Pushing the Energy Output and Cycling Lifespan of Potassium-Ion Capacitor to High Level through Metal-Organic Framework Derived Porous Carbon Microsheets Anode

Potassium ion capacitors (PIC) have been extensively explored as an economically favorable substitute for their well-developed lithium ion counterparts. However, their commercialization suffers from their low energy density and relatively short cycling life. Here, a porous carbon microsheets anode is produced by morphology-preserved thermal transformation of sheet-like manganese-based metal-organic frameworks. The as-produced porous carbon microsheets anode has a disordered, interlayer-expanded, oxygen-doped structure, which is demonstrated to have excellent K(+)storage properties in terms of specific capacity, rate capability, and cycling stability. A PIC fabricated by employing Mn-MOF derived porous carbon (MDPC) as the anode and activated carbon as the cathode, yields an energy density of up to 120 Wh kg(-1)and a maximum power density of 26 kW kg(-1)as well as a long-term cycling life over 120 000 cycles, which is close to those of most Li-ion counterparts. These promising results demonstrate that exploring novel carbon anodes can promote the rapid development of PICs toward practical applications.