Recently, Wang Qi and others of the Institute of Plasma Applications at the Institute of Plasma Science, Hefei University of Science and Technology, Chinese Academy of Sciences have successfully prepared highly dispersed graphene platinum nanocomposites using low temperature plasma technology. The related results have been published in Applied Physics Letters, a top journal in applied physics.
Graphene platinum composites can improve the reaction efficiency of fuel cells, and have a wide range of application prospects in aerospace, energy, environmental and other fields. However, the graphene noble metal composites prepared by traditional chemical methods need to use chemical reagents to reduce precious metals such as platinum, gold, etc.; and surfactants are often used to improve the dispersibility of nano-metal particles and affect the properties of the materials themselves. , And the preparation process is lengthy and brings about environmental pollution.
Wang Qi told reporters of the “China Science Journal†that after a lot of experimental studies, they found that plasma treatment on graphene oxide and metal composites can simultaneously reduce graphene oxide and platinum salt precursors, and then directly produce graphene platinum. Nanocomposites. In a self-made inductively coupled plasma discharge device, a mixture of graphene oxide and chloroplatinic acid was placed in advance, and then argon plasma was directly applied to the mixture. Graphene oxide was rapidly converted to graphene, while chlorine Platinum acid is reduced to pure platinum, and graphene-platinum nanocomposites are prepared in one step. The degree of dispersion and particle size of the obtained platinum particles are related to the time of plasma action.
This method is fast, convenient and environmentally friendly. It avoids the use of chemical reducing agents and opens up new ideas and methods for preparing graphene precious metal particles. With the development of low-temperature plasma technology, it is expected to achieve low-cost, large-scale production of this material.
At the same time, researchers have made corresponding progress in the preparation of nitrogen-doped graphene-platinum nanocomposites using plasma technology. They use other gases such as hydrogen, ammonia, etc., to perform plasma treatment on graphene oxide, and nitrogen-doped graphene can be directly prepared. Further, noble metal-doped graphene nanocomposites with different substrates can be prepared by the aforementioned methods. . Applying it to electrocatalytic oxidation of methanol can significantly improve the electrocatalytic performance, which is superior to commercial catalysts and other platinum-based catalysts reported so far. The study was published in ChemPlus Chem, a sister publication of German Applied Chemistry. (Reporter Zhang Nan)
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