Electroactive Ionic Polymer of Intrinsic Microporosity for High-Performance Capacitive Energy Storage
A M Mahmudul Hasan1, Saptasree Bose2, Rupam Roy1
1Department of Chemistry, Butler Polymer Research Laboratory, University of Florida, Gainesville, FL, 32611, USA.
Advanced Materials (Deerfield Beach, Fla.)
|June 8, 2024
Summary
Ionic polymers of intrinsic microporosity (PIMs) offer high-performance supercapacitor electrodes without additives. Their unique structure enables rapid ion access, leading to excellent energy and power density with long-term stability.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Supercapacitors require efficient electrode materials for energy storage.
- Conventional electrodes often rely on conductive additives and binders, which can limit performance.
- Polymers of intrinsic microporosity (PIMs) offer unique structural properties for advanced applications.
Purpose of the Study:
- To report an ionic polymer of intrinsic microporosity (PIM) as a high-functioning supercapacitor electrode.
- To investigate the role of porosity and ion accessibility in the electrochemical performance of PIMs.
- To demonstrate the potential of PIMs as standalone supercapacitor electrodes without additives.
Main Methods:
- Synthesis and characterization of porous and nonporous viologen PIMs.
- Electrochemical testing of PIMs as supercapacitor electrodes in H2SO4 and Na2SO4 electrolytes.
- Evaluation of long-term cycling stability and performance in a two-electrode device.
Main Results:
- The porous ionic PIM demonstrated high pseudocapacitive energy (315 F g-1 in H2SO4) and capacitive energy density (250 F g-1 in Na2SO4).
- Performance was attributed to the large accessible surface area and rapid ion transport within the PIM structure.
- The material exhibited excellent cycling stability (>10,000 cycles) without conductive additives or binders.
- A prototype symmetric supercapacitor showed high Coulombic efficiency (>99%) and minimal capacity fade (<10 mF over 2000 cycles).
Conclusions:
- Ionic PIMs function effectively as standalone supercapacitor electrodes, eliminating the need for additives.
- The intrinsic microporosity and ionic nature of PIMs are key to their high electrochemical performance.
- Ionic PIMs show promise for other electrochemical applications, including sensors, ion-separation membranes, and displays.
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