Construction of metal-organic framework-derived CeO2/C integrated MoS2 hybrid for high-performance asymmetric supercapacitor
Metal-organic framework (MOF)-derived hybrids are promising electrode materials in electrochemical energy storage , owing to their high surface area that offers enormous redox sites and excellent conductivity. In this work, MOF-derived cerium oxide/carbon integrated with molybdenum disulfide (CeO 2 /C/MoS 2 ) hybrid is developed as an electrode material for supercapacitor . Remarkably, integration of CeO 2 /C with small amount of MoS 2 has considerably enhanced the electrochemical performance. Moreover, CeO 2 /C/MoS 2 hybrid exhibited both surface and diffusion-controlled mechanism towards charge storage. The CeO 2 /C/MoS 2 hybrid showed an outstanding specific capacitance (specific capacity) of 1325.67 F g −1 (397.70 C g −1 ) and excellent cyclic stability with capacitance retention of 92.8% after 1000 charging-discharging cycles, which is significantly higher than that of CeO 2 /C (727.49 F g −1 ) or else that of MoS 2 (300.33 F g −1 ) at 1 A g −1 . In addition, asymmetric supercapacitor (ASC) fabricated with CeO 2 /C/MoS 2 hybrid and activated carbon (AC) showed remarkable electrochemical performance with high specific capacitance (110.55 F g −1 ), excellent cyclic stability (even after 1000 cycles) and high energy density of 34.55 Wh kg −1 at a power density of 666.7 W kg −1 . Thus, MOF derived CeO 2 /C integrated MoS 2 hybrid is a potential electrode material for the ASCs.
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