Electrospun deposited Mn2O3/GO nanofiber composite electrode for hybrid coin cell supercapacitor devices

In this study, the nanocomposite of manganese oxide (Mn 2 O 3 )/graphene oxide (GO) is deposited on a current collector using the single-nozzle electrospinning method. The effects of the GO concentration (volume %) of the Mn 2 O 3 nanofibers (NFs) on the structural, morphological, and electrochemical properties are investigated systematically. The presence of GO in the Mn 2 O 3 NF samples is confirmed using X-ray diffraction patterns, Raman spectroscopy, and X-ray photoelectron spectroscopy, where sp 2 hybridization can be observed. The influence of the GO (volume %) in the Mn 2 O 3 NF samples on the contribution of the capacitive and diffusion-controlled process has been calculated mathematically. GO at 5 vol% in the Mn 2 O 3 sample exhibited a high specific capacitance of 588 Fg −1 at a current density of 0.5 mAcm −2 (2.5 Ag −1 ) in 1 M aqueous electrolyte with 98% cyclic stability up to 1000 cycles. Furthermore, a coin cell hybrid device was assembled using Mn 2 O 3 /GO and a Li-chip as an electrode, 1 M LiPF 6 as an electrolyte, and a polypropylene sheet as a separator. This device exhibited a capacitance, an energy density, and a power density of 0.33 F (specific capacitance of 740 Fg −1 ), 925 Whkg −1 , and 3.3 kWkg −1 , respectively at a current density of 1 mAcm −2 (2.5 Ag −1 ) along with 90% retention in capacitance measured till 5000 cycles.