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Vacancy Engineering for High-Efficiency Nanofluidic Osmotic Energy Generation
Javad Safaei1, Yifu Gao2, Mostafa Hosseinpour1
1Centre for Clean Energy Technology, School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, New South Wales2007, Australia.
Journal of the American Chemical Society
|January 18, 2023
Summary
Vacancy engineering in 2D nanofluidic membranes significantly boosts osmotic energy generation. This method enhances membrane selectivity, achieving a record power density for clean energy harvesting.
Area of Science:
- Materials Science
- Nanotechnology
- Energy Harvesting
Background:
- Two-dimensional (2D) nanofluidic membranes offer potential for osmotic energy generation.
- Low membrane permselectivity currently limits output power densities.
Purpose of the Study:
- To investigate vacancy engineering as a strategy for improving 2D nanofluidic membrane permselectivity.
- To achieve high-efficiency osmotic energy generation.
Main Methods:
- Creating phosphorus vacancies on niobium phosphate (NbOPO4) nanosheets (NbP).
- Characterizing vacancy-introduced NbP (V-NbP) using experimental and theoretical methods.
- Testing V-NbP membranes in a river water|seawater osmotic power generator.
Main Results:
- Vacancy engineering significantly increased the negative surface charge of NbP nanosheets.
- V-NbP membranes demonstrated fast transmembrane ion migration and high ionic selectivity.
- A record power density of 10.7 W m-2 was achieved, surpassing the commercial benchmark of 5.0 W m-2.
Conclusions:
- Vacancy engineering is an effective strategy to enhance permselectivity in 2D nanofluidic membranes.
- This approach holds significant potential for advancing nanofluidic energy devices.
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