Electrophoretic Deposition of Binder‐Free MOF‐Derived Carbon Films for High‐Performance Microsupercapacitors

Recently, miniaturized power supplies have become essential components of micro-electromechanical systems (MEMS) and micro portable microdevices due to their high-power density, moderate specific energy, and superior long-term cyclability. In this study, we successfully fabricate microsupercapacitors with ZIF-8 derived carbons as active materials via electrophoretic deposition method. The carbon materials on microsupercapacitors, which are directly deposited or obtained by pyrolyzing pre-deposited ZIF-8 particles, play a crucial role in achieving outstanding electrochemical performances. The microsupercapacitor of 16 interdigital finger electrodes, prepared by electrophoretic deposition of ZIF-8 particles and subsequent pyrolysis, shows maximum specific power 687.6 mW cm -3 , specific energy 2.87 mWh cm -3 and 97.8% capacitance retention rate after 10,000 cycles. The simple and facile process of electrophoretic deposition and subsequent pyrolysis of ZIF-8 particles generates a film of densely populated microporous carbon particles on microsupercapacitor, leading to superior capacitive performances.