Light-responsive and ultrapermeable two-dimensional metal-organic framework membrane for efficient ionic energy harvesting

Jin Wang (), Zeyuan Song, Miaolu He, Yongchao Qian, Di Wang, Zheng Cui, Yuan Feng, Shangzhen Li, Bo Huang, Xiangyu Kong (), Jinming Han and Lei Wang ()
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Jin Wang: Xi’an University of Architecture and Technology
Zeyuan Song: Xi’an University of Architecture and Technology
Miaolu He: Xi’an University of Architecture and Technology
Yongchao Qian: Chinese Academy of Sciences
Di Wang: Xi’an University of Architecture and Technology
Zheng Cui: Xi’an University of Architecture and Technology
Yuan Feng: Xi’an University of Architecture and Technology
Shangzhen Li: Xi’an University of Architecture and Technology
Bo Huang: Xi’an Jiaotong University
Xiangyu Kong: Chinese Academy of Sciences
Jinming Han: Xi’an University of Architecture and Technology
Lei Wang: Xi’an University of Architecture and Technology

Nature Communications, 2024, vol. 15, issue 1, 1-13

Abstract: Abstract Nanofluidic membranes offer exceptional promise for osmotic energy conversion, but the challenge of balancing ionic selectivity and permeability persists. Here, we present a bionic nanofluidic system based on two-dimensional (2D) copper tetra-(4-carboxyphenyl) porphyrin framework (Cu-TCPP). The inherent nanoporous structure and horizontal interlayer channels endow the Cu-TCPP membrane with ultrahigh ion permeability and allow for a power density of 16.64 W m−2, surpassing state of-the-art nanochannel membranes. Moreover, leveraging the photo-thermal property of Cu-TCPP, light-controlled ion active transport is realized even under natural sunlight. By combining solar energy with salinity gradient, the driving force for ion transport is reinforced, leading to further improvements in energy conversion performance. Notably, light could even eliminate the need for salinity gradient, achieving a power density of 0.82 W m−2 in a symmetric solution system. Our work introduces a new perspective on developing advanced membranes for solar/ionic energy conversion and extends the concept of salinity energy to a notion of ionic energy.

Date: 2024
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DOI: 10.1038/s41467-024-46439-w

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