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.

Towards a high energy density asymmetric supercapattery: binary metal MOF-derived Co–MnrGO as cathode materials
    Abstract
    1 Introduction
    2 Experimental section
        2.1 Materials
        2.2 Preparation of rGO
        2.3 Preparation of Co–MnrGO, CorGO, and MnrGO
    3 Characterization
        3.1 Morphological characterization
        3.2 Electrochemical characterization
    4 Result and discussion
        4.1 Morphology and electrochemical properties of Co–MnrGO
        4.2 Electrochemical properties of Co–MnrGO assembled electrode
        4.3 Electrochemical properties of 3D rGO aerogel anode
        4.4 Fabrication and electrochemical performances of Co–MnrGO3D rGO aerogel asymmetric supercapattery device
    5 Conclusion
    6 Supplementary information
    Acknowledgements 
    References

• Wenlei Zhang(College of Electrical Engineering, Chuzhou Polytechnic, Chuzhou 239000, China)
• Shengcai Hao(Beijing Academy of Science and Technology, Beijing 100089, China, Beijing Institute of Electro-Machining Co. Ltd., Beijing Key Laboratory of Electro Discharge Machining Technology, Beijing 100191, China)
• Bo Sun(School of Statistics and Mathematics, Central University of Finance and Economics, Beijing 100081, China)
• Honglu Wu(Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Haidian District, Beijing 100084, China) Corresponding author