Issue 39, 2016

Ni@NiO core/shell dendrites for ultra-long cycle life electrochemical energy storage

Abstract

A dendritic Ni@NiO core/shell electrode (DNE) is successfully fabricated by electrodeposition in a Ni-free electrolyte, with a Ni anode providing Ni ions through dissolution and diffusion. The unique structure is ideal for electrochemical energy storage since the dendrites provide a large surface area for easy electrolyte infiltration; the metal core improves the electrode conductivity with a shortened ion diffusion path, and the metal oxide shell is active for faradaic charge storage. As a result, the synthesized DNE demonstrates a high specific capacitance of 1930 F g−1 and a high areal capacitance of 1.35 F cm−2, with super-long cycle stability. The gravimetric capacitance of the DNE hardly shows any decay after 70 000 cycles at a scan rate of 100 mV s−1. It was also demonstrated that our electrodeposition method in a source-free electrolyte is universal to deposit dendritic Ni-compounds on many other types of substrates, versatile for different applications.

Graphical abstract: Ni@NiO core/shell dendrites for ultra-long cycle life electrochemical energy storage

Supplementary files

Article information

Article type
Paper
Submitted
01 Jul 2016
Accepted
22 Aug 2016
First published
22 Aug 2016
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. A, 2016,4, 15049-15056

Ni@NiO core/shell dendrites for ultra-long cycle life electrochemical energy storage

Y. Liu, N. Fu, G. Zhang, W. Lu, L. Zhou and H. Huang, J. Mater. Chem. A, 2016, 4, 15049 DOI: 10.1039/C6TA05508G

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