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Sulphur Source-Inspired Self-Grown 3D NiₓSy Nanostructures and Their Electrochemical Supercapacitors

Shinde, Nanasaheb M., Xia, Qi Xun, Shinde, Pritamkumar V., Yun, Je Moon, Mane, Rajaram S., Kim, Kwang Ho
ACS applied materials & interfaces 2019 v.11 no.4 pp. 4551-4559
buds, corolla, electrochemistry, electrodes, electrolytes, energy density, foams, hot water treatment, light emitting diodes, nanomaterials, nickel, porous media, potassium hydroxide, research and development, research institutions, sulfur, temperature
Sulphur source-inspired self-grown polycrystalline and mesoporous nickel sulfide (NiₓSy) superstructures with vertically aligned nanomorphologies viz. rods, flakes, buds, and petals, synthesized at elevated temperatures and moderate pressures by a facile one-pot hydrothermal method on a three-dimensional Ni foam demonstrate remarkable areal specific capacitances of 7152, 4835, and 2160 F cm–² at current densities of 1, 2, and 5 mA cm–², respectively, with a cycling stability of 94% for a battery-type electrochemical supercapacitor when used as an electrode material in a supercapacitor. The NiₓSy//Bi₂O₃ asymmetric supercapacitor assembly exhibits an energy density of 41 W h·kg–¹ at a power density of 1399 W kg–¹ for 1 A g–¹ and was used in a three-cell series combination to operate a “GFHIM” display panel (our research institute name, Global Frontier R & D Center for Hybrid Interface Materials) composed of nearly 50 differently colored light-emitting diodes with high intensity in 1 M KOH water-alkali electrolyte. The electrochemical supercapacitor results obtained for the NiₓSy superstructures because of a combination of catalytically active amorphous and high mobility polycrystalline are highly comparable to those reported previously for salt-mediated and self-grown NiₓSy structures and morphologies.