Block Copolymer Derived Uniform Mesopores For Supercapacitors

High mass loading and fast charge transport are two crucial but often mutually exclusive characteristics of pseudocapacitors. On conventional carbon supports, high mass loadings inevitably lead to sluggish electron conduction and ion diffusion due to the thick pseudocapacitive layer and clogged pores. Herein from the macromolecular perspective, we revolutionize the design of carbon supports. Utilizing block copolymers that microphase-separate, we synthesize porous carbon fibers (PCFs) with uniform mesopores, which are partially filled with MnO₂. The uniform mesopores and ultrathin MnO₂ enable fast electron/ion transport comparable to carbons in electrical double layer capacitors. The gravimetric and areal capacitances of MnO₂ reach 1148 F/g and 3141 mF/cm², respectively.