Li Zhong-Qiu, Zhu Guan-Long, Mo Ri-Jian, Wu Ming-Yang, Ding Xin-Lei, Huang Li-Qiu, Wu Zeng-Qiang, Xia Xing-Hua
State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China.
Angew Chem Int Ed Engl. 2022 May 23;61(22):e202202698. doi: 10.1002/anie.202202698. Epub 2022 Mar 29.
High ion selectivity and permeability, as two contradictory aspects for the membrane design, highly hamper the development of osmotic energy harvesting technologies. Metal-organic frameworks (MOFs) with ultra-small and high-density pores and functional surface groups show great promise in tackling these problems. Here, we propose a facile and mild cathodic deposition method to directly prepare crack-free porphyrin MOF membranes on a porous anodic aluminum oxide for osmotic energy harvesting. The abundant carboxyl groups of the functionalized porphyrin ligands together with the nanoporous structure endows the MOF membrane with high cation selectivity and ion permeability, thus a large output power density of 6.26 W m is achieved. The photoactive porphyrin ligands further lead to an improvement of the power density to 7.74 W m upon light irradiation. This work provides a promising strategy for the design of high-performance osmotic energy harvesting systems.
高离子选择性和渗透性是膜设计中相互矛盾的两个方面，严重阻碍了渗透能收集技术的发展。具有超小且高密度孔隙以及功能性表面基团的金属有机框架（MOF）在解决这些问题方面显示出巨大潜力。在此，我们提出一种简便温和的阴极沉积方法，直接在多孔阳极氧化铝上制备无裂纹的卟啉MOF膜用于渗透能收集。功能化卟啉配体丰富的羧基与纳米多孔结构赋予了MOF膜高阳离子选择性和离子渗透性，从而实现了6.26 W m的高输出功率密度。光活性卟啉配体在光照下进一步将功率密度提高到7.74 W m。这项工作为高性能渗透能收集系统的设计提供了一种有前景的策略。
