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2D Metal-Organic Frameworks (MOFs) for High-Performance BatCap Hybrid Devices
Kuaibing Wang1,2, Qingqing Li1, Zhujuan Ren1
1Department of Chemistry, College of Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, 210095, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|June 26, 2020
Summary
Two novel metal-organic frameworks (MOFs), CoFRS and NiFRS, show excellent performance as supercapacitor electrodes. The NiFRS//activated carbon device achieved a high energy density of 28.7 Wh kg-1 in hybrid devices.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Metal-organic frameworks (MOFs) are promising materials for energy storage applications.
- Developing MOFs with enhanced electrochemical properties is crucial for advanced supercapacitors.
Purpose of the Study:
- To synthesize and characterize two identical layered MOFs, CoFRS and NiFRS.
- To evaluate their performance as electrode materials in supercapacitors and hybrid devices.
- To investigate the electrochemical reaction mechanisms and factors influencing performance.
Main Methods:
- Layered MOFs (CoFRS and NiFRS) synthesized using flexible triazole pillars and rigid dicarboxylate linkers.
- Single-crystal X-ray diffraction for structural analysis.
- Electrochemical testing in supercapacitors and battery-supercapacitor (BatCap) hybrid devices.
- Analysis of electrode intermediates before and after cycling.
Main Results:
- CoFRS and NiFRS exhibit fluctuant 2D networks with large interlayer lattices.
- Both MOFs demonstrate excellent rate capabilities, high capacities, and long-term stability as supercapacitor electrodes.
- The NiFRS//activated carbon hybrid device achieved a gravimetric capacitance of 28.7 Wh kg-1, outperforming CoFRS//AC devices and other MOF-based electrodes.
- Identified novel intermediates, distinct from metal hydroxides, in cycled electrodes.
Conclusions:
- The synthesized MOFs are effective electrode materials for supercapacitors and hybrid energy storage devices.
- NiFRS//AC hybrid devices show superior electrochemical performance compared to CoFRS//AC devices.
- The unique structural and electrochemical properties of these MOFs offer potential for next-generation energy storage solutions.
