A novel composite electrode has been fabricated by direct deposition MnO2 onto graphene network surrounding paper fiber (PFG). The paper fiber between graphene sheets can be used as flexible substrates for MnO2 nanoparticles, and the microscopic morphologies and electrochemical performances of MnO2@PFG electrodes were synthesized and designed through regulating different deposition current densities and deposition times. The 3D graphene on PFG served as highly conductive backbones with high surface area for deposition of nanoparticles MnO2, which provided the high accessibility of electrolytic ions for shorten diffusion paths. The MnO2-10-600 s@PFG composite electrode achieved a maximum specific capacitance of 878.6 mF/cm2 with a MnO2 loading mass of 3.62 mg/cm2 (specific capacitance of 187.7 F/g) at the current density of 0.5 mA/cm2 in 1 M NaSO4 aqueous solution. Additionally, the most favorable composites ratio MnO2-10-600 s@PFG composite materials exhibited highest energy density of 61.01 mW h/cm2, a maximum power density of 1249.78 mW/cm2, excellent capacitance retention with no more than 7% capacitance loss after 10000 cycles and good mechanical flexibility (about 91.06% of its original capacitance after 500 bending times). By combination of electric double layer capacitance of graphene network with the pseudocapacitance of MnO2 nanostructures, the flexible electrode showed the much enhanced electrochemical capacitance behaviors with robust tolerance to mechanical deformation, prosing for being woven into a textile for wearable electronics.

Design and synthesis of MnO2@paper fiber/graphene ternary composite for high performance electrochemical electrodes

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.