Zhu Tianhao, Kong Yan, Lyu Bohui, Cao Li, Shi Benbing, Wang Xiaoyao, Pang Xiao, Fan Chunyang, Yang Chao, Wu Hong, Jiang Zhongyi
Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China.
Haihe Laboratory of Sustainable Chemical Transformations, Tianjin, 300072, China.
Nat Commun. 2023 Sep 22;14(1):5926. doi: 10.1038/s41467-023-41555-5.
3D ionic covalent organic framework (COF) membranes, which are envisioned to be able to break the trade-off between ion conductivity and ion selectivity, are waiting for exploitation. Herein, we report the fabrication of a 3D sulfonic acid-functionalized COF membrane (3D SCOF) for efficient and selective ion transport, using dual acid-mediated interfacial polymerization strategy. The 3D SCOF membranes possess highly interconnected ion transport channels, ultramicroporous pore sizes (0.97 nm), and abundant sulfonate groups (with a high ion exchange capacity of 4.1 mmol g), leading to high proton conductivity of 843 mS cm at 90 °C. When utilized in osmotic energy conversion, a high power density of 21.2 W m, and a remarkable selectivity of 0.976 and thus an exceptional energy conversion efficiency of 45.3% are simultaneously achieved. This work provides an alternative approach to 3D ionic COF membranes and promotes the applications of 3D COFs in ion transport and separation.
三维离子共价有机框架（COF）膜有望打破离子电导率和离子选择性之间的权衡，目前仍有待开发。在此，我们报道了一种用于高效和选择性离子传输的三维磺酸功能化COF膜（3D SCOF）的制备，采用双酸介导的界面聚合策略。3D SCOF膜具有高度互连的离子传输通道、超微孔尺寸（0.97纳米）和丰富的磺酸基团（离子交换容量高达4.1毫摩尔/克），在90°C时导致843毫西门子/厘米的高质子电导率。当用于渗透能转换时，同时实现了21.2瓦/平方米的高功率密度、0.976的显著选择性以及45.3%的卓越能量转换效率。这项工作为三维离子COF膜提供了一种替代方法，并促进了三维COF在离子传输和分离中的应用。
