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Enhancing capacitive deionization performance with charged structural polysaccharide electrode binders.

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Using charged polysaccharides like chitosan and carboxymethyl cellulose as binders in capacitive deionization (CDI) electrodes significantly boosts salt adsorption capacity (SAC) and energy normalized adsorption of salt (ENAS) by preventing anion repulsion.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Environmental Engineering

Background:

  • Capacitive deionization (CDI) is a promising technology for water desalination.
  • Performance is often limited by anion repulsion at the positive electrode, reducing salt adsorption capacity (SAC) and energy normalized adsorption of salt (ENAS).

Purpose of the Study:

  • To investigate the use of ionically charged polysaccharides, chitosan and carboxymethyl cellulose, as electrode binders in CDI.
  • To determine if these binders can prevent co-ion repulsion and enhance CDI performance.

Main Methods:

  • Composite CDI electrodes were prepared using chitosan and carboxymethyl cellulose as binders.
  • Electrode performance was evaluated by measuring SAC and ENAS.
  • A one-dimensional model integrating CDI and ion-exchange membrane covered (MCDI) sub-units was used to explore the adsorption mechanism.

Main Results:

  • Asymmetrically charged polysaccharide binders prevented co-ion repulsion, leading to SAC and ENAS values three times greater than those with polyvinylidene fluoride (PVDF) binders.
  • Polysaccharide binders shifted the discharge voltage of maximum adsorption, prolonging cycle lifetime without significant performance loss.
  • Model simulations indicated that charged polysaccharide layers on carbon macropores enhance adsorption through sequential salt accumulation and release.

Conclusions:

  • Ionically charged polysaccharides are effective binders for enhancing CDI performance by mitigating anion repulsion.
  • This approach offers a viable strategy for improving the efficiency and longevity of CDI systems for water desalination.