Abstract Capacitive deionization (CDI) has emerged as a novel desalination technology due to its cleanliness and low energy consumption. Despite being based on the principle of an electric double layer for ion adsorption on porous carbon materials, the inevitable faradaic reaction and the existence of co-ion repulsion reduce the charge efficiency (CE), leading to a low salt adsorption capacity (SAC). Herein, an integrated membrane electrode (IME), prepared by spray-coating a thin layer of an ion exchange polymer on the activated carbon (AC) electrode, effectively improves the selectivity of the electrode to the counter-ion, resulting in a high CE and high SAC with good stability. The results show that the CE of CDI performed using IMEs is between 70% and 98% during multiple adsorption-desorption cycles, and the SAC is up to 14–20 mg g−1, which is much higher than CE (35–65%) and SAC (7–13 mg g−1) of traditional CDI with pristine AC electrodes. This study indicates that CDI using IMEs is advantageous for desalination with great application potential.

中文翻译：

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通过在活性炭电极上薄层喷涂离子交换聚合物来增强集成膜电极的电容去离子

摘要 电容去离子（CDI）因其清洁度高、能耗低而成为一种新型的海水淡化技术。尽管基于多孔碳材料上离子吸附的双电层原理，不可避免的法拉第反应和共离子排斥的存在降低了电荷效率（CE），导致盐吸附容量（SAC）低。在此，通过在活性炭 (AC) 电极上喷涂薄层离子交换聚合物制备的集成膜电极 (IME) 有效提高了电极对反离子的选择性，从而获得高 CE SAC高，稳定性好。结果表明，在多次吸附-解吸循环中，使用 IME 进行的 CDI 的 CE 介于 70% 和 98% 之间，SAC 高达 14-20 mg g-1，这远高于具有原始 AC 电极的传统 CDI 的 CE (35-65%) 和 SAC (7-13 mg g-1)。该研究表明，使用 IME 的 CDI 有利于海水淡化，具有巨大的应用潜力。