题　目：Graphene oxide-based materials for clean energy applications

　　报告人：Dr. Dawei Wang (School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia)

　　时　间：3月9日（周三）14:00-15:30

　　地　点：研究生教育大厦202室

　　摘　要：

　　Graphene oxide (GO), as an oxidised derivative of graphene, is a type of water-soluble material with atomic thickness, which is obtained through strong acid attack of graphite crystals to introduce oxygen-containing groups in the graphite stacks followed by a complete exfoliation of the oxidised solid into nanosheets. The oxygen functional groups have been identified as mostly in the form of hydroxyl and epoxy groups on the basal plane of the GO sheet, with smaller amounts of carboxyl, carbonyl, phenol, lactone, and quinone at the sheet edges. The unique structural features endow GO with many intriguing surface chemical properties, such as amphiphilicity, negatively charged nature and multi oxygen-containing groups on its sheets. Therefore, GO can be viewed as a 2D soft material and is a building block of diverse GO-based materials with abundant microstructures.

　　The study of GO-based materials in recent years has attracted great attention, particularly with respect to electrochemical energy applications. These are ascribed to the advantages of GO, including its facile synthesis, high dispersibility in a variety of solvents, capability of coupling electroactive species onto the surface, and unique optical properties. Another important issue is consideration of the costs when manufacturing an electrode for use in any real system. In terms of the manufacture of GO-based devices, costs can be reduced compared with the costs for conventional electrodes.

　　In this lecture, the fundamental structure, properties and several applications of GO-based materials in energy storage and conversion are discussed.

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