Battery-Type Mnco2o4@Carbon Nanofibers Composites With Mesoporous Structure For High Performance Asymmetric Supercapacitor

MnCo2O4@nitrogen-doped carbon nanofibers (MnCo2O4@N-CNFs) composites with mesopore-rich structure are synthesized by in-situ electrospinning method for asymmetric supercapacitor (ASC). Among the composites studied, the MnCo2O4@N-CNFs-0.5 electrode with Mn:Co molar ratio of 0.5:1 exhibits a high specific capacitance of 548C g(-1) at 0.5 A g(-1), which is attributed to the uniform dispersion of MnCo2O4 nanoparticles on the surface of N-CNFs and also the mesopore-rich structure of the composite. After being assembled into an alkaline ASC with MnCo2O4@N-CNFs-0.5 as cathode and activated carbon as anode, it shows a high energy density of 27.5 W h kg(-1) at 886 W kg(-1) and obtains 76.9% of capacitance retention after 8000 cycles at 2 A g(-1). Reasonable regulation of the loading of MnCo2O4 to N-CNFs can pave the way for the preparation of composite materials with significantly improved electrochemical performance.