使用氧化还原活性醌改进流动和固定电容去离子的脱盐性能,ACS Sustainable Chemistry & Engineering

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使用氧化还原活性醌改进流动和固定电容去离子的脱盐性能
ACS Sustainable Chemistry & Engineering ( IF 8.4 ) Pub Date : 2020-10-26 , DOI: 10.1021/acssuschemeng.0c06651
Nguyen Anh Thu Tran ₁ , Ngo Minh Phuoc ₁ , Hana Yoon ₂ , Euiyeon Jung ₃ , Young-Woo Lee ₁ , Beom-Goo Kang ₄ , Hong Suk Kang ₅ , Chung-Yul Yoo ₆ , Younghyun Cho ₁

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电容去离子（CDI）由于其能量和成本效益而成为一种脱盐技术。特别是，即使在微咸水和海水中的盐浓度下，使用流量电极（FCDI）进行的CDI也可通过连续脱盐显着提高脱盐率。由于CDI主要利用盐离子在电极上的双电层上的电吸附作用，碳材料及其衍生物已被广泛使用。即使采用各种方法，包括新型碳基电极材料的改性和合成，CDI和FCDI的除盐能力仍然受到碳电极可及的表面积和电荷转移性质的限制。对苯二酚（HQ）是一种具有氧化还原活性的有机分子，在电化学反应中具有高度可逆的特性，是一种低成本且无毒的材料。在这项研究中，我们在用于CDI和FCDI脱盐系统的活性炭（AC）电极中引入了醌。它的除盐性能显着提高（对于CDI，对于300 mM总部，增长超过65％，对于FCDI，对于500 mM HQ，增长超过19％）。即使由于小HQ分子渗透到AC表面的孔中而减少了添加HQ的AC电极的比表面积，HQ和苯醌（BQ）的假电容作用也提高了除盐性能。我们通过使用循环伏安法和电化学阻抗谱分析了这种电化学性质。

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Improved Desalination Performance of Flow- and Fixed-Capacitive Deionization using Redox-Active Quinone

Capacitive deionization (CDI) has newly emerged as a desalination technology because of its energy and cost-effectiveness. In particular, CDI using a flow electrode (FCDI) significantly increased salt removal by continuous desalination even at salt concentrations of both brackish and seawater. Since CDI mainly uses the electrosorption of salt ions onto an electric double layer on electrodes, carbon materials and their derivatives have been widely used. Even with various approaches, including modification and synthesis of new carbon-based electrode materials, the salt-removal capacity of CDI and FCDI is still limited by the accessible surface area and charge-transfer properties of carbon electrodes. Hydroquinone (HQ) is a redox-active organic molecule with highly reversible properties in electrochemical reactions and is a low-cost and non-toxic material. In this study, we introduced quinone in the activated carbon (AC) electrodes for CDI and FCDI desalination systems. It exhibited a significant increase in salt-removal performance (for CDI, more than a 65% increase for 300 mM HQ, and for FCDI, more than a 19% increase for 500 mM HQ). Even though the specific surface area of an HQ-added AC electrode is reduced because of the penetration of small HQ molecules into pores in the AC surface, the pseudocapacitive contribution from HQ and benzoquinone (BQ) increased the salt-removal performance. We analyzed such electrochemical properties by using cyclic voltammetry and electrochemical impedance spectroscopy. We expect that such an approach will open a new door for realizing excellent deionization of saline water, even of seawater, and will have a strong potential for large-scale desalination and energy-storage systems.

更新日期：2020-11-09

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