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Tuning MXene Properties through Cu Intercalation: Coupled Guest/Host Redox and Pseudocapacitance
Shianlin Wee1, Xiliang Lian2, Evgeniya Vorobyeva1
1Electrochemical Energy Systems Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland.
ACS Nano
|March 21, 2024
Summary
Copper ion intercalation into Ti3C2Tx MXenes enhances electrochemical properties. Cu2+ ions partially reduce upon intercalation, and both Cu and the MXene host contribute to pseudocapacitance, enabling stable performance.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- MXenes are 2D materials with tunable properties via ion intercalation.
- Intercalation of redox-active transition metals in MXenes is understudied.
- Understanding ion behavior impacts MXene applications in energy storage.
Purpose of the Study:
- Investigate copper ion intercalation into Ti3C2Tx MXene.
- Determine the impact on electronic and electrochemical properties.
- Explore the mechanism of pseudocapacitive behavior.
Main Methods:
- X-ray absorption spectroscopy (XAS) for oxidation state analysis.
- Ab initio molecular dynamics (AIMD) for structural insights.
- In situ XAS to observe dynamic changes during charging.
Main Results:
- Observed partial reduction of Cu2+ to Cu+ upon intercalation.
- Identified redox activity from both Cu ions and Ti3C2Tx host during charging.
- Demonstrated excellent stability of intercalated Cu ions against reduction.
Conclusions:
- Electronic coupling between Cu and Ti3C2Tx modifies MXene properties.
- Cu-MXene exhibits pseudocapacitance due to coupled redox.
- Provides a framework for designing MXenes with transition metal intercalants for electrochemical systems.
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