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Towards a high energy density asymmetric supercapattery: binary metal MOF-derived Co–Mn/rGO as cathode materials

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2025, 35(4), pp.1741~1754
  • DOI : 10.1007/s42823-025-00895-6
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : April 5, 2025
  • Accepted : March 13, 2025
  • Published : December 11, 2025

Zhang Wenlei 1 Hao Shengcai 2 Sun Bo 3 Wu Honglu 4

1College of Electrical Engineering, Chuzhou Polytechnic
2Beijing Academy of Science and Technology
3Central University of Finance and Economics
4Tsinghua University

Accredited

ABSTRACT

It is addressed that the challenges of poor cyclic stability and low conductivity in metal–organic frameworks (MOFs) hinder their application in energy storage. Here, we synthesized binary metal MOFs through a one-step hydrothermal process, subsequently calcined to produce Co–Mn/reduced graphene oxide (rGO). This approach not only carbonized the organic framework but also enhanced its electrical conductivity and stability. Our findings demonstrated that the synergistic effects of Co and Mn within the assembled electrode resulted in remarkable performance, achieving a specific capacitance of 3558.65 F g−1 at 1 A g−1 and a rate capability of 1000 F g−1 at 30 A g−1. The Co–Mn/rGO anode in the asymmetric supercapattery exhibited a broadened operating potential window of 1.5 V, delivering an energy density of 54.65 W h kg−1 at a power density of 125 W kg−1, and maintaining 11.375 W h kg−1 at a high power density of 12,500 W kg−1. Notably, the capacitance retention rate reached 99.99% after 10,000 cycles at a current density of 10 A g−1. These results suggest that the developed Co–Mn/rGO composite represents a promising candidate for advanced energy storage systems, offering both high performance and stability.

Citation status

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