Plasma‐Treated Basswood‐Loaded Manganese MOF Derived Porous Carbon Composites as Electrodes for Supercapacitors

Abstract The growing demand for advanced energy storage systems urgently requires the development of efficient, sustainable, and cost‐effective electrode materials. While supercapacitors offer high power density and long cycle life, their practical application is often constrained by complex synthesis processes and non‐renewable components. Biomass‐derived materials, though promising alternatives, generally suffer from limited active sites and poor ion transport capabilities. To overcome these bottlenecks, an innovative strategy is proposed: rapidly synthesizing linden‐based manganese metal–organic frameworks (Mn‐MOFs) at ambient temperature using dielectric barrier discharge (DBD) plasma within just 1 h. This method significantly reduces preparation time compared to conventional solvothermal approaches while enhancing interfacial integration between the MnO embedded in the carbon matrix and the hierarchical porous wood framework derived from the MOF. The resulting composite electrode achieves a high specific surface capacitance of 12 295 mF cm −2 at a current density of 5 mA cm −2 , along with outstanding rate performance (6700 mF cm −2 at 50 mA cm −2 ) and excellent cycling stability (91.9% capacity retention after 40 000 cycles). Symmetric supercapacitors assembled with this electrode achieved an energy density of 0.53 mWh cm −2 at a power density of 5000 mW cm −2 , demonstrating the synergistic effects of woody channels, carbon conductivity, and MnO pseudocapacitance.