attenuated total reflectance infrared spectroscopy.
Employed first-principles calculations.
Applied electrochemical potential bias.

Main Results:

Discovered electric-field dependent infrared activity in graphitic carbon electrodes.
Showed this activity is sensitive to bulk mesoscopic intrinsic disorder.
Identified opposing electric-field-dependent infrared responses between graphitic and amorphous domains.

Conclusions:

The combined spectroscopic and computational approach allows for in-situ atomistic differentiation of graphitic and amorphous regions.
This provides a roadmap for characterizing mesoscopic disorder in bulk carbon materials under potential bias.
Enables better understanding and design of carbon electrodes for energy technologies.