Co3O4composite nano-fibers doped with Mn4+prepared by the electro-spinning method and their electrochemical properties

Abstract

In this work, based on the electrospinning method, pure Co3O4, pure MnO2, and Co3O4composite nano-fiber materials doped with different ratios of Mn4+were prepared. XRD, XPS, BET and SEM tests were used to characterize the composition, structure and morphology of the materials. An electrochemical workstation was used to test the electrochemical performance of the materials. The results showed that the material properties had greatly improved on doping Mn4+in Co3O4nano-fibers. The relationship between the amount of Mn4+doped in the Co3O4composite nano-fiber material and its electrochemical performance was also tested and is discussed in this report. The results show that whennCo : nMn= 20 : 2, the Co3O4composite nano-fiber material had a specific surface area of 68 m2g−1. Under the current density of 1 A g−1, the 20 : 2 sample had the maximum capacitance of 585 F g−1, which was obviously larger than that of pure Co3O4nano-fibers (416 F g−1). After 2000 cycles of charging/discharging, the specific capacitance of the 20 : 2 sample was 85.9%, while that of the pure Co3O4nano-fiber material was only 76.4%. The mechanism of performance improvement in the composite fibers was analyzed, which demonstrated concrete results.