Abstract
Rose stalk-like Nb4N5 fibers were prepared by electrospinning, solvothermal method and ammonia reduction technology. The composition and morphology were characterized. The results showed that the corresponding XRD (X-ray diffractometer) pattern of the sample was indexed to tetragonal Nb4N5, and it existed as NbNxO1−x solid solution, in which Nb ions exist in the form of + 3 and + 5. The abundant valence states made Nb ions undergo reversible proton insertion/chemical adsorption in the conductive channels of the Nb4N5 nanofibers. The Nb4N5 nanofibers presented a rose stalk-like structure, and thus its specific surface area was high to 76.42 m2 g−1 with pore diameter of 13.2 nm. The specific capacitance of the Nb4N5||Nb4N5 symmetric supercapacitor device reached to 139.03 F g−1 at the current density of 10 mA g−1. When the energy density was 12.60 Wh kg−1, the power density of the supercapacitors was 2.16 kW kg−1. It was indicated that the rose stalk-like structure gave the Nb4N5 nanofibers a larger contact area which was conducive to the construction of a conductive network, and thus the electron transmission rate was improved, thereby improving the electrochemical performance of the Nb4N5 fibers electrode materials for supercapacitors.
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This work was financially supported by the Hebei Natural Science Foundation (Grant Numbers E2021209120).
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KX: Conceptualization, Synthesis, Performance testing, Writing-original draft. SC: Synthesis, Performance testing, Writing—review. SL: Investigation, Methodology, Synthesis. DL: Conceptualization, Writing- original draft & review & editing. SH: Synthesis, Investigation. YC: Resources, Formal analysis. YC: Methodology, Performance testing. YW: Resources, Formal analysis. HW: Idea and design of this research, Writing- original draft & review & editing.
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Xu, K., Cui, S., Liu, S. et al. Preparation and performance of rose stalk-like niobium nitride nanofibers for supercapacitor. J Mater Sci: Mater Electron 33, 21384–21395 (2022). https://doi.org/10.1007/s10854-022-08931-1
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DOI: https://doi.org/10.1007/s10854-022-08931-1