Journal
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
Volume 33, Issue 11, Pages 8844-8857Publisher
SPRINGER
DOI: 10.1007/s10854-021-06920-4
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Funding
- National Research Foundation of Korea [NRF-2020R1A2C1015206]
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In this study, Mn2O3/GO nanocomposite was prepared using electrospinning method and the influence of GO concentration on its performance was investigated. The results showed that the Mn2O3 sample with 5% GO exhibited high specific capacitance and cyclic stability in 1M aqueous electrolyte. By assembling the coin cell hybrid device, excellent capacitance, energy density, and power density were demonstrated.
In this study, the nanocomposite of manganese oxide (Mn2O3)/graphene oxide (GO) is deposited on a current collector using the single-nozzle electrospinning method. The effects of the GO concentration (volume %) of the Mn2O3 nanofibers (NFs) on the structural, morphological, and electrochemical properties are investigated systematically. The presence of GO in the Mn2O3 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 Mn2O3 NF samples on the contribution of the capacitive and diffusion-controlled process has been calculated mathematically. GO at 5 vol% in the Mn2O3 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 LiPF6 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.
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