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Synthesis and Characterization of Prussian Blue Analogues/MXene Composite as efficient electrode for Capacitive Deionization

Hekmati, Mehdi | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58676 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Malek Khachatourian, Adrine; Nemati, Ali
  7. Abstract:
  8. With the rapid development in industrial processes and the constant surge in the population of the entire world, freshwater resources have witnessed a significant rise in demand, leading to tremendous efforts to purify various sources of water. Capacitive deionization (CDI) comes forward as one such viable method of water desalination, particularly of brackish water, as it has low energy demands. In CDI systems, carbon-based electrodes are commonly employed for ion removal, but are restricted by their low ion adsorption capacity, which affects overall performance. Nickel-based Prussian Blue analogues (PBAs) have also attracted attention more recently for application in CDI due to their open structure and availability of appropriate sites for ion storage, thus providing them with high desalination capacities. Yet, their applicability is restrained by poor electrical conductivity and low specific surface area, primarily attributed to agglomeration. In the present work, surface etching and nanoframe-structure formation improved the electrochemical performance. As such, the specific capacitance was increased from 150.87 F g-1 to 162.75 F g-1 at a scan rate of 5 mV s-1. Moreover, nitrogen-doped titanium carbide MXene with high electrical conductivity and a layered structure was employed to improve the overall performance of the electrode. The specific capacitance of MXene was significantly enhanced to 90.62 F g-1 by nitrogen doping. Then, compositing the nanoframes with nitrogen-doped MXene resulted in a marked increase in the specific surface area, from 21 m2 g-1 in the pristine PBA nanocubes to 218 m2 g-1 in the composite with 10 wt% nitrogen-doped MXene. The composite electrode exhibited a higher specific capacitance of 213.125 F g⁻¹ at 5 mV s-1, much higher than for pristine PBA nanocubes (150.87 F g-1) as well as for nitrogen-doped MXene alone. Finally, when it was tested in a CDI cell, the composite electrode exhibited an ion adsorption capacity of 36.8 mg g-1, thereby solidifying its legitimacy as an effective cathode material for capacitive deionization
  9. Keywords:
  10. Capacitive Deionization ; Cobalt Iron Prussian Blue Analogues ; Potassium Nickel Hexacyanoferrate ; Water Treatment ; MXene Nanosheets ; Titanium Carbide ; Desalination ; Nitrogen Doped MXenes ; Electrodes

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