Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 3, Issue 8, Pages 3058-3063Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am200564b
Keywords
titanium nitride-vanadium nitride; fibers; core-shell structures; electrospinning; mesoporous structure; supercapacitor; oxidation
Funding
- Chinese Academy of Sciences
- National Program on Key Basic Research Project of China (973 Program) [MOST2011CB935700]
- Shandong Province Fund for Distinguished Young Scientist [BS2009NJ013]
- National Natural Science Foundation of China [20971077, 20901044, 20802039, 20902052]
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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.
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