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Graphene foam is a high surface area graphene-based material that combines the unique electrical properties of two-dimensional graphene with the physical properties of a metallic foam. It is a candidate substrate for electrodes in lithium-ion batteries. In addition to its mechanical and electrical properties, it is able to store energy, making it an attractive alternative to traditional battery materials.
Chemical Vapor Deposition (CVD) is one of the most widely used processes to produce graphene foam. However, only two review articles have been published on CVD-grown graphene foams. This review will provide an overview of the precursors, catalysts, chemical deposition process, and applications of CVD-grown graphene foams.
During the chemical vapour deposition process, the substrate is heated to 1000 degC in a H2/Ar atmosphere. After the vaporization of hydrogen and methane, the oxide layer is removed from the metal substrate. Then, carbonized carbon is added as the counter electrode. Once the carbonization is complete, a porous structure is formed on the substrate.
Graphene foam can be synthesized on a variety of substrates. One method is to deposit graphene onto a seashell template. Another method is to use a metallic substrate. These are both effective ways to synthesize graphene foam.
Other approaches involve the use of metal templates, which are soft and flexible. They offer more flexibility in the preparation of different types of catalysts. Some researchers have developed porous metal templates, which are based on either Ni or Fe chlorides.
Several studies have shown that structural characteristics of the materials remain intact after the removal of the scaffold. This allows for the development of graphene-based materials with high conductivity and a large specific capacitance.
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