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Cation-selective two-dimensional polyimine membranes for high-performance osmotic energy conversion

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.

Identiferoai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:89413
Date22 April 2024
CreatorsZhang, Zhen, Bhauriyal, Preeti, Sahabudeen, Hafeesudeen, Wang, Zhiyong, Liu, Xiaohui, Hambsch, Mike, Mannsfeld, Stefan C. B., Dong, Renhao, Heine, Thomas, Feng, Xinliang
PublisherNature Publishing Group
Source SetsHochschulschriftenserver (HSSS) der SLUB Dresden
LanguageEnglish
Detected LanguageEnglish
Typeinfo:eu-repo/semantics/publishedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text
Rightsinfo:eu-repo/semantics/openAccess
Relation2041-1723, 3935, 10.1038/s41467-022-31523-w, info:eu-repo/grantAgreement/Europäische Union/H2020 | SGA-RIA/ 881603//Graphene Flagship Core Project 3/GrapheneCore3, info:eu-repo/grantAgreement/European Commission/H2020 | ERC | ERC-STG/852909//Development of Functional Conjugated Two-Dimensional Metal-Organic Frameworks/FC2DMOF, info:eu-repo/grantAgreement/Europäische Union/H2020 | RIA/730872//Convenient Access to Light Sources Open to Innovation, Science and to the World/ CALIPSOplus

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