| 초록 |
Laser-induced graphene (LIG) typically shows a mesostructure having a microscale surface area, which lead to low electrochemical performance of micro-supercapacitors (MSCs). Herein, we report LIG electrodes with 3D nanostructure patterned on fluorinated polyimides (fPI) using a laser photothermal method. Via laser-induced graphitization of fPI, fluorine-containing gaseous are significantly generated, producing a microporous structure. The patterned LIG (LIG-fPI) exhibits a very large specific surface area, thereby enhancing its electrochemical performance. More importantly, the microstructured electrode exhibits an exceptional areal capacitance of 110 mF cm–2 in an H2SO4 aqueous electrolyte, which is 27 times higher than that of a LIG based on commercial polyimides and at least 7 times higher than that of current MSCs. Furthermore, flexible LIG-fPI-MSCs in an organic gel polymer electrolyte show high energy and power densities of 0.58 mW cm–2 and 0.01 mWh cm–2, respectively. |
