Journal
ELECTROCHIMICA ACTA
Volume 330, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.135204
Keywords
Nitrogen doping; Nanotubes; Li-ion hybrid capacitors; Niobium pentoxide
Categories
Funding
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX19_2101]
- Natural Science Foundation of Shandong Province, China [ZR2017MEM019]
- Testing Center of Yangzhou University
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In recent years, hybrid supercapacitors (HSCs) with good characteristics of both lithium batteries (LIBs) and supercapacitors (SCs) have become a hot research topic to meet the growing market demand for electric and hybrid electric vehicles. The key for high-performance HSCs is the reaction kinetics imbalance between the slow faradaic intercalation anode and fast non-faradaic physical adsorption/desorption cathode. Herein, we simultaneously grow ultrafine Nb2O5 nanoparticles on the inner walls and outer surface of hollow heteroatomic (N) carbon tube, giving a unique hierarchical hybrid nanostructure materials named T-Nb2O5@NC. The LIB test show its excellent high-rate capability and long-term cyclic stability. At current density of 0.25C (1.0-3.0 V, vs Li/Li+), the reversible specific capacity of this material is up to 194 mAh g(-1). Importantly, the HSC device, assembled by T-Nb2O5@NC as anode and commercial activated carbon as cathode with an organic electrolyte, exhibits good electrochemical performance, including high energy density (49.7 Wh kg(-1)) and power density (8750 W kg(-1)), obviously superior to traditional HSC electrode materials. The results prove that T-Nb2O5@NC can be used as a promising HSC anode material. (C) 2019 Elsevier Ltd. All rights reserved.
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