Nickel foam-supported defective tricobalt tetroxide nanomaterial, low temperature resistant supercapacitor and preparation method thereof

Patent metadata

Field	Value
Publication number	US-12347618-B2
Application number	US-202117779235-A
Country	US
Kind code	B2
Filing date	Jan 14, 2021
Priority date	Jul 17, 2020
Publication date	Jul 1, 2025
Grant date	Jul 1, 2025

Abstract

The present invention relates to the field of electrode material of a low temperature resistant supercapacitor, and in particular to a nickel foam-supported defective tricobalt tetroxide nanomaterial, a low temperature resistant supercapacitor and a preparation method thereof. The method includes the following steps: dissolving cobalt acetate in an ethylene glycol solution and stirring uniformly to obtain a pink transparent solution; adding hexadecyl trimethyl ammonium bromide to the pink transparent solution, and stirring until the hexadecyl trimethyl ammonium bromide dissolves to obtain a mixed solution; putting the mixed solution into a teflon-lined reactor, adding pretreated nickel foam for hydrothermal reaction, taking out the nickel foam after the reaction is completed, and ultrasonic cleaning the nickel foam repeatedly before drying; and heat-treating the nickel foam obtained after drying. The defective tricobalt tetroxide (D-Co 3 O 4 ) grown on the nickel foam prepared by the present invention still has a high specific capacity at a low temperature, and the assembled supercapacitor can withstand low temperature, and thus has great application prospects.

First claim

The invention claimed is:

1. A method for preparing a nickel foam-supported defective tricobalt tetraoxide nanomaterial, comprising the following steps:
dissolving cobalt acetate in an ethylene glycol solution and stirring uniformly to obtain a pink transparent solution;
adding hexadecyl trimethyl ammonium bromide to the pink transparent solution, and stirring until the hexadecyl trimethyl ammonium bromide dissolves to obtain a mixed solution;
putting the mixed solution into a teflon-lined reactor, and adding pretreated nickel foam to the reactor for reaction, washing the nickel foam obtained after reaction repeatedly and then drying;
heat-treating the nickel foam composite material obtained after drying;
wherein the defective tricobalt tetraoxide has an increased d-spacing than non-defective cobalt tetraoxide, (311) diffraction peak of the defective tricobalt tetraoxide in XRD spectrum is moved to a lower angle than non-defective cobalt tetraoxide, and (311) characteristic peak of the defective tricobalt tetraoxide in XRD spectrum is broadened than non-defective cobalt tetraoxide.

2. The method for preparing a nickel foam-supported defective tricobalt tetraoxide nanomaterial according to claim 1 , wherein the step of pretreating the nickel foam comprises:
cutting the foam nickel into pieces, ultrasonic cleaning the pieces in hydrochloric acid, ethanol and an aqueous solution in sequence, and then drying them.

3. The method for preparing a nickel foam-supported defective tricobalt tetraoxide nanomaterial according to claim 2 , wherein a drying temperature in the step of pretreating the nickel foam is 60-80° C.

4. The method for preparing a nickel foam-supported defective tricobalt tetraoxide nanomaterial according to claim 3 , wherein a duration of the ultrasonic clean is 10-15 minutes.

5. The method for preparing a nickel foam-supported defective tricobalt tetraoxide nanomaterial according to claim 1 , wherein process conditions of the heat-treating are as follows: the temperature is 500-700° C., a heating rate is controlled at 2-5 min −1 , and a treatment time is 2-5 hours.

6. The method for preparing a nickel foam-supported defective tricobalt tetraoxide nanomaterial according to claim 1 , wherein a reaction temperature in the teflon-lined reactor is 200-300° C., and a reaction time is 8-10 hours.

Assignees

• Univ Zhejiang Normal

Inventors

• Jiao Yang
• Chen Jianrong
• Lin Hongjun
• Xu Yan
• Xu Yanchao

Classifications

• H01G11/46 Primary

  Metal oxides · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01P2004/04

  obtained by TEM, STEM, STM or AFM · CPC title

• C01P2004/03

  obtained by SEM · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title