Novel 3D Foam Current Collector Developed for Desalination
tech innovation 2022
Schematic diagram of flow-electrode capacitive desalination using a three-dimensional foam current collector for actual seawater desalination. credit: Zhou Hongjian
A research group from the Hefei Institute of Physical Science (HFIPS) of the Chinese Academy of Sciences has developed a flow-electrode capacitive desalination technology with a three-dimensional (3D) foam current collector for real seawater desalination. their studies . was published in water research,
Flow electrode capacitive desalination (FCDI) technology, as a new water treatment technology, has attracted much attention for seawater desalination. Conventional FCDI devices suffer from low charge transfer efficiencies and disproportionate salt removal rates. Therefore, the search for new existing collectors to improve the charge transfer capability and electric field distribution of FCDI devices is an urgent need.
The 3D electric method has been recognized as an effective solution to enhance the charge transfer capacity of FCDI devices for saltwater treatment. This increases the surface-to-body ratio of the flow-electrode chambers, which can greatly promote the charge transfer area and electric field distribution.
In this study, the researchers proposed a 3D carbon-coated nickel foam to replace the titanium mesh and graphite plate as a novel current collector to enhance the desalination performance in the FCDI device.
The 3D foam current collector acts as the charge conductor. Its intrinsic 3D interconnected open-pore structure was used as a flow channel to expand the charge transfer region and electric field distribution between the current collector and the carbon solution.
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3D electric field simulation of (a) 2D planar structured and (b) 3D foam-structured current collector; Charge transfer region of (c) 2D planar structured and (d) 3D foam-structured current collector. credit: Zhou Hongjian
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(One). Long-term desalination testing of simulated seawater; (b). salt removal efficiency of various seawater samples; (C). Long-term desalination testing of a sample of real seawater from the Yellow Sea and (d). CF-FCDI device in the South China Sea. credit: Zhou Hongjian
The researchers simulated the electric field and flow field of carbon slurries in various pore sizes of 3D foam and 2D titanium mesh models in 3D electric field and computational fluid dynamics simulations.
They found that the charge transfer area of the 3D foam current collector was significantly larger than that of the 2D planar current collector, which enabled more activated carbon particles to be charged effectively, and improved the charge transfer capacity and desalination performance of FCDI.
In addition, the electrochemical measurements showed a significant decrease in the charge transfer resistance. The electrochemically active surface of the 3D foam current collector was enlarged. It showed good salt removal efficiency.
This new 3D foam-structured current collector provides a new strategy for seawater desalination to increase the charge transfer capacity and overall desalination efficiency of FCDI devices.
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Xinyuan Zhang et al, Flow-electrode capacitive deionization using three-dimensional foam current collector for real seawater desalination, water research (2022). DOI: 10.1016/j.wattres.2022.118642
Citation: Novel 3D Foam Current Collector Developed for Desalination (2022, June 20) Retrieved 20 June 2022
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