▎ 摘　　要

Porous graphene represents promising electrocatalysts or substrates of composite electrocatalysts for various electrochemical reactions, and is well-established for renewable energy conversion and environmental remediation. Unfortunately, the lack of comprehensive understanding on the active sites of porous graphene hinders the further development of high-performance electrocatalysts. Herein, porous graphene was established for electrochemical filtration of wastewater, with results indicating that porous graphene exhibited excellent electrochemical activity in terms of high efficiency of oxidation or reduction of organic pollutants. It was experimentally and theoretically demonstrated that the -OH groups generated on the edge of porous graphene served as the active sites for the electrocatalytic reactions. The augmentation of -OH groups at the edges of graphene benefited the inner-sphere electron transfer of the electrocatalytic reactions, improving the electron transfer rates by nearly four times (from 0.034 s(-1) to 0.135 s(-1)). Through providing these fundamental insights into the role of the active sites on the pores of porous graphene, this work furnishes future directives for the design of porous graphene-based electrocatalysts. (C) 2019 Elsevier Ltd. All rights reserved.