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Synthesis of novel 2D/2D Ti3C2Tx MXene / 1T-MoS2 heterostructure enhanced with carbon nanotubes as a highly-efficient electrode for hybrid capacitive deionization

Zargar, S. A ; Sharif University of Technology | 2024

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jallcom.2024.173765
  3. Publisher: 2024
  4. Abstract:
  5. MXenes are a prominent group within 2D materials with extensive utilization in various electrochemical applications due to their notable specific capacitance, swift ion intercalation kinetics, and favorable hydrophilicity. Despite this, they suffer from low oxidation resistance and ease of layer restacking. Herein, an effective approach to overcome this inherent weakness of MXenes was employed by embedding MoS2 nanopetals as pillars into the backbone of Ti3C2Tx MXene by a one-step hydrothermal technique. It not only alleviates the restacking problem of Ti3C2Tx but also shorten the diffusion path of sodium ions. Meanwhile, ammonium bicarbonate as a guest ion agent was utilized to achieve the 1 T phase of MoS2 with numerous edge-active sites to overcome the low electrical conductivity of the 2 H phase derived from the semiconducting nature. The incorporation of carbon nanotubes (CNTs) has strengthened the structural integrity of the Ti3C2Tx/1 T-MoS2/CNTs composite by linking 2D material components. Moreover, it elevates the heterostructure's overall electrical conductivity by establishing multiple routes for efficient electron transfer. As a result, the membrane-free established hybrid capacitive deionization cell with Ti3C2Tx/1 T-MoS2/CNTs // activated carbon demonstrates a remarkable salt removal capacity of 25.82 mg.g−1 along with an outstanding high removal rate of 5.25 mg.g−1.min−1 and superior cyclic stability (98.1% desalination capacity retention rate). This work represents a simple approach for rational designing low-dimensional heterostructure materials with high connectivity and straightforward electron transferring for electrochemical desalination. © 2024 Elsevier B.V
  6. Keywords:
  7. 3D heterostructure ; MoS2 ; Carbon nanotubes ; Desalination ; Electric conductivity ; Electron transitions ; Layered semiconductors ; Metal ions ; Sulfur compounds ; Titanium compounds ; Capacitive deionization ; Electrical conductivity ; Electrochemical applications ; Interconnected network ; Ion intercalation ; Mxene ; Restacking ; Specific capacitance ; Swift ions ; Molybdenum compounds
  8. Source: Journal of Alloys and Compounds ; Volume 981 , 2024 ; 09258388 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0925838824003517