Hybrid Acid/alkali All Covalent Organic Frameworks Battery
Yunpeng Xu1, Pingwei Cai2, Kai Chen2
1Department of Chemistry, Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin, 300072, P. R. China.
Angewandte Chemie (International Ed. in English)
|February 25, 2023
Summary
Researchers developed a novel hybrid acid/alkali all-Covalent Organic Frameworks (COFs) battery. This innovative design utilizes distinct COF materials for the cathode and anode, achieving significant energy density and stability.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Covalent Organic Frameworks (COFs) show promise as electrode materials for batteries due to their tunable structures and functional groups.
- Further development of COFs-based batteries is needed to enhance performance and reliability.
- Hybrid battery designs offer opportunities to leverage the unique properties of different materials.
Purpose of the Study:
- To propose and demonstrate a novel hybrid acid/alkali all-COFs battery.
- To investigate the performance of a battery system combining a pyrene-4,5,9,10-tetraone based COF cathode and an anthraquinone based COF anode.
- To explore the potential of COFs in advanced energy storage devices.
Main Methods:
- Fabrication of a hybrid battery system using two distinct COF materials as electrodes.
- Operation of the cathodic COF in an acidic electrolyte and the anodic COF in an alkaline electrolyte.
- Electrochemical characterization to evaluate discharge capacity, voltage window, energy density, and cyclic stability.
Main Results:
- The hybrid acid/alkali all-COFs battery achieved a discharge capacity of 92.97 mAh g-1.
- A wide voltage window of 2.0 V was observed.
- High energy density of 74.2 Wh kg-1 and considerable cyclic stability over 300 cycles were demonstrated.
Conclusions:
- The proof-of-concept hybrid acid/alkali all-COFs battery demonstrates the potential of COFs in advanced energy storage.
- This development could lead to more cost-effective and performance-reliable energy storage devices.
- The distinct electrochemical behavior of COFs in acidic and alkaline media can be effectively coupled in a hybrid system.
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