MOF‐Derived Porous Carbon for Zinc‐ion Hybrid Capacitors with Ultra‐High Energy Density and Long Cycling Life

Abstract Zinc‐ion hybrid capacitors (ZHC) have been considered as emerging sustainable electrochemical energy storage devices. They integrate the benefits of high‐energy density of aqueous zinc ion battery (ZIB) with high‐power density of supercapacitor (SC). Metal‐organic frameworks (MOFs) have been widely used to design electrode materials for portable devices, especially in some energy storage fields because of their large specific surface area and adjustable pore structures. In this work, we prepare porous Mn 3 O 4 /C nanosheets with Mn‐BDC as a precursor. The assembled device delivers a specific capacitance of 155.3 mAh g −1 at a current of 3 A g −1 and keeps a retention rate of 97.7 % after 10,000 cycles. Moreover, it provides an energy density of 464.5 Wh kg −l at a power density of 100 W kg −1 .