Fabrication of Hierarchical MOF-Derived NiCo(2)S(4)@Mo-Doped Co-LDH Arrays for High-Energy-Density Asymmetric Supercapacitors

The rational fabrication of composite structures made of mixed components has shown great potential for boosting the energy density of supercapacitors. Herein, an elaborate hierarchical MOF-derived NiCo(2)S(4)@Mo-doped Co-LDH arrays hybrid electrode was fabricated through a step-wise method. By leveraging the synergistic effects of a uniform array of NiCo(2)S(4) nanowires as the core and an MOF-derived porous shell, the NiCo(2)S(4)@Mo-doped Co-LDH hybrid electrode demonstrates an exceptional specific capacitance of 3049.3 F g(−1) at 1 A g(−1). Even at a higher current density of 20 A g(−1), the capacitance remains high at 2458.8 F g(−1). Moreover, the electrode exhibits remarkable cycling stability, with 91% of the initial capacitance maintained after 10,000 cycles at 10 A g(−1). Additionally, the as-fabricated asymmetric supercapacitor (ASC) based on the NiCo(2)S(4)@Mo-doped Co-LDH electrode achieves an impressive energy density of 97.5 Wh kg(−1) at a power density of 835.6 W kg(−1). These findings provide a promising approach for the development of hybrid-structured electrodes, enabling the realization of high-energy-density asymmetric supercapacitors.