Ren Li, Zhou Jiemei, Xiong Sen, Wang Yong
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, Jiangsu 211816, P. R. China.
Langmuir. 2020 Oct 13;36(40):12030-12037. doi: 10.1021/acs.langmuir.0c02405. Epub 2020 Oct 1.
Capacitive deionization (CDI) is an energy-efficient and environmentally friendly electrochemical desalination technology which has attracted increasing attention in recent years. Electrodes are crucial to the performance of CDI processes, and utilizing a carbon-nanotubes (CNTs) membrane to fabricate electrodes is an attractive solution for advanced CDI processes. However, the strong hydrophobicity and low electrosorption capacity limit applications of CNTs membranes in CDI. To solve this problem, we introduce crystalline porous covalent organic frameworks (COFs) into CNTs membranes to fabricate N-doping carbon-nanotubes membrane electrodes (NCMEs). After solvothermal growth and carbonization, CNTs membranes are successfully coated with imine-based COFs and turned into integrated NCMEs. Comparing with the CNTs membranes, the NCMEs exhibit an ∼2.3 times higher electrosorption capacity and superior reusability. This study not only confirms that COFs can be used as high-quality carbon sources but also provides a new strategy to fabricate high-performance CDI electrodes.
电容去离子化（CDI）是一种节能且环保的电化学脱盐技术，近年来受到越来越多的关注。电极对于CDI过程的性能至关重要，利用碳纳米管（CNT）膜制备电极是先进CDI过程的一种有吸引力的解决方案。然而，强疏水性和低电吸附容量限制了CNT膜在CDI中的应用。为了解决这个问题，我们将结晶多孔共价有机框架（COF）引入CNT膜中，以制备氮掺杂碳纳米管膜电极（NCME）。经过溶剂热生长和碳化后，CNT膜成功地被亚胺基COF包覆，变成了一体化的NCME。与CNT膜相比，NCME的电吸附容量高出约2.3倍，并且具有优异的可重复使用性。这项研究不仅证实了COF可以用作高质量的碳源，还提供了一种制备高性能CDI电极的新策略。
