High‐Performance Mo‐CoS2 Nanoplates Derived from Metal‐Organic Frameworks for Asymmetric Supercapacitor Applications

As global energy and environmental challenges intensify, advancing renewable energy storage technologies is critical. Supercapacitors, known for their rapid charge-discharge rates and exceptional cycling stability, are a promising solution; however, they are constrained by their comparatively low energy density. This study addresses this limitation by developing high-performance Mo-CoS₂ nanoplates derived from metal-organic frameworks for asymmetric supercapacitor applications. Using ZIF-67 nanoplates as precursors, Mo-CoS₂ hybrids were synthesized through a two-step process that included carbonization followed by sulfurization. The Mo-CoS₂ hybrids maintained its plate-like morphology with plentiful active sites, which are crucial for superior electrochemical performance. The Mo-CoS₂ electrode delivers a specific capacitance of 1382.6 F g^-1 at 0.5 A g^-1, significantly surpassing that of CoS₂ and MoS₂ alone. An asymmetric supercapacitor incorporating Mo-CoS₂ and ZIF-67-derived carbon electrodes demonstrate a remarkable energy density of 49.4 Wh kg^-1 at a power density of 703 W kg^-1, while retaining 72.09% of their initial performance after 10 000 cycles. The findings underscore the potential of materials derived from metal-organic frameworks (MOFs) in enhancing supercapacitor technology, as they offer a combination of high capacitance and long-term stability.