MnMoS4 anchored at carbon nanofiber as a flexible electrode for solid-state asymmetric supercapacitor device

In this investigation, self-standing core-shell manganese molybdenum sulfide/carbon nanofiber (MnMoS4@CNF) hybrid mats were fabricated and evaluated their electrochemical properties for flexible supercapacitor applications. At first, free-standing hybrid mats were prepared via electrospinning of polyacrylonitrile/Mn(acac)(2)/ MoO2(acac)(2) blend precursor solution followed by thermal stabilization and carbonization in an inert atmosphere. As-prepared Mn-Mo encapsulated CNF mat was then treated with thioacetamide using a solvothermal process to produce nanostructured MnMoS4-decorated CNF hybrid mat. This way the developed hybrid mats yielded specific capacitance of 1727.9 F g(-1) at 1 A g(-1) and nearly 84% of capacity retention at 10 A g(-1) after 6000 cycles in 2 electrode symmetrical cell configuration with an aqueous electrolyte (3 M KOH). Given this merit, MnMoS4@CNF and pure CNF were employed as a positive and negative binder-free electrode in a solid-state asymmetry supercapacitor (ASC) device with PVA-KOH based solid gel polymer electrolyte. This exhibited outstanding electrochemical properties of energy density 73.7 Wh Kg(-1) at power density of 800 W kg(- 1 )and good cycling stability (88.3% after 6000 cycles). Thus, the nanostructured MnMoS4-decorated CNF hybrid mat with excellent electrochemical properties could be useful for fabrication of next-generation solid-state supercapacitors.

Automated summary

In this study, self-standing core-shell manganese molybdenum sulfide/carbon nanofiber (MnMoS4@CNF) hybrid mats were fabricated and evaluated for flexible supercapacitor applications. The hybrid mats exhibited specific capacitance of 1727.9 F g(-1) and good cycling stability. When used as electrode materials in a solid-state asymmetry supercapacitor (ASC) device, the nanostructured MnMoS4-decorated CNF hybrid mat showed outstanding electrochemical properties of energy density 73.7 Wh Kg(-1) and good cycling stability (88.3% after 6000 cycles). Therefore, the hybrid mat has potential for the fabrication of next-generation solid-state supercapacitors.