Chinese scientists successfully prepared graphene platinum composites

Recently, Dr. Wang Qi, from the Laboratory of Low Temperature Plasma Application, Institute of Plasma Science, Hefei Institute of Material Science, Chinese Academy of Sciences, successfully prepared graphene platinum nanocomposites with good dispersibility using low temperature plasma technology. Related results have been published in the Applied Physics Letters, the top journal in applied physics. Graphene platinum composite materials can improve the reaction efficiency of fuel cells, and have a wide application prospect in aerospace, energy, environmental and other fields. However, graphene precious metal composites prepared by traditional chemical methods require chemical reagents to reduce the preparation of precious metal elements, such as platinum, gold, etc.; and surfactants are often used to improve the dispersion of nano metal particles, which will affect the properties of the materials themselves. And the preparation process is lengthy and brings environmental pollution. Wang Qi told the reporters of the Chinese Journal of Science and Technology that they have discovered through extensive experimental research that plasma treatment of graphene oxide and metal complexes can simultaneously reduce graphene oxide and platinum salt precursors, and directly produce graphene platinum. Nanocomposites. They placed a mixture of graphene oxide and chloroplatinic acid in a self-contained inductively coupled plasma discharge device, and then directly applied to the mixture by argon plasma. The graphene oxide was rapidly converted into graphene and chlorine. The platinum acid is reduced to platinum, and the graphene-platinum nanocomposite is obtained in one step. The degree of dispersion and particle size of the obtained platinum particles are related to the plasma action time. This method is fast, convenient and environmentally friendly, avoiding the use of chemical reducing agents, and opens up new ideas and methods for the preparation of graphene precious metal particles. With the development of low temperature plasma technology, it is expected to achieve low cost and large scale preparation of the material. At the same time, researchers have made corresponding progress in the preparation of nitrogen-doped graphene-platinum nanocomposites by plasma technology. They can directly prepare nitrogen-doped graphene by plasma treatment of graphene oxide by using other gases such as hydrogen gas, ammonia gas, etc., and then obtain noble metal-doped graphene nanocomposites with different substrates by the foregoing method. . Applying it to electrocatalytic oxidation of methanol can significantly improve electrocatalytic performance, superior to commercial catalysts and other platinum-based catalysts reported so far. The research was published in ChemPlusChem, a sister magazine of Applied Chemistry in Germany.

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