▎ 摘　　要

Capacitive deionization (CDI) is considered as a potential water purification technology for electrochemical removal of the salt from aqueous solutions. However, the development of an electrode material with adequate electro adsorption rate and capacity is still a major challenge. In this study, a N and P-doped three-dimensional (3D) structure of graphene with high conductivity and capacitance for high performance CDI was synthesized and possessed tunable pore size through phosphoric acid activation. It had a large specific surface area of 567.14 m(2) g(-1) due to the 3D hierarchical porous structure and highly crosslinked networks of graphene sheets. This novel material also had a high specific capacitance (177.19 F g(-1)). High specific capacitance and interaction of micropores with mesopores improved the desalination capacity up to 20.93 mg g(-1). Consequently, the materials with high specific surface area, better specific capacitance and tunable pore size can have a great potential for efficient and practical desalination applications. (C) 2020 Elsevier Ltd. All rights reserved.