Journal
WATER RESEARCH
Volume 239, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2023.120051
Keywords
Redox flow desalination; Dye-sensitized solar cell; TiO 2 photoanode; NiO photocathode
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We demonstrate a novel solar-driven redox flow desalination device with double photoelectrodes, achieving efficient desalination without electrical energy consumption. The device consists of three units: a photoanode unit, a photocathode unit, and a redox flow desalination unit. Under light illumination, high-quality freshwater is obtained from brackish water. The device can work in multiple desalination cycles without significant performance declines, opening opportunities for efficient and practical solar-driven desalination processes.
High energy consumption and low salt removal rate are key barriers to realizing practical electrochemical seawater desalination processes. Here, we demonstrate a novel solar-driven redox flow desalination device with double photoelectrodes to achieve efficient desalination without electrical energy consumption. The device consists of three parts: one photoanode unit, one photocathode unit, and one redox flow desalination unit sandwiched between the two photoelectrode units. The photoelectrode units include a TiO2 photoanode and a NiO photocathode sensitized with N719 dye, triiodide/iodide redox electrolyte, and graphite paper integrated electrodes decorated with 3,4-ethylene-dioxythiophene. Two salt feeds are located between two ferro/ferricyanide redox flow chambers. Under light illumination, high-quality freshwater is obtained from brackish water containing different concentrations of NaCl from 1000 to 12,000 ppm with a high NaCl removal rate. The device can work in multiple desalination cycles without significant performance declines. Furthermore, natural seawater with an ionic conductivity of 53.45 mS cm-1 is desalinated to freshwater. This new design opens opportunities to realize efficient and practical solar-driven desalination processes.
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