Battery Electrode Materials with Omnivalent Cation Storage for Fast and Charge‐Efficient Ion Removal of Asymmetric Capacitive Deionization,Advanced Functional Materials

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Battery Electrode Materials with Omnivalent Cation Storage for Fast and Charge‐Efficient Ion Removal of Asymmetric Capacitive Deionization
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-07-11 , DOI: 10.1002/adfm.201802665
Seungyeon Choi ₁ , Barsa Chang ₁ , Seoni Kim ₁ , Jiho Lee ₁ , Jeyong Yoon ₁ , Jang Wook Choi ₁

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Capacitive deionization (CDI) that engages porous carbon electrodes constitutes one of the well‐established energy‐efficient desalination methods. However, improvement in desalination performance, including ion removal capacity, ion removal rate, and charge efficiency remains requisite for a wide range of applications. Herein, an ion‐exchange membrane‐free asymmetric CDI is introduced by pairing a metal organic framework (MOF), namely, K_0.03Cu[Fe(CN)₆]_0.65·0.43H₂O and porous carbon. The exclusive intercalation of cations into the MOF prevents the reverse adsorption of co‐ions (anions), thus significantly improving ion removal capacity (23.2 mg g⁻¹) and charge efficiency (75.8%). Moreover, by utilizing the advantage of the MOF that diverse mono‐ and divalent cations can be stored in the narrow redox potential range, the asymmetric CDI allows simultaneous capture of mono‐ and divalent cations, thus achieving omnivalent cation removal. Moreover, cations are intercalated in the hydrated forms without a discrete phase transition of the host structure, facilitating rapid desalination by reducing the desolvation energy penalty, which results in a high ion removal rate of 0.24 mg g⁻¹ s⁻¹. This study offers a new design principle in CDI: the integration of a crystal structure with large ionic channels that enable hydrated intercalation of multivalent ions in a fast and exclusive manner.

中文翻译：

具有全价阳离子存储功能的电池电极材料，可快速且高效充电地去除不对称电容去离子

与多孔碳电极接合的电容去离子（CDI）构成了行之有效的高能效淡化方法之一。然而，包括多种离子去除能力，离子去除速率和电荷效率在内的脱盐性能的改善仍然是广泛应用所必需的。在此，通过将金属有机骨架（MOF），即K _0.03 Cu [Fe（CN）₆ ] _0.65 ·0.43H ₂ O与多孔碳配对，引入了无离子交换膜的不对称CDI 。阳离子向MOF中的唯一嵌入可防止共离子（阴离子）的反向吸附，从而显着提高离子去除能力（23.2 mg g ^-1）和充电效率（75.8％）。此外，通过利用MOF的优势，可以在狭窄的氧化还原电位范围内存储各种一价和二价阳离子，不对称CDI可以同时捕获一价和二价阳离子，从而实现了全价阳离子的去除。此外，阳离子以水合形式插入而没有主体结构的离散相变，从而通过减少去溶剂能损失而促进快速脱盐，这导致0.24 mg g ^-1 s ^-1的高离子去除率。这项研究为CDI提供了一种新的设计原理：将晶体结构与大型离子通道集成在一起，从而能够以快速，排他的方式水合嵌入多价离子。

更新日期：2018-07-11

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