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Mesoporous Coaxial Titanium Nitride-Vanadium Nitride Fibers of Core–shell Structures for High-Performance Supercapacitors

2011; American Chemical Society; Volume: 3; Issue: 8 Linguagem: Inglês

10.1021/am200564b

1944-8252

Xinhong Zhou, Chaoqun Shang, Lin Gu, Shanmu Dong, Xiaohong Chen, Pengxian Han, Lanfeng Li, Jianhua Yao, Zhihong Liu, Hongxia Xu, Yuwei Zhu, Guanglei Cui,

MXene and MAX Phase Materials

In this study, titanium nitride-vanadium nitride fibers of core-shell structures were prepared by the coaxial electrospinning, and subsequently annealed in the ammonia for supercapacitor applications. These core-shell (TiN-VN) fibers incorporated mesoporous structure into high electronic conducting transition nitride hybrids, which combined higher specific capacitance of VN and better rate capability of TiN. These hybrids exhibited higher specific capacitance (2 mV s(-1), 247.5 F g(-1)) and better rate capability (50 mV s(-1), 160.8 F g(-1)), which promise a good candidate for high-performance supercapacitors. It was also revealed by electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS) characterization that the minor capacitance fade originated from the surface oxidation of VN and TiN.