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Published on: June 9, 2023
A Two-Dimensional Porphyrin Coordination Supramolecular Network Cathode for High-Performance Aqueous Dual-Ion Battery
Yuanming Tan1, Zhao Chen1, Zengren Tao1
1MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China.
A novel 2D porphyrin-based coordination supramolecular network (Zn-TCPP) effectively addresses high triiodide solubility issues in aqueous iodine dual-ion batteries (DIBs). This cathode material demonstrates superior energy storage performance and stability.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Iodine's potential in energy storage is limited by high triiodide (I3-) solubility.
- Two-dimensional coordination supramolecular networks (2D CSNs) offer abundant active sites and open channels for energy storage applications.
Purpose of the Study:
- To develop a novel cathode material for aqueous iodine dual-ion batteries (DIBs) that overcomes the limitations of high triiodide solubility.
- To investigate the electrochemical performance and structural properties of a 2D porphyrin-based CSN.
Main Methods:
- Synthesis and characterization of a 2D porphyrin-CSN cathode (Zn-TCPP).
- Electrochemical testing of the Zn-TCPP cathode in an aqueous iodine DIB.
- Spectroscopic analyses (UV/VIS, Raman) and computational studies (Molecular Orbital Theory, DFT, CFD) to elucidate charge transfer and structural contributions.
Main Results:
- The Zn-TCPP cathode exhibited a high specific capacity of 278 mAh g-1 and energy density of 340 Wh kg-1 at 5 A g-1.
- Exceptional cycling stability with 5000 cycles and 98% Coulombic efficiency were achieved.
- Charge-transfer interactions between porphyrin nitrogen and I3- were confirmed, alongside the beneficial role of the 2D layered structure in I3- penetration.
Conclusions:
- The developed 2D porphyrin-CSN (Zn-TCPP) is a promising cathode material for aqueous iodine DIBs.
- The material effectively mitigates triiodide solubility issues, leading to enhanced energy storage performance and durability.
- Understanding the charge transfer mechanisms and structural benefits provides a pathway for designing advanced battery materials.
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