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
Applied Surface Science – Elsevier
Published: Jan 1, 2018
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