journal article·2022-01-12

Unconventional Dual Ion Selectivity Determined by the Forward Side of a Bipolar Channel toward Ion Flux

Chao Li, Pengxiang Liu, Yi Zhai, Liqian Yao, Hu Lin, Longcheng Gao, Lei Jiang

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Abstract

Ion selectivity is an essential property of ion-selective membranes (ISMs). To date, all of the artificial ISMs have been reported to exhibit sole ion selectivity (SIS), either cation or anion selectivity. Here, we first demonstrate unconventional dual ion selectivity (DIS) in a bipolar channel membrane determined by the forward side toward ion flux. When the bipolar membrane meets the conditions of opposite ion selectivities and comparable resistance for both constructive layers, no matter which layer faces the ion flux, it functions as a selective layer and determines the selectivity of the whole membrane. The exploration of the unconventional DIS property inspires us to fabricate a new generation of ISMs, as well as other membranes for separation.
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Research context

OpenAlex topics: Fuel Cells and Related Materials · Membrane-based Ion Separation Techniques · Nanopore and Nanochannel Transport Studies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, P. R. China

Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China

School of Future Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China

Funding

Ministry of Science and Technology of the People's Republic of China · Central University Basic Research Fund of China · National Natural Science Foundation of China

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