Graphene-based aerogels(GA) are three-dimensional macrostructures of graphene with interconnected networks. While inheriting the excellent chemical stability and catalytic performance of graphene, GA exhibits higher specific surface area and excellent conductivity comparing to two-dimensional structure. Because of the superior properties and unique structure, GA are widely applied in catalysis, energy storage and adsorption. This review is expanded around the catalytic reduction performance of GA. Firstly, the preparation methods of GA with different catalytic properties are reviewed, which are classified into four types as graphene aerogels, doped GA, GA composite and doped GA composite. Then the influence on catalytic performance of GA prepared with different methods is introduced in detail. The admirable electrochemical and catalytic performance of GA indicates wide application prospects in fuel cells, dye-sensitized solar cells, microbial electrolysis cells and electrochemical sensors. Finally, the catalysis applications of GA are analysed and outlooked.

Contents
1 Introduction
2 GA and its catalytic properties
3 Synthesis and modification of catalytical active GA
3.1 Preparation of pure GA
3.2 Preparation of doped GA
3.3 Preparation of GA composite
3.4 Preparation of doped GA composite
4 Applications of GA in reduction catalyst
4.1 Applications in positive electrode of fuel cells
4.2 Applications in counter electrode of dye-sensitized solar cells
4.3 Applications in cathode of microbial electrolysis cells
4.4 Applications in hydrogen peroxide electro-chemical sensors
5 Conclusion and outlook