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Locally Enhanced Flow and Electric Fields Through a Tip Effect for Efficient Flow-Electrode Capacitive Deionization.

Ziquan Wang1, Xiangfeng Chen1, Yuan Zhang1

  • 1College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, People's Republic of China.

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Summary

A novel tip-array current collector (T-CC) significantly enhances ion and charge transfer in flow electrode capacitive deionization (FCDI). This new design boosts salt removal rates and demonstrates superior long-term stability for efficient water desalination.

Keywords:
Capacitive deionizationCurrent collectorDesalinationFlow-electrodeTip effect

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Environmental Engineering

Background:

  • Capacitive deionization (CDI) is a promising desalination technology.
  • Flow electrode capacitive deionization (FCDI) faces challenges in charge and ion transport kinetics, limiting efficiency.
  • Current collectors significantly impact FCDI performance by influencing flow and electric fields.

Purpose of the Study:

  • To develop and evaluate a novel tip-array current collector (T-CC) for FCDI systems.
  • To investigate the impact of T-CC on charge transfer, ion transport, and overall desalination performance.
  • To assess the long-term stability and efficiency of the T-CC based FCDI system.

Main Methods:

  • Computational simulations were employed to study flow and electric fields with T-CC.
  • Electrochemical impedance spectroscopy (EIS) was used to analyze transport barriers and internal resistance.
  • Experimental testing of the T-CC based FCDI (T-FCDI) system under varying voltage and electrode solid content.

Main Results:

  • T-CC significantly reduced ion and charge transport barriers and internal resistance compared to conventional collectors.
  • T-FCDI demonstrated substantially higher average salt removal rates (ASRR) across tested voltages (1.0-2.0 V).
  • ASRR improved with increased solid content in flow electrodes, outperforming planar collectors.
  • Achieved 99.89% salt removal efficiency and maintained over 95% charge efficiency after 24 hours.

Conclusions:

  • The tip-array current collector (T-CC) is an effective design for enhancing FCDI performance.
  • T-CC improves charge and ion transport kinetics, leading to higher salt removal rates.
  • The T-FCDI system exhibits excellent efficiency and long-term operational stability for desalination applications.