Journal
JOURNAL OF ENERGY STORAGE
Volume 31, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2020.101607
Keywords
Amorphous nickel hydroxide; Interconnected nickel nanowire array; Close core-shell structure; Supercapacitor
Categories
Funding
- National Natural Science Foundation of China [51674183]
- CONACYT of Mexico [CB-296626, 511417]
- Fundamental Research Funds for the Central Universities [WUT: 2020IVA082]
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Amorphous Ni(OH)(2) closely coating on interconnected nickel nanowire arrays (Ni(OH)(2)@INWA) with rational architectures were prepared. The INWA with small wire diameter and high wire density acts both as miniature conductive scaffold and highly conductive core providing large surface area to load amorphous Ni(OH)(2) and ensuring high ionic/electronic conductivities. The amorphous Ni(OH)(2) nanosheets in-situ converted from the metallic surface of INWA are in seamless contact with the metallic core forming a close core-shell structure. Because of the material and architecture advantages, the amorphous Ni(OH)(2)@INWA presents enhanced electrochemical performance of ultrahigh specific capacitances of 3400 F g(-1) at a specific current of 5 A g(1), remarkable rate capability (3000 F g(-1) at 100 A g(-1)). The asymmetric supercapacitor of Ni(OH)(2)@INWA//reduced graphene oxide delivers a high specific energy of 53 Wh kg(1) at a specific power of 395 W kg(-1), and a specific energy of 31 Wh kg(-1) can be maintained at a specific power of 4973 W kg(-1). It also shows a long-term stability with 91 % retention of the initial capacitance after 10000 cycles at a specific current of 2 A g(-1).
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