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Copper Porphyrin as a Stable Cathode for High‐Performance Rechargeable Potassium Organic Batteries
Author(s) -
Lv Shenshen,
Yuan Jingjun,
Chen Zhi,
Gao Ping,
Shu Hongbo,
Yang Xiukang,
Liu Enhui,
Tan Songting,
Ruben Mario,
ZhaoKarger Zhirong,
Fichtner Maximilian
Publication year - 2020
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202000425
Subject(s) - electrochemistry , porphyrin , cathode , potassium , lithium (medication) , materials science , copper , organic radical battery , electron transfer , electrode , chemical engineering , inorganic chemistry , nanotechnology , chemistry , photochemistry , medicine , engineering , metallurgy , endocrinology
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 PF 6 − 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.