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- Title
Preparation and performance of rose stalk-like niobium nitride nanofibers for supercapacitor.
- Authors
Xu, Kaizheng; Cui, Shuai; Liu, Suyun; Lv, Dongfeng; Hu, Shilei; Cui, Yi; Chen, Yuejun; Wei, Yingna; Wei, Hengyong
- 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.
- Subjects
NIOBIUM nitride; NANOFIBERS; ROSES; ENERGY density; POWER density; SOLID solutions
- Publication
Journal of Materials Science: Materials in Electronics, 2022, Vol 33, Issue 27, p21384
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-022-08931-1