In recent years, three dimensional (3D) graphene derived from 2D graphene assemblies, is an emerging functional material in the field of graphene chemistry. Integration of graphene sheets, two-dimensional (2D) nanoscale building blocks, into 3D assemblies which have well-defined 3D architecture, is an effective way for tuning and/or controlling the electrical, optical, chemical, mechanical or catalytical properties. As a novel kind of functional materials, the methodology for preparing 3D graphene materials with micro-/nano-architectures and the potential applications have triggered tremendous interests. The rationally designed 3D graphene architecture may not only provide inherently excellent properties of 2D graphene materials, such as high electronic, optical and catalytical properties, but also exhibit micro-/nano-architectures, huge specic surface areas, strong mechanical strengths, high electron conductivity and fast mass transport kinetics. Until now, 3D graphene materials have demonstrated superior performance when applied in nanoelectronics, energy storage/conversion, chemical and biological sensing, hybrid materials and other areas. In this article, we review recent advances of 3D graphene and its composite materials in the fields of catalysis, hydrogen/gas storage, sensor fabrication, environmental protection and supercapacity. The current challenges and future perspectives in the applications of 3D graphene materials are also outlined.

Contents
1 Introduction of 3D graphene materials
2 Preparation of 3D graphene architectures
3 Applications of 3D graphene and its composite materials
3.1 Applications as catalysis
3.2 Applications in hydrogen storage and other gases adsorption
3.3 Applications in fabrication of sensor
3.4 Applications in environmental remediation
3.5 Applications in fabrication of supercapacitor
4 Conclusion and outlook