Method for preparing carbon nanosphere with hierarchical pore high graphitization degree

Abstract

The invention discloses a method for preparing a carbon nanosphere with a hierarchical pore high graphitization degree. The method comprises the following steps: (1) uniformly stirring and mixing glucose and other biologic materials, a nickel salt or a cobalt salt and an anionic surfactant in distilled water, adding the mixture into a hydrothermal reactor, and heating and maintaining the temperature for a certain time; (2) adding the obtained amorphous carbon material into a heating furnace in nitrogen protection, and heating and maintaining the temperature for a certain time; and (3) cleaning the obtained carbon material with dilute acid, and finally cleaning with distilled water and drying, thereby obtaining the finished product. The carbon sphere prepared by the method disclosed by the invention is low in cost, readily available, adjustable in diameter, high in porosity, adjustable in quantity and size of pores, high in graphitization degree and high in conductivity.

Description

technical field [0001] The invention relates to a preparation method of carbon nanospheres, in particular to a preparation method of carbon nanospheres with hierarchical holes and high graphitization degree. Background technique [0002] Most of the current carbon electrode materials are graphite and activated carbon. Although graphite has good conductivity, it has low porosity and low adsorption efficiency; although activated carbon has high porosity, it has poor conductivity because it is an amorphous carbon material, and activated carbon Most of the pores in the activated carbon are micropores. In the organic electrolyte, the electrolyte molecules are relatively large, and the pores of activated carbon cannot be fully utilized. [0003] Carbon spheres have the advantages of adjustable diameter and simple preparation. However, when carbon spheres are used as electrode materials, the pores that can be used are only on the outer surface of carbon spheres, and the spatial st...

AI Technical Summary

Problems solved by technology

However, when carbon spheres are used as electrode materials, the pores that can be used are only on the outer surface of carbon spheres, and the spatial structure of the inner surface of carbon spheres cannot be fully utilized; even in catalytic reactions, carbon spheres are used as nano-metal oxide carriers. At that time, only the surface of carbon spheres can be used in the structure of carbon spheres, which inevitably leads to the waste of carbon spheres. For example, Haoyong Yin et al. published in the paper on pages 1018-1023 of Sensors and Actuators B 222 in 2016 , using carbon spheres as Cu / Cu 2 O carrier, but the internal structure of carbon spheres has not been fully utilized; Linjing Yang et al. published a paper on pages 490-498 of Nano Energy 22 in 2016, they used carbon spheres as MoS 2 The carrier is used in the hydrogen catalytic reaction, the internal structure of carbon spheres is not fully utilized

The method with the lowest cost for preparing carbon nanospheres is the hydrothermal method, but the carbon nanospheres prepared by hydrothermal method have low degree of graphitization and poor electrical conductivity.

In order to improve the degree of graphitization of hydrothermal carbon spheres, it is necessary to carry out graphitization at a temperature of about 2000 ° C, so the preparation cost of graphitized carbon spheres is too high

Images