Free‐Standing Covalent Organic Framework Membrane for High‐Efficiency Salinity Gradient Energy Conversion

Both high ionic conductivity and selectivity of a membrane are required for efficient salinity gradient energy conversion. An efficient method to improve energy conversion is to align ionic transport along the membrane thickness to address low ionic conductivity in traditional membranes used for ene...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2021-04, Vol.60 (18), p.9925-9930
Main Authors: Hou, Shuhua, Ji, Wentao, Chen, Jianjun, Teng, Yunfei, Wen, Liping, Jiang, Lei
Format: Article
Language:English
Subjects:
aligning ionic transport
Artificial seawater
Charge density
Conductivity
Covalence
Dimensional stability
Energy
Energy conversion
Energy conversion efficiency
Energy harvesting
Ion currents
Ions
Mechanical properties
Membranes
Nanochannels
Rivers
Salinity
Salinity effects
salinity gradient energy
Seawater
Selectivity
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Summary:Both high ionic conductivity and selectivity of a membrane are required for efficient salinity gradient energy conversion. An efficient method to improve energy conversion is to align ionic transport along the membrane thickness to address low ionic conductivity in traditional membranes used for energy harvesting. We fabricated a free‐standing covalent organic framework membrane (TpPa‐SO3H) with excellent stability and mechanical properties. This membrane with one‐dimensional nanochannels and high charge density demonstrated high ionic conductivity and selectivity. Its power density reached up to 5.9 W m−2 by mixing artificial seawater and river water. Based on our results, we attribute the high energy conversion to the high ion conductivity through aligned one‐dimensional nanochannels and high ion selectivity via the size of the nanochannel at ≈1 nm in the membrane. This study paves the way for designing covalent organic framework membranes for high salinity gradient energy conversion. Free‐standing covalent‐organic‐framework‐based membranes with excellent stability and mechanical properties were fabricated. The membranes have one‐dimensional nanochannels for ion transport and they exhibit high conductivity and selectivity. The membranes demonstrated efficient salinity gradient energy conversion, which highlights the potential of covalent organic frameworks in energy harvesting.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202100205