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

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 (BiVO 4 doped with W and deposited with CoOOH) photoelectrode and aqueous Na x C electrode (Na on carbon felt, Na...

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Bibliographic Details
Published in:Energy & environmental science 2024-07, Vol.17 (13), p.4488-4497
Main Authors: Kim, Seonghun, Han, Dong Suk, Park, Hyunwoong
Format: Article
Language:English
Subjects:
Brackish water
Carbon dioxide
Carbon nanotubes
Chloride transport
Chlorine
Desalination
Electrolysis
Energy storage
Ion exchange
Ion transport
Irradiation
Nanotechnology
Nanotubes
Oxidation
Seawater
Sodium chloride
Water treatment
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Summary: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 (BiVO 4 doped with W and deposited with CoOOH) photoelectrode and aqueous Na x C electrode (Na on carbon felt, Na x C) pair efficiently desalinates brackish water (0.171 M NaCl) through ion-exchange membranes at an ion transport efficiency of ∼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 NH 4 + . Meanwhile, the desalted Na + is rapidly inserted into Na x C without any accumulation. Upon coupling with the charged Na x C, the electrocatalytic production of H 2 O 2 via O 2 reduction with carbon nanotubes, H 2 via H 2 O reduction with NiMoS, and HCOOH via CO 2 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. This study presents a photoelectrocatalytic desalination charger for the remediation of aquatic pollutants and the production of value-added chemicals.
ISSN:1754-5692
1754-5706
DOI:10.1039/d4ee00782d