High mass loading and fast charge transport are two crucial but often mutually exclusive characteristics of pseudocapacitive electrodes. 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 of ~11 nm, which are partially filled with MnO2 of less than 2 nm in thickness. The uniform mesopores and ultrathin MnO2 enable fast electron/ion transport comparable to carbons in electrical double layer capacitors. At mass loadings approaching 7 mg/cm2, the gravimetric and areal capacitances of MnO2 (~50% of total mass) reach 1148 F/g and 3141 mF/cm2, respectively. Our PCF@MnO2 outperforms other MnO2-based electrodes at similar loadings and testing conditions, highlighting the great promise of block copolymers for designing PCF supports for electrochemical applications.

Design block copolymers with uniform mesopores for ultrafast electron and ion transport at high mass loadings

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.