Centrifugal spinning and characterization of CO3O4 coated carbon fibers

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Centrifugally spun polyacrylonitrile (PAN) microfibers surface-coated with Co3O4 nanoparticles (NPs) were prepared as precursors to produce coated Co3O4 carbon-composite fibers. The Co3O4/C composite fibers were obtained through a staged heating process during which the Co3O4PAN precursor fibers were stabilized over four hours at 200 °C, and subsequently the stabilized fibers were carbonized for six hours at 600 °C. The synthesis process presented in this work provides an effective strategy for the fabrication of surface coated-fiber materials, including composite fibers with good structure and morphology. The characterization of the Co3O4/C composite fibers was performed using SEM, EDS, XPS, XRD and BET. The SEM data indicated the fibers were micron-sized in diameter with a non-homogenous distribution of the Co3O4 NPs on both the Co3O4-PAN and the CO3O4-Carbon composite fibers. The EDS mapping of the cobalt showed it to be distributed throughout the samples on the surface, but areas of high concentrations of particles were observed. The powder XRD data showed a reduction of the Co(III)/Co(II) starting material into a combination of Co-metal and CoO. The XRD results were confirmed by the Co 2P XPS data, which showed a change from the pure Co3O4 NPs to a combination of Co(III), Co(II) and Co-metal. In addition, the binding of the Co3O4 nanoparticles to the PAN fibers before carbonization showed a change in the chemical environment, which included attachment through an N ligand on the fibers.


© 2021 Published by Elsevier B.V.

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Nano-Structures & Nano-Objects