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Related Experiment Video

Updated: Dec 27, 2025

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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MXene as a Cation-Selective Cathode Material for Asymmetric Capacitive Deionization.

Bingbing Chen1,2, Aihu Feng1,2, Ruixiang Deng1,2

  • 1Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences (SICCAS), Shanghai 200050, China.

ACS Applied Materials & Interfaces
|March 4, 2020
PubMed
Summary

This study introduces a novel asymmetric capacitive deionization (CDI) cell using sodium-intercalated MXene as a cathode. This design significantly enhances water desalination capacity and charge efficiency by minimizing the co-ion expulsion effect.

Keywords:
MXene (Ti3C2Tx)asymmetric capacitive deionizationcation-selective cathode materialco-ion expulsion effectnegatively charged group

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Area of Science:

  • Materials Science
  • Environmental Science
  • Electrochemistry

Background:

  • Capacitive deionization (CDI) is a key technology for freshwater production.
  • The co-ion expulsion effect in CDI limits electrosorption capacity and charge efficiency.
  • Developing advanced electrode materials is crucial for improving CDI performance.

Purpose of the Study:

  • To engineer an asymmetric CDI cell to mitigate the co-ion expulsion effect.
  • To evaluate the performance of Na+-intercalated Ti3C2Tx (NaOH-Ti3C2Tx) as a cation-selective cathode.
  • To investigate the desalination mechanism in the developed asymmetric CDI system.

Main Methods:

  • Assembly of an asymmetric CDI cell with NaOH-Ti3C2Tx cathode and activated carbon (AC) anode.
  • Characterization of NaOH-Ti3C2Tx for its surface properties and interlayer spacing.
  • Performance testing of the asymmetric CDI cell in NaCl solution, comparing it with a symmetric AC cell.

Main Results:

  • The asymmetric CDI cell with NaOH-Ti3C2Tx achieved a higher electrosorption capacity (12.19 mg g-1) compared to the symmetric AC cell (4.55 mg g-1).
  • The charge efficiency was significantly improved in the asymmetric cell (0.826) versus the symmetric cell (0.306).
  • The NaOH-Ti3C2Tx cathode demonstrated excellent cyclic stability for desalination.

Conclusions:

  • NaOH-Ti3C2Tx is a promising cation-selective cathode material for enhancing asymmetric CDI performance.
  • Reduced co-ion expulsion and expanded interlayer space contribute to improved desalination.
  • The findings provide a foundation for developing other 2D materials, like MXene, for advanced CDI applications.