▎ 摘　　要

A simple process has been proposed to prepare three-dimensional N-doped graphene. The graphene shows outstanding performances when evaluated as anode for sodium ion battery, delivering a high reversible capacity of 405.2 mA h g(-1) at 0.05 A g(-1) and maintaining a retention of 100% up to 3700 cycles at 2 A g(-1). The excellent performances are ascribed to unique hierarchical porous architecture with large surface area and the N-doping-induced defects, which both can facilitate the storage and diffusion of Na+ and inhibit the restacking of graphene during cycling. (C) 2017 Elsevier B.V. All rights reserved.