Exquisitely functionalized porphyrin-COF self-supporting nanofilm for high-performance in-plane micro-supercapacitor

Large-area Co 2+ /ionic liquid (IL) co-modified porphyrin-COF nanofilm was prepared by the chelation Co 2+ ions on porphyrin-N and grafting IL on –OH groups in COF TAPP-DHPA skeleton respectively. This IL-Co-COF TAPP-DHPA self-supporting film can directly customized into interdigital electrodes, and assembled as flexible MSC-IL-Co-COF TAPP-DHPA devices. The MSC-IL-Co-COF TAPP-DHPA device exhibits the good energy storage properties, such as the high energy density of 67.2 mWh/cm 3 at 3.46 W/cm 3 , good cycling stability with capacitance retention of 91 % after 5,000 cycles. These outstanding performances can be explained by the fact that the chelated Co 2+ 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-COF TAPP-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.