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.

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