A solar desalination charger for water treatment and value-added chemical production

초록

This study presents a photoelectrocatalytic desalination charger for the remediation of aquatic pollutants and the production of value-added chemicals. Under 1 sun irradiation, a Co-WBVO (BiVO4 doped with W and deposited with CoOOH) photoelectrode and aqueous NaxC electrode (Na on carbon felt, NaxC) pair efficiently desalinates brackish water (0.171 M NaCl) through ion-exchange membranes at an ion transport efficiency of similar to 100%. The desalted chloride is partially oxidized by photogenerated holes into reactive chlorine species (RCSs) at a faradaic efficiency (FE) of >90%. The in situ generated RCSs are actively involved in the sequential oxidation of As(iii) and NH4+. Meanwhile, the desalted Na+ is rapidly inserted into NaxC without any accumulation. Upon coupling with the charged NaxC, the electrocatalytic production of H(2)O(2)via O-2 reduction with carbon nanotubes, H(2)via H2O reduction with NiMoS, and HCOOH via CO2 reduction with porous Bi are achieved at FEs of >80%. The as-designed PEC hybrid of the proof-of-concept can be applied to various purposes, including desalination, seawater electrolysis, production of value-added chemicals, and energy storage.

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