Polyoxometalate-based plasmonic electron sponge membrane for nanofluidic osmotic energy conversion

Chengcheng Zhu, Li Xu, Yazi Liu, Jiang Liu, Jin Wang, Hanjun Sun, Ya-Qian Lan () and Chen Wang ()
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Chengcheng Zhu: School of Chemistry and Materials Science, Nanjing Normal University
Li Xu: School of Chemistry and Materials Science, Nanjing Normal University
Yazi Liu: Jiangsu Engineering Lab of Water and Soil Eco-remediation, Nanjing Normal University
Jiang Liu: South China Normal University
Jin Wang: School of Chemistry and Materials Science, Nanjing Normal University
Hanjun Sun: School of Chemistry and Materials Science, Nanjing Normal University
Ya-Qian Lan: School of Chemistry and Materials Science, Nanjing Normal University
Chen Wang: School of Chemistry and Materials Science, Nanjing Normal University

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

Abstract: Abstract Nanofluidic membranes have demonstrated great potential in harvesting osmotic energy. However, the output power densities are usually hampered by insufficient membrane permselectivity. Herein, we design a polyoxometalates (POMs)-based nanofluidic plasmonic electron sponge membrane (PESM) for highly efficient osmotic energy conversion. Under light irradiation, hot electrons are generated on Au NPs surface and then transferred and stored in POMs electron sponges, while hot holes are consumed by water. The stored hot electrons in POMs increase the charge density and hydrophilicity of PESM, resulting in significantly improved permselectivity for high-performance osmotic energy conversion. In addition, the unique ionic current rectification (ICR) property of the prepared nanofluidic PESM inhibits ion concentration polarization effectively, which could further improve its permselectivity. Under light with 500-fold NaCl gradient, the maximum output power density of the prepared PESM reaches 70.4 W m−2, which is further enhanced even to 102.1 W m−2 by changing the ligand to P5W30. This work highlights the crucial roles of plasmonic electron sponge for tailoring the surface charge, modulating ion transport dynamics, and improving the performance of nanofluidic osmotic energy conversion.

Date: 2024
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DOI: 10.1038/s41467-024-48613-6

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