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Iodine-Functionalized Titanium Carbide MXene with Ultra-Stable Pseudocapacitor Performance.
Siqi Gong1, Fan Zhao1, Huiting Xu1
1School of Chemical Engineering and Technology, National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization, Hebei University of Technology, Tianjin 300130, China.
Journal of Colloid and Interface Science
|February 14, 2022
Summary
Introducing iodine terminations on MXene (I-Ti3C2 MXene) significantly enhances supercapacitor performance. This novel material demonstrates superior capacitance and exceptional cyclic stability over 100,000 cycles.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- MXene materials are promising for supercapacitors due to conductivity and redox properties.
- Supercapacitor performance is highly dependent on MXene surface terminations.
- Controlling surface terminations for improved performance remains a challenge.
Purpose of the Study:
- To prepare and investigate MXene with iodine terminations (I-Ti3C2 MXene) for supercapacitor applications.
- To enhance the electrochemical performance of MXene-based supercapacitors through surface modification.
- To understand the mechanisms behind the improved performance.
Main Methods:
- Facile Lewis-acidic-melt etching method for synthesizing I-Ti3C2 MXene.
- Comprehensive electrochemical characterization of supercapacitor performance.
- Systematic characterizations to elucidate underlying mechanisms.
Main Results:
- I-Ti3C2 MXene exhibits significantly higher specific capacitance compared to hydrofluoric acid etched MXene (HF-Ti3C2Tx MXene).
- The I-Ti3C2 MXene demonstrates pseudocapacitor properties.
- Extraordinary long-term cyclic stability with 91% capacitance retention over 100,000 cycles at 50 A/g.
Conclusions:
- Surface modification with iodine terminations effectively enhances MXene supercapacitor performance.
- I-Ti3C2 MXene offers a promising pathway for developing high-performance energy storage devices.
- This study provides insights into surface chemistry modification for advanced MXene materials.
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