Lanzhou Institute of Chemical Technology has made progress in the research of graphene composite materials and devices

[ Instrument network instrument research and development ] As a new type of carbon nanomaterial, graphene has the advantages of high mechanical strength, good electrical and thermal conductivity, large specific surface area, and good chemical stability. It is used in energy storage, electronic devices, sensing materials, catalysts, Anti-corrosion coatings and other fields show extremely broad potential application prospects. At present, the application of graphene mainly adopts the approach of composite materials for performance improvement, and its preparation methods mainly include chemical reduction, hydrothermal, sol-gel and electrochemical methods.

Recently, Li Xinheng's team at the State Key Laboratory of Carbonyl Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, developed a method for preparing graphene composites in combination with electrochemistry and other technologies, and prepared metal oxides with good uniformity and strong binding force. , Polyaniline, phosphide graphene composite materials, low cost, environmentally friendly, and suitable for large-scale production.

The preparation method effectively solves the problems of poor controllability, graphene lamination, nanoparticle agglomeration, and easy structure collapse of the previous methods. Manganese oxide exhibits good monodispersity, graphene sheets have no obvious stacking, and are porous. The method is easy to prepare gram-weight composite materials. The researchers assembled the prepared composite material into an asymmetric water-based supercapacitor, which has the advantages of flexible foldability, no adhesive, and environmental protection (aqueous electrolyte). The power density of the assembled supercapacitor is obviously greater than 40Wh/kg, and it still maintains more than 80% of the initial capacity after 2000 cycles. The composite material is applied to the electrocatalytic electrode material, which greatly reduces the overpotential.

Related results were published on J.Mater.Chem A. Supported by the National Natural Science Foundation of China General Program, National Key Research and Development Program, Jiangsu Natural Science Foundation, Suzhou Key Industry Technology Innovation Fund, Special Talent Project of Lanzhou Institute of Chemicals, and State Key Laboratory of Carbonyl Synthesis and Selective Oxidation.