Three-dimensional ultrathin Ni(OH)2 nanosheets grown on nickel foam for high-performance supercapacitors

Abstract

In this paper, we report the growth of ultrathin Ni(OH) 2 nanosheets on nickel foam at room temperature via a cost-effective and simple process, oxidizing fresh nickel foam in a wet environment followed by a morphology transformation in a mixed alkaline and oxidative solution without the need for any additional nickel sources, templates, or surfactant. When tested as electrode for a supercapacitor, the Ni(OH) 2 nanosheets grown on nickel foam displayed excellent performance, demonstrating specific capacitance of 2384.3 F g-1 at a charge and discharge current density of 1 A g-1 and 1288.1 F g-1 at 5 A g-1 with a good cycling ability (~75% of the initial specific capacitance remained after 3000 cycles). The excellent electrochemical performance is attributed to its unique nanostructures, which may facilitate rapid ion transport near electrode surfaces, while allowing facile redox reactions associated with charge storage by the nanosheets. The demonstrated high specific capacity and the remarkable rate performance of the Ni(OH) 2 nanosheets, together with the flexibility of the nickel foam substrate, make the three-dimensional nanostructured electrodes ideally suited for low-cost, high-performance supercapacitor applications.

Few-layered Ni(OH)2 nanosheets for high-performance supercapacitors

“…The present specific capacitance and especially the rate capability are highly improved compared to many metal oxide/hydroxide electrodes reported in literature [7,9e11,13,16,30]. The performance of the Ni(OH) 2 nanosheets is comparable to and even better than those with Ni(OH) 2 nanostructures directly deposited on the conductive substrates [15,17,22,31]. Zhu et al [18] prepared Ni(OH) 2 nanosheets via microwave-assisted liquid-phase growth, and the Ni(OH) 2 nanosheets delivered high capacitances of 3650 and 2680 F g À1 at 2 and 16 A g À1 , respectively.…”

A Nickel‐Based Integrated Electrode from an Autologous Growth Strategy for Highly Efficient Water Oxidation

“…Herein, growth of metal hydroxides on metal surfaces by controlled surface oxidation was explored to create an integrated electrode with autologous catalyst-support feature for electrocatalysis. [ 46 ] By using Ni substrate, the resulted electrode has a uniform coverage of dense Ni(OH) 2 . Subsequent incorporation of Fe gave a Ni-Fe catalyst.…”

In situ preparation of NiO nanoflakes on Ni foams for high performance supercapacitors

“…In the Raman spectrum (Fig. 2b) of the composite coatings, the bands at 527.5 cm À 1 and 1064.0 cm À 1 are induced by the transverse and longitudinal scattering of the different phonons of NiO molecule, and the band at 1490.5 cm À 1 is induced by the twomagnon scattering of NiO [12]. The XPS surveys spectrum (Fig.…”