Novel preparation method of edge functionalized graphene catalyst

Abstract

The invention relates to a novel preparation method of an edge functionalized graphene catalyst. Mixed ball milling is carried out on graphite powder and conductive polymer monomer (such as pyrrole) at room temperature and normal pressure without adding any other chemical reagents, and ball milling is carried out continuously to obtain edge functionalized graphene nanosheet of the conductive polymer at the ball milling speed 25% lower than that reported previously and with ball milling time saved by 50%. The product is uniform in sheet, has the thickness being about 1.5 nanometers and the yield being 90% above, batch production of graphene can be effectively realized, the commercial cost is lowered, and the application universalness of graphene is popularized. The prepared product contains 6% of nitrogen atoms, provides effective active site for electrochemistry oxygen reduction, and can be directly used as an oxygen reduction catalyst with high performance. In the overall production process, toxic chemical reagent or high temperature and high pressure is not used. The preparation method is high in safety and environmental protection, simple in technological process and easy to operate.

Description

technical field [0001] The invention relates to the field of novel nanomaterials, in particular to a novel preparation method of an edge-functionalized graphene catalyst. Background technique [0002] Edge-functionalized graphene is a new type of derivative of graphene, especially edge nitrogen-doped graphene. The electron-withdrawing atomic nitrogen introduced at the edge of the large π bond of graphene makes the electron cloud flow from the adjacent carbon atom to the nitrogen atom. Migration, so that these carbon atoms are in an electron-deficient active state, with very high electrochemical catalytic performance. At the same time, due to the doping of nitrogen atoms on the edge of graphene, the carbon-carbon conjugated double bond on the surface of graphene is not damaged, thereby effectively maintaining the high conductivity of graphene and further improving the electrochemical catalytic performance of the product. The introduction of conductive polymers can not only p...

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Problems solved by technology

Pyrolysis of flammable gases at high temperature requires high experimental safety requirements and difficult control of experimental conditions

The prepared graphene film structure is too stable, it is difficult to modify and be used for device assembly

We have invented a new method of preparing graphene by solid-phase ball milling method in the early stage, but this method is to functionalize graphene through functional groups. Due to the limited size of functional groups, the degree of expansion of the graphite sheet structure is also limited, making the prepared graphene The graphene product sheets, size and quality are not uniform, and there are certain limitations in the industrialization process

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