4.4 Article

Hydrangea-like Mesoporous Carbon Architectures Embedded with MnOx Nanoparticles for Solid-State Asymmetric Supercapacitors with Enhanced Areal Capacitance

Journal

INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
Volume 15, Issue 7, Pages 6841-6851

Publisher

ESG
DOI: 10.20964/2020.07.57

Keywords

metal organic frameworks; mesoporous carbon; manganese oxide; binder-free electrodes; asymmetric supercapacitors

Funding

  1. National Key Research and Development Project [2018YFE0124800]
  2. Primary Research & Development Plan of Jiangsu Province [BE2016183]
  3. Natural Science Foundation of Jiangsu Province for Youth [BK20160960]
  4. 14th Six Talents Peak Project of Jiangsu Province [XNYQC-016]

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Hydrangea-like mesoporous carbon architectures embedded with MnOx nanoparticles (MnOx@C) are synthesized via the pyrolysis of Mn-MOFs (Mn-based metal organic frameworks) grwon on nickel foam as a binder-free electrode for asymmetric supercapacitors. The as-prepared MnOx@C featuring stacked carbon flakes with mesoporous structure and embedded with nanosized MnOx particles exhibit superior electrochemical performances with a specific areal capacitance of 1518 mF cm(-2) at a current density of 3 mA cm(-2). An asymmetric supercapacitor that is fabricated using MnOx@C as cathode and activated carbon as anode demonstrates remarkable areal power density of 12.2 W cm(-2), areal energy density of 169.4 mWh cm(-2) and excellent rate capability. This work provides a facile and effective strategy to construct MnOx@C supercapacitive materials so as to efficiently enhance electron transport at the meantime achieve rapid ion diffusion.

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