Abstract
Large-area Co2+/ionic liquid (IL) co-modified porphyrin-COF nanofilm was prepared by the chelation Co2+ ions on porphyrin-N and grafting IL on –OH groups in COFTAPP-DHPA skeleton respectively. This IL-Co-COFTAPP-DHPA self-supporting film can directly customized into interdigital electrodes, and assembled as flexible MSC-IL-Co-COFTAPP-DHPA devices. The MSC-IL-Co-COFTAPP-DHPA device exhibits the good energy storage properties, such as the high energy density of 67.2 mWh/cm3 at 3.46 W/cm3, good cycling stability with capacitance retention of 91 % after 5,000 cycles. These outstanding performances can be explained by the fact that the chelated Co2+ ions can provide the additional Faradaic redox reaction, and grafted long-chain IL can improve the charge accumulation capacity by pore channel segmentation and growing adsorbing H+ active sites. Notably, the MSC-IL-Co-COFTAPP-DHPA owns the high anti-bending property, allowing for bending at different angles. This work can broaden the COF film application prospects in flexible, wearable electronic devices.
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