Hollow biological carbon sphere-based nickel sulfide nanorod supercapacitor and preparation method

Abstract

The invention discloses a preparation method of a nickel sulfide nanorod loaded hollow biological carbon shell supercapacitor; specifically, biological yeast is added into a mixed solution of glutaraldehyde and deionized water to be subjected to hydrothermal reaction for 12h at 180 DEG C, and a brown red sample is collected by centrifugal drying. The collected sample is then added into a muffle furnace to be heated to 300 DEG C at the heating rate of 1 DEG C / min and the temperature is kept for 1h; the collected black sample is placed into a tubular furnace to be heated to 800 DEG C at the heating rate of 2 DEG C / min and the temperature is kept for 3h to obtain a hollow nitrogen-doped biological carbon shell. The hollow nitrogen-doped biological carbon shell is added to a mixed solution ofnickel nitrate, thiourea and sodium phosphite to carry out ultrasonic wave and stirring treatment; then hydrothermal reaction is performed at 180 DEG C for 6 hours, and then centrifugal drying is carried out to obtain a NiS / NHCS composite sample. The preparation method disclosed by the invention is characterized in that green and environment-friendly cheap biological yeast is used in the preparation process; the hollow nitrogen-doped biological carbon shell is coated with nickel sulfide so as to better improve the specific capacity, the rate performance and the stability of the nickel sulfide.In the long-time oxidation reaction process, the damage of the loaded nickel sulfide nanorod to the hollow nitrogen-doped biological carbon shell is reduced, the specific surface area is enlarged, the conductivity of the composite material is increased, and the prepared composite material has high rate performance.

Description

technical field [0001] The invention relates to a high-capacity hollow biological carbon sphere-based nickel sulfide nanorod supercapacitor and a preparation method thereof, in particular to a supercapacitor with high stability and high specific capacity and a preparation method thereof. Background technique [0002] The increasing demand for large-scale energy storage systems for renewable energy has accelerated the research and development of new high-performance energy storage devices. People have been seeking new types of energy storage devices, supercapacitors, which have higher safety and lower cost than advanced batteries. Energy storage and conversion devices, especially supercapacitors, have received increasing attention due to better utilization of renewable resources. Supercapacitors are also considered as one of the most promising devices due to their fast charge and discharge capabilities, high cycle life, and high power density. Compared with rechargeable bat...

AI Technical Summary

Problems solved by technology

However, the oxidation-reduction reaction of nickel sulfide in its charge and discharge process will produce volume effect and cause capacity attenuation.

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