▎ 摘　　要

Mesoporous graphene electrodes are facilely fabricated via a simple thermal treatment of graphene oxide as well as site-localized etching of Fe3O4 nanoparticles (E-Gr-Fe3O4). Influences of FeCl2 precursor on the amount of Fe3O4 nanoparticles and textural properties of E-Gr-Fe3O4 are investigated. The obtained graphene framework exhibits a porous structure with a specific surface area of 362 m(2)/g and excellent specific capacity of 128 F/g, which is twice higher than that of pristine reduced graphene oxide electrodes (RGO, 66 F/g). With the enhanced electrochemical capacity, low inner resistance and good stability, the as-prepared mesoporous E-Gr-Fe3O4 electrode exhibits a high electrosorptive capacity of 10.3 mg/g when the initial NaCl conductivity is 300 mu s/cm, which is much higher than that of RGO (6 mg/g). The results demonstrate that E-Gr-Fe3O4 is quite a promising candidate as high performance electrodes for capacitive deionization. (C) 2015 Elsevier Ltd. All rights reserved.