Self-template synthesis of yolk-shelled NiCo2O4 spheres for enhanced hybrid supercapacitors

Self-template synthesis of yolk-shelled NiCo2O4 spheres for enhanced hybrid supercapacitors Article history: A self-template method is developed for hierarchically yolk-shelled NiCo O spheres (YS-NiCo O ) 2 4 2 4 Received 10 May 2017 through a controlled hydrolysis process and followed by a thermal annealing treatment. The yolk- Received in revised form 20 July 2017 shelled NiCo O spheres possess out-shell consisting of hundreds of ultrathin sheets with 3–5 nm in 2 4 Accepted 24 July 2017 thickness and solid yolk composing of a large number of nanoparticles. The YS-NiCo O generates a 2 4 Available online 3 August 2017 2 −1 large specific surface area of 169.6 m g . Benefit from the large specific surface area and rich oxygen vacancy, the as-fabricated YS-NiCo O as electrode materials for supercapacitor exhibits high specific 2 4 Keywords: −1 −1 capacitance of 835.7 F g at 0.5 A g , an enhanced rate capability and excellent electrochemical stability Yolk-shelled spheres −1 with 93% retention after 10,000 cycles even at 10 A g . Moreover, a hybrid supercapacitor combined NiCo O 2 4 −1 with YS-NiCo O and graphene shows a high energy density of 34.7 Wh kg at the power density of 2 4 Self-template synthesis −1 −1 −1 395.0 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Applied Surface Science Elsevier

Self-template synthesis of yolk-shelled NiCo2O4 spheres for enhanced hybrid supercapacitors

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Publisher
Elsevier
Copyright
Copyright © 2017 Elsevier B.V.
ISSN
0169-4332
eISSN
1873-5584
D.O.I.
10.1016/j.apsusc.2017.07.221
Publisher site
See Article on Publisher Site

Abstract

Article history: A self-template method is developed for hierarchically yolk-shelled NiCo O spheres (YS-NiCo O ) 2 4 2 4 Received 10 May 2017 through a controlled hydrolysis process and followed by a thermal annealing treatment. The yolk- Received in revised form 20 July 2017 shelled NiCo O spheres possess out-shell consisting of hundreds of ultrathin sheets with 3–5 nm in 2 4 Accepted 24 July 2017 thickness and solid yolk composing of a large number of nanoparticles. The YS-NiCo O generates a 2 4 Available online 3 August 2017 2 −1 large specific surface area of 169.6 m g . Benefit from the large specific surface area and rich oxygen vacancy, the as-fabricated YS-NiCo O as electrode materials for supercapacitor exhibits high specific 2 4 Keywords: −1 −1 capacitance of 835.7 F g at 0.5 A g , an enhanced rate capability and excellent electrochemical stability Yolk-shelled spheres −1 with 93% retention after 10,000 cycles even at 10 A g . Moreover, a hybrid supercapacitor combined NiCo O 2 4 −1 with YS-NiCo O and graphene shows a high energy density of 34.7 Wh kg at the power density of 2 4 Self-template synthesis −1 −1 −1 395.0

Journal

Applied Surface ScienceElsevier

Published: Jan 1, 2018

References

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