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首页> 外文期刊>Environmental Science & Technology >Enhancing the Ion-Size-Based Selectivity of Capacitive Deionization Electrodes
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Enhancing the Ion-Size-Based Selectivity of Capacitive Deionization Electrodes

机译：增强电容去离子电极的离子尺寸的选择性

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摘要

Capacitive deionization (CDI) is an emerging water treatment technology often applied to brackish water desalination and water softening. Typical CDI cells consist of two microporous carbon electrodes sandwiching a dielectric separator, and desalt feedwater flowing through the cell by storing ions in electric double layers (EDLs) within charged micropores. CDI cells have demonstrated size-based ion selectivity wherein smaller hydrated ions are preferentially electrosorbed over larger hydrated ions. We demonstrate that such size-based selectivity can be substantially enhanced through the addition of chemical charge to micropores via surface functionalization. We develop a micropore EDL theory that includes both finite ion size effects and micropore chemical charge, which predicts such enhancements and elucidates that they result denser counterion packing micropores. With our experimental CDI cell, we desalted an electrolyte consisting of equimolar potassium (K+) and lithium (Li+) ions. We show that use of a surface-functionalized (oxidized) cathode significantly increased the electrosorption ratio of smaller K+ to larger Li+ compared to a cell with a pristine cathode, for example, from to similar to 1 to 1.84 for a charging voltage of 0.4 V. Our model predicts yet-higher electrosorption ratios are attainable, but our experimental cell suffered from significant cathode chemical charge degradation at applied voltages of similar to 1 V.
机译：电容去离子化（CDI）是一种新兴水处理技术，通常应用于咸水脱盐和水软化。典型的CDI电池包括夹在电介质分离器的两个微孔碳电极，以及通过在带电微孔内的电双层（EDL）中的离子存储在电池中流过电池的脱墨水。 CDI细胞已经证明了基于尺寸的离子选择性，其中较小的水合离子优先在较大的水合离子上过吸收。我们证明通过对微孔通过表面官能化向微孔添加化学电量，可以基本上增强这种基于尺寸的选择性。我们开发了一种微孔EDL理论，包括有限的离子尺寸效应和微孔化学电荷，这预测​​了这种增强，并阐明了它们导致更密集的抗衡箱包装微孔。通过我们的实验CDI细胞，我们脱沉将由等摩尔钾（K +）和锂（Li +）离子组成的电解质。我们表明，与具有原始阴极的电池相比，使用表面官能化（氧化）阴极的使用显着增加了更小的K +至较大Li +的吸收比，例如，对于0.4V的充电电压，与1至1.84相似。我们的模型预测更高的吸收测量比是可获得的，但我们的实验细胞在类似于1V的施加电压下患有显着的阴极化学电荷劣化。

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  • 来源
    《Environmental Science & Technology》 |2019年第14期|8447-8454|共8页
  • 作者

    Guyes Eric N.; Malka Tahel; Suss Matthew E.;

  • 作者单位

    Technion Israel Inst Technol Fac Mech Engn IL-3200003 Haifa Israel;

    Technion Israel Inst Technol Fac Chem Engn IL-3200003 Haifa Israel;

    Technion Israel Inst Technol Fac Mech Engn IL-3200003 Haifa Israel;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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