Journal
CHEMSUSCHEM
Volume 13, Issue 9, Pages 2286-2294Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202000425
Keywords
copper; energy storage; macrocycles; porphyrinoids; potassium
Funding
- German Research Foundation (DFG) [390874152] Funding Source: Medline
- National Natural Science Foundation of China [21805236] Funding Source: Medline
- Scientific Research Fund of Hunan Provincial Education Department [18B062] Funding Source: Medline
- Fundamental Research Fund of Xiangtan University [18QDZ14] Funding Source: Medline
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Rechargeable potassium-ion batteries (KIBs) are promising alternatives to lithium-ion batteries for large-scale electrochemical energy-storage applications because of the abundance and low cost of potassium. However, the development of KIBs is hampered by the lack of stable and high-capacity cathode materials. Herein, a functionalized porphyrin complex, [5,15-bis(ethynyl)-10,20-diphenylporphinato]copper(II) (CuDEPP), was proposed as a new cathode for rechargeable potassium batteries. Spectroscopy and molecular simulation studies were used to show that both PF6- and K+ interact with the porphyrin macrocycle to allow a four-electron transfer. In addition, the electrochemical polymerization of the ethynyl functional groups in CuDEPP resulted in the self-stabilization of the cathode, which was highly stable during cycling. This unique charge storage mechanism enabled CuDEPP to provide a capacity of 181 mAh g(-1) with an average potential of 2.8 V (vs. K+/K). These findings could open a pathway towards the design of new stable organic electrodes for KIBs.
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