Study on preparation and electrothermal performance of self-supported 3D graphite foam
As a new type of three-dimensional(3D)graphene material,graphene foam has a unique network/skeleton structure,and shows greater performance advantages than two-dimensional(2D)graphene in many fields.However,the high porosity and low mechanical strength of its own structure also limit the application of graphene foam.In this paper,a self-supported 3D graphene foam with graphene sheet/layer thickness of 150～350nm was prepared by chemical vapor deposition(CVD)method using 2mm thick commercial nickel foam as growth template.Further,high-quality compressed graphite foam was obtained by optimizing the carbon-to-hydrogen ratio and compressing the growth template during the preparation process.Experimental studies confirmed that the compressed graphite foam with thicker graphene layer,higher crystallinity and denser network skeleton structure had excellent electrothermal performance.Under the low driving voltage of 3V,the electric heating temperature of the moderately compressed high-quality graphite foam could reach 580℃,which was about 220℃ higher than that of conventionally prepared graphite foam.The research also demonstrated that the electrothermal de-icing effect of the compressed graphite foam was remarkable,and it had both highly efficient conduction heating and superior radiative heating capability.As a new kind of electric heating material with high efficiency and energy saving,compressed graphite foam has great potential application value in household appliances,artificial intelligence,health care,energy,thermal management and other fields.
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