Optimizing Membranes for Osmotic Power Generation

The design of ion‐selective membranes is the key towards efficient reverse electrodialysis‐based osmotic power conversion. The tradeoff between ion selectivity (output voltage) and ion permeability (output current) in existing porous membranes, however, limits the upgradation of power generation eff...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2023-06, Vol.62 (26), p.e202303582-n/a
Main Authors: Chu, Chien‐Wei, Fauziah, Amalia Rizki, Yeh, Li‐Hsien
Format: Article
Language:English
Subjects:
Design
Design parameters
Electric power generation
Electrodialysis
Energy conversion efficiency
Fluidics
Ion Transport
Ion-Selective Membrane
Membrane permeability
Membranes
Nanofluidics
Nanofluids
Nanopore
Pore size
Salinity Gradient Power
Surface charge
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Summary:The design of ion‐selective membranes is the key towards efficient reverse electrodialysis‐based osmotic power conversion. The tradeoff between ion selectivity (output voltage) and ion permeability (output current) in existing porous membranes, however, limits the upgradation of power generation efficiency for practical applications. Thus, we provide the simple guidelines based on fundamentals of ion transport in nanofluidics for promoting osmotic power conversion. In addition, we discuss strategies for optimizing membrane performance through analysis of various material parameters in membrane design, such as pore size, surface charge, pore density, membrane thickness, ion pathway, pore order, and ionic diode effect. Lastly, a perspective on the future directions of membrane design to further maximize the efficiency of osmotic power conversion is outlined. The ion‐selective membrane is the key component in reverse electrodialysis‐based osmotic power harvesting techniques. This Minireview provides an overview of the balance between ion selectivity (voltage) and ion permeability (current) in osmotic ion transport and offers a set of design guidelines for material parameters to optimize membrane performance to maximize osmotic power generation.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202303582