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NH4+-Modulated Cathodic Interfacial Spatial Charge Redistribution for High-Performance Dual-Ion Capacitors
Yumin Chen1, Ziyang Song2, Yaokang Lv3
1Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, People's Republic of China.
Nano-Micro Letters
|January 27, 2025
Summary
Ammonium ions (NH4+) improve zinc hybrid capacitors by enabling co-storage with zinc ions (Zn2+). This strategy enhances charge distribution and boosts capacitor performance, offering a promising direction for advanced energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Zinc hybrid capacitors are crucial for energy storage.
- Current charge carriers like Zn2+ have limitations.
- NH4+ is a potential superior charge carrier due to its size and weight.
Purpose of the Study:
- To investigate NH4+ as a charge carrier in zinc hybrid capacitors.
- To optimize cathodic interfacial electrochemical behaviors.
- To achieve dynamic Zn2+/NH4+ co-storage for enhanced capacitor performance.
Main Methods:
- Developed an NH4+-modulated cationic solvation strategy.
- Utilized a hybrid Zn(CF3SO3)2-NH4CF3SO3 electrolyte.
- Analyzed cathodic interfacial Helmholtz plane reconfiguration and charge storage mechanisms.
Main Results:
- Achieved a 20% capacity enhancement in zinc hybrid capacitors.
- Demonstrated superior charge kinetics and stability with NH4+ compared to Zn2+ due to lower desolvation energy.
- Observed high capacity (240 mAh g-1), large-current tolerance (130 mAh g-1 at 50 A g-1), and an ultralong lifespan (400,000 cycles).
Conclusions:
- NH4+-modulated cationic solvation is effective for optimizing zinc hybrid capacitors.
- Dynamic Zn2+/NH4+ co-storage enhances spatial charge density and capacitor performance.
- This approach offers new insights for designing advanced cathode-electrolyte interfaces for zinc-based energy storage.
Keywords:
Dual-ion capacitorNH4
+-modulated cathodic interfaceSpatial charge redistributionZn2+/NH4
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