Capacitive deionization (CDI) has been highlighted as a promising electrochemical water treatment system. However, the low deionization capacity of CDI electrodes has been a major limitation for its industrial application, and hence, there is a need for innovative electrode materials. In this study, we propose a high-performance hybrid CDI (HCDI) system by developing a Ag-coated activated carbon (AC) electrode. Ag particles were deposited on AC powder via a facile impregnation method. AC powders were dispersed in a AgNO₃ solution, followed by base treatment. The electrode prepared from the Ag-coated AC exhibited enhanced electrical capacity by the addition of Ag/AgCl electron transfer reaction. The HCDI system with Ag-coated AC showed a 43% higher deionization capacity than a conventional membrane CDI system. In addition, the deionization capacity of the HCDI system with Ag coated AC increased with the Ag loading on the AC. Moreover, the proposed HCDI system was capable of deionizing various cationic solutions (i.e., Na⁺, Mg²⁺, K⁺, Ca²⁺) demonstrating its potential to treat various sources of feed water (hard water, wastewater, etc.).

中文翻译：

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使用 Ag 涂层活性炭电极进行高性能混合电容去离子

电容去离子 (CDI) 已被强调为一种有前途的电化学水处理系统。然而，CDI电极的低去离子能力一直是其工业应用的主要限制，因此需要创新的电极材料。在这项研究中，我们通过开发 Ag 涂层活性炭 (AC) 电极提出了一种高性能混合 CDI (HCDI) 系统。Ag 颗粒通过简单的浸渍方法沉积在 AC 粉末上。AC 粉末分散在 AgNO ₃溶液，然后进行碱处理。通过添加Ag / AgCl电子转移反应，由Ag涂层AC制备的电极表现出增强的电容量。带有银涂层 AC 的 HCDI 系统显示出比传统膜 CDI 系统高 43% 的去离子能力。此外，带有 Ag 涂层 AC 的 HCDI 系统的去离子能力随着 AC 上的 Ag 负载而增加。此外，所提出的 HCDI 系统能够使各种阳离子溶液（即Na ⁺、Mg ²⁺、K ⁺、Ca ²⁺）去^离子，展示了其处理各种给水源（硬水、废水等）的潜力。