Light‐Enhanced Osmotic Energy Harvester Using Photoactive Porphyrin Metal–Organic Framework Membranes

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 t...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2022-05, Vol.61 (22), p.e202202698-n/a
Main Authors: Li, Zhong‐Qiu, Zhu, Guan‐Long, Mo, Ri‐Jian, Wu, Ming‐Yang, Ding, Xin‐Lei, Huang, Li‐Qiu, Wu, Zeng‐Qiang, Xia, Xing‐Hua
Format: Article
Language:English
Subjects:
Aluminum
Aluminum oxide
Cathodic Deposition
Energy
Energy harvesting
Enhanced Osmotic Energy Conversion
Irradiation
Ligands
Light irradiation
Light Response
Membrane permeability
Membranes
Metal-organic frameworks
Metal-Organic Frameworks - chemistry
Permeability
Porosity
Porphyrins
Selectivity
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Summary: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−2 is achieved. The photoactive porphyrin ligands further lead to an improvement of the power density to 7.74 W m−2 upon light irradiation. This work provides a promising strategy for the design of high‐performance osmotic energy harvesting systems. A porphyrin metal–organic framework membrane has been fabricated by a facile cathodic deposition method. The high ion selectivity and permeability endow the MOF membrane with a great performance in osmotic energy harvesting, and this performance can be further improved by the photoactive porphyrin ligands upon light irradiation.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202202698