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Issue 5, 2015

A one-step, cost-effective green method to in situ fabricate Ni(OH)2 hexagonal platelets on Ni foam as binder-free supercapacitor electrode materials

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Abstract

Nickel hydroxide (Ni(OH)2) is considered to be a promising alternative to the expensive and toxic RuO2 electrode material for high-performance supercapacitors; however, the fabrication method and electrochemical performance of suitable Ni(OH)2 structures are unsatisfactory. In the present work, a facile, cost-effective green method is developed to in situ fabricate Ni(OH)2 hexagonal platelets on Ni foam as a binder-free supercapacitor electrode with high performance. The Ni(OH)2 hexagonal platelets are self-grown on three-dimensional (3D) Ni foam by a one-step hydrothermal treatment of Ni foam in a 15 wt% H2O2 aqueous solution without the use of nickel salts, acids, bases, or post-treatments. The as-prepared Ni(OH)2 hexagonal platelets-Ni foam (HNF) electrode can be used directly as a supercapacitor electrode material, thereby avoiding the need for binders and conducting agents. The Ni(OH)2 hexagonal platelets demonstrate high capacitance (2534 F g−1 at a scan rate of 1 mV s−1) and excellent cycling stability (97% capacitance retention after 2000 cycles at a scan rate of 50 mV s−1). The fabrication method developed here has the significant advantage of low-cost, facile, green, and additive-free processing, and it is therefore a promising route for preparing self-supported metal (hydr)oxide electrodes for high-performance supercapacitors and other energy-storage devices.

Graphical abstract: A one-step, cost-effective green method to in situ fabricate Ni(OH)2 hexagonal platelets on Ni foam as binder-free supercapacitor electrode materials

Supplementary files

Article information


Submitted
29 Sep 2014
Accepted
22 Oct 2014
First published
22 Oct 2014

J. Mater. Chem. A, 2015,3, 1953-1960
Article type
Paper

A one-step, cost-effective green method to in situ fabricate Ni(OH)2 hexagonal platelets on Ni foam as binder-free supercapacitor electrode materials

L. Li, J. Xu, J. Lei, J. Zhang, F. McLarnon, Z. Wei, N. Li and F. Pan, J. Mater. Chem. A, 2015, 3, 1953 DOI: 10.1039/C4TA05156D

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