Preparation And Characterization Of Graphene And Graphene-based Composites

Graphene, with many super properties, has the great potential in the related fields of catalysis, energy storage and multi-functional composite materials. It has been given great concern in the scientific community and industry all over the world. The development of graphene-based materials employed in environmental management and new energy, can shorten the industrial chain of graphene and promote mass production technology. Furthermore, it can step gradually forward to the high-quality graphene-based products and accelerate the industrialization of graphene.In this paper, based on the "knitting" principle, the ultrasound-assisted self-assembly method for synthesis of grapheme-MnO₂ nano-composites was proposed. The novel composite presented excellent catalytic performance for the treatment of toxic organic compounds in waste water. However, the separation of catalyst is relatively difficult. Therefore, novel magnetic grapheme-MnO₂ nano-composites were synthesized. It not only simplifies the separation process, but also helps to improve the catalytic properties. Then, a series of nitrogen-doped grapheme-MnO₂ nano-composites were synthesized by ammonia pretreatment and one-step approach. These materials exhibit excellent electrochemical properties and can be used as electrode material for energy storage devices.