Highly Efficient Porous Conductive Polymer Electrode for Seawater Desalination
Porous and conductive organic polymer materials are of great importance to achieve high-efficiency desalination by using the battery deionization technique. Herein, the first conductive porous polymer electrode, based-on poly (anthraquinonyl sulfide) (PAQS), has been successfully fabricated and demonstrated with high-efficiency for natural seawater battery deionization(BDI). The merits of this electrode is benefited from the low charge transfer resistance, abundant pores and highly redox-active characters of PAQS. Moreover, different from the reported materials, the as-fabricated electrode can be used to remove multiple cations simultaneously for natural seawater. The removal capacity achieved in natural seawater for Na+, K+, Mg2+, Ca2+ is up to 50.0 mg g-1, 2.3 mg g-1, 5.9 mg g-1, and 1.7 mg g-1, respectively. Detalied mechanism study reveals that PAQS undergoes a multiple ions insertion and extraction process through the reversible redox reaction within the C=O groups of PAQS during the electrochemical process. The present study not only reported the first porous conductive polymer electrode for highly efficient BDI, it also paves the way for developing novel organic polymer electrode for seawater and saline water desalination.