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Graphene is a unique and attractive electrochemical material.First, graphene has large theoretical specific surface area (2630 m2 g-1).All atoms of a single-layer graphene sheet can be considered as surface atoms and they are capable of adsorbing gas molecules,providing the largest sensing area per unit volume.Second,the interaction between graphene sheets and other components could vary from weak Van der Waals interaction to strong covalent bonding.