Cation-selective two-dimensional polyimine membranes for high-performance osmotic energy conversion
Zhang Z, Bhauriyal P, Sahabudeen H, Wang Z, Liu X, Hambsch M, Mannsfeld SCB, Dong R, Heine T, Feng X (2022)
Publication Type: Journal article
Publication year: 2022
Journal
Book Volume: 13
Article Number: 3935
Journal Issue: 1
DOI: 10.1038/s41467-022-31523-w
Abstract
Two-dimensional (2D) membranes are emerging candidates for osmotic energy conversion. However, the trade-off between ion selectivity and conductivity remains the key bottleneck. Here we demonstrate a fully crystalline imine-based 2D polymer (2DPI) membrane capable of combining excellent ionic conductivity and high selectivity for osmotic energy conversion. The 2DPI can preferentially transport cations with Na+ selectivity coefficient of 0.98 (Na+/Cl− selectivity ratio ~84) and K+ selectivity coefficient of 0.93 (K+/Cl− ratio ~29). Moreover, the nanometer-scale thickness (~70 nm) generates a substantially high ionic flux, contributing to a record power density of up to ~53 W m−2, which is superior to most of nanoporous 2D membranes (0.8~35 W m−2). Density functional theory unveils that the oxygen and imine nitrogen can both function as the active sites depending on the ionization state of hydroxyl groups, and the enhanced interaction of Na+ versus K+ with 2DPI plays a significant role in directing the ion selectivity.
Involved external institutions
Germany (DE)How to cite
APA:
Zhang, Z., Bhauriyal, P., Sahabudeen, H., Wang, Z., Liu, X., Hambsch, M.,... Feng, X. (2022). Cation-selective two-dimensional polyimine membranes for high-performance osmotic energy conversion. Nature Communications, 13(1). https://doi.org/10.1038/s41467-022-31523-w
MLA:
Zhang, Zhen, et al. "Cation-selective two-dimensional polyimine membranes for high-performance osmotic energy conversion." Nature Communications 13.1 (2022).
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