Selectively designed hierarchical copper-cobalt oxysulfide nanoarchitectures for high-rate hybrid supercapacitors

Abstract

The invention discloses a method of fabricating a copper-cobalt (Cu-Co) oxysulfide nanoarchitecture, the method comprising dissolving cobalt nitrate hexahydrate and copper nitrate in de-ionized (DI) water forming a growth solution, mixing disodium thiosulfate and urea to the formed growth solution, immersing a pre-cleaned Ni-foam substrate in the growth solution forming a total solution and transferring the total solution to a sealed glass bottle. The method further comprises heating the sealed glass bottle in an oil bath, thereby forming a flower-like morphology sample of copper-cobalt oxysulfide and cleaning and drying the formed sample of copper-cobalt oxysulfide. Also disclosed is a hybrid supercapacitor (HSC) comprising copper-cobalt (Cu-Co) oxysulfide nanosheets (NFs) on Ni foam as positive electrode; and copper-cobalt (Cu-Co) oxysulfide nanosheets (NFs) on porous carbon as negative electrode. (Fig. 1)

Claims

Claim 1. A method of fabricating a copper-cobalt (Cu-Co) oxysulfide nanoarchitecture, the method comprising the steps of: dissolving cobalt nitrate hexahydrate and copper nitrate in de-ionized (DI) water forming a growth solution; mixing disodium thiosulfate and urea to the formed growth solution; immersing a pre-cleaned Ni-foam substrate in the growth solution forming a total solution; and transferring the total solution to a sealed glass bottle. Claim 2. The method of claim 1, further comprising the steps of: heating the sealed glass bottle in an oil bath, thereby forming a flower-like morphology sample of copper-cobalt oxysulfide; and cleaning and drying the formed sample of copper-cobalt oxysulfide. Claim 3. The method of claim 2, wherein the formed sample of copper-cobalt oxysulfide is cleaned using de-ionized water and ethanol. Claim 4. The method of claim 1, wherein 67mM of cobalt nitrate hexahydrate and 33 mM of copper nitrate are dissolved in 50 ml of de-ionized (DI) water. Claim 5. The method of claim 1, wherein 300 mM of disodium thiosulfate and 100 mM of urea is mixed into the formed growth solution. Claim 6. The method of claim 1, wherein the Ni-foam substrate is pre-cleaned to eliminate oxide species on the Ni-foam substrate. Claim 7. The method of claim 2, wherein the sealed glass bottle is heated at 70 o C for 3 hours. Claim 8. The method of claim 2, wherein the formed sample of copper-cobalt oxysulfide is dried at 60 o C for 4 hours.

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