▎ 摘　　要

Porous graphene has been widely applied in energy storage, electrocatalysis, photoelectron devices, etc. However, the producing process for porous graphene usually needs long time and is a tedious step. In this work, porous graphene is prepared with controllable pore size by using active metal nanoparticles to catalytically oxidize carbon under microwave combustion process within tens of seconds. The ion exchange membrane based on porous graphene with approximate to 5nm pore diameter exhibits a great performance for salinity gradient power generation application with a power density output of approximate to 1.15W m(-2). This work highlights a new strategy for the design and synthesis of pore-size-controllable porous graphene and provides new opportunities for 2D porous nanomaterials.