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Issue 40, 2018

Ni foam supported NiO nanosheets as high-performance free-standing electrodes for hybrid supercapacitors and Ni–Zn batteries

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Abstract

Herein, Ni foam (NF) supported NiO nanosheets with a NF@NiO core@shell structure have been synthesized by a facile etching-reoxidation method. The obtained NF@NiO can function as high-performance free-standing electrodes for both hybrid supercapacitors and Ni–Zn batteries. When employed as the cathode for hybrid supercapacitors, the NF@NiO exhibits a high areal capacitance of 2.01 F cm−2 at 8 mA cm−2. By coupling with an FeOOH anode, the assembled NF@NiO//FeOOH asymmetric supercapacitor delivers a peak energy density of 2.15 mW h cm−3 and a peak power density of 2.75 W cm−3. A rechargeable Ni–Zn battery is also assembled using NF@NiO as the cathode. The NF@NiO//Zn battery demonstrates a high maximum energy density (25.6 μW h cm−2) and an impressive power density (86.48 mW cm−2) with remarkable cycling durability (84.7% capacity retention for 10 000 cycles). These features make the free-standing NF@NiO a promising candidate for electrochemical energy storage.

Graphical abstract: Ni foam supported NiO nanosheets as high-performance free-standing electrodes for hybrid supercapacitors and Ni–Zn batteries

Supplementary files

Article information


Submitted
04 Aug 2018
Accepted
12 Sep 2018
First published
14 Sep 2018

J. Mater. Chem. A, 2018,6, 19488-19494
Article type
Paper

Ni foam supported NiO nanosheets as high-performance free-standing electrodes for hybrid supercapacitors and Ni–Zn batteries

Q. Chen, J. Li, C. Liao, G. Hu, Y. Fu, O. K. Asare, S. Shi, Z. Liu, L. Zhou and L. Mai, J. Mater. Chem. A, 2018, 6, 19488 DOI: 10.1039/C8TA07574C

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