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[DAAQ-Tp COF] Hybrid Acid/alkali All Covalent Organic Frameworks Battery
Summary:
The authors from Tianjin University and Fujian Institute of Research on the Structure of Matter developed a hybrid acid/alkali all-COFs battery, achieving high discharge capacity and energy density in the field of energy storage.
Background:
1. To address the energy storage problem, previous researchers explored various electrode materials, achieving some success, yet there are still challenges in developing high-performance and cost-effective batteries. 2. The authors in this paper proposed a hybrid acid/alkali all-COFs battery by coupling pyrene-4,5,9,10-tetraone based COF cathode with anthraquinone based COF anode and obtained promising results.
Research Content:
1. Synthesis:
The authors synthesized the 4KT-Tp COF/rGO hybrid cathode and DAAQ-Tp COF anode using the one-pot solvothermal method.
2. Characterizations:
1) BET results show that 4KT-Tp COF/rGO has a specific surface area of 492 m²g⁻¹, and DAAQ-Tp COF has a surface area of 561 m²g⁻¹; pore size distribution is around 2.3 nm for both materials.
2) SEM/TEM tests show the particle size and morphology of the materials, with 4KT-Tp COF/rGO presenting aggregated nanoflakes and DAAQ-Tp COF showing stacked short nanorods.
3) Other electrochemical tests indicate that 4KT-Tp COF/rGO has a discharge capacity of 185.56 mAhg⁻¹ at 0.5 Ag⁻¹ in 0.5 M H₂SO₄ and maintains 118.11 mAhg⁻¹ at 20 Ag⁻¹, while DAAQ-Tp COF delivers a capacity of 123.28 mAhg⁻¹ at 1.0 Ag⁻¹ in 0.1 M KOH + 0.5 M K₂SO₄ and retains about 95.3% at 20 Ag⁻¹.
3. Application:
The hybrid acid/alkali all-COFs battery was tested, and it exhibits a discharge capacity of 92.97 mAhg⁻¹ at 1.0 Ag⁻¹, a wide voltage window of 2.0 V, energy density of 74.2 Whkg⁻¹, and good cyclic stability over 300 cycles.
4. Mechanism:
The analysis of the experiment results shows that the redox reactions of 4KT-Tp COF/rGO and DAAQ-Tp COF in their respective electrolytes contribute to the overall performance of the battery. The reversible transition between orthoquinone and hydroquinone groups in 4KT-Tp COF/rGO, as well as the transformation between C=O group and C-O-K bond in DAAQ-Tp COF, are responsible for the electrochemical performance.
Outlook:
This research achieved significant progress in developing high-performance COFs-based batteries, providing a new direction for the design and application of advanced energy storage devices.
Hybrid Acid/alkali All Covalent Organic Frameworks Battery
Authors: Yunpeng Xu, Pingwei Cai, Kai Chen, Qingsong Chen, Zhenhai Wen, Long Chen
DOI：10.1002/anie.202215584
Link：https://onlinelibrary.wiley.com/doi/10.1002/anie.202215584
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