Rational Design of Core-Shell Mn-V MOF Nanostructures with Improved Charge Storage Performance

In this study, we synthesized a series of bimetallic Mn_xV_y-based metal organic frameworks directly on nickel foam (NF) substrates via an in situ hydrothermal interfacial growth method. By systematically varying the Mn:V ratio, we optimized the interactions between the two metals, thereby enhancing the electrochemical properties of the resulting electrode materials. Among the prepared materials, the M₁V₃/NF electrode showed the best capacitance (1826.4 F/g @ 1 A/g) due to its core-shell morphology, with superior rate performance, low internal resistance, and outstanding cycling stability (88% capacitance retention after 10,000 cycles). Furthermore, the assembled asymmetric hybrid supercapacitor device with M₁V₃/NF and activated carbon/NF electrodes in a coin-cell configuration delivered an energy density of 77.62 Wh/kg at 175 W/kg and showed reliable cycling performance. Thus, the proposed synthesis approach is a feasible route for designing advanced binary or ternary metal-based hybrid nanostructures with enhanced storage characteristics.