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

Abstract

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.