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In Situ Growth of 3D Nano‐array Ni 0.85 Se/NF Structure Supercapattery Electrode with Excellent Cyclic Stability and Superior Energy Density
Author(s) -
An Weidan,
Gao Yanfang,
Liu Jinrong
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201700650
Subject(s) - supercapacitor , capacitance , materials science , electrode , current density , selenide , power density , nano , nanotechnology , chemical engineering , optoelectronics , analytical chemistry (journal) , composite material , chemistry , metallurgy , chromatography , power (physics) , physics , selenium , quantum mechanics , engineering
The growth of three‐dimensional(3D) nano‐array Ni 0.85 Se structure on Ni foam (Ni 0.85 Se/NF) in situ by hydrothermal treatment using Na 2 SeO 3 ⋅5H 2 O as Se source is presented in this article. Moreover, when fabricated as binder‐free supercapattery electrode, the 3D nano‐array Ni 0.85 Se/NF structure demonstrates an excellent specific capacitance of 1344 and 686.50 F⋅g −1 at current densities of 0.5 and 5 A⋅g −1 , which was calculated by 4 mg active mass of Ni 0.85 Se. Impressively, the areal capacitance of 5.38 and 2.75 F⋅cm −2 can be got at the current densities of 2 and 20 mA⋅cm −2 . Furthermore, the supercapattery electrode exhibits a superior cyclic stability with 70.1 % capacity retention after 5000 cycles, which is notable for a selenide based supercapacitor. When assembled into Ni0.85Se//AC asymmetric supercapacitor, the operating voltage was expanded to 1.6 V, a good specific capacitance of 184.70 C⋅g −1 at 0.5 A⋅g −1 and remains 35.33 C⋅g −1 at 4 A⋅g −1 is achieved. The supercapattery electrode demonstrates an outstanding rate performance as a coin type asymmetric device, obtaining a great energy density of 38.48 Wh⋅kg −1 at the power density of 375 W⋅kg −1 . The aforementioned results suggested that the 3D nano‐array Ni 0.85 Se structure may a potential electrode for next generation supercapacitors.