▎ 摘　　要

Three-dimensional graphene materials have greatly expanded the market space of graphene, but their economical fabrication remains a challenge. Herein, we report a facile and low-cost method for the preparation of high-performance graphene hydrogels by adding ammonium-modified graphene oxide into low-dielectric constant organic solvents. By forming ammonium salts or through a re-protonation process, the graphene sheets are assembled together by electrostatic attraction or hydrogen bonding interactions, along with pi-pi interactions. The unique structure-aligned few-layer graphene sheets, abundant surface functional groups and multifarious pores-enables prepared hydrogels with both superior charge storage capability (207.6 F g(-1) at 1 A g(-1)) and excellent high-rate performance (83.2 % capacitance retention when the discharge current density is increased from 0.5 to 10 A g(-1)). In this study, we present some achievements in capacitive energy storage but, while they are encouraging, graphene-based materials prepared by this feasible and efficient route can also be applied to other advanced applications likenew-generation rechargeable batteries, sensors, biomedical engineering, and water purification.