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High and Stable Ionic Conductivity in 2D Nanofluidic Ion Channels between Boron Nitride Layers
Journal article   Open access

High and Stable Ionic Conductivity in 2D Nanofluidic Ion Channels between Boron Nitride Layers

Si Qin, Dan Liu, Guang Wang, David Portehault, Christopher J Garvey, Yury Gogotsi, Weiwei Lei and Ying Chen
Journal of the American Chemical Society, v 139(18), p6320
2017
DOI: https://doi.org/10.1021/jacs.6b11100
PMID: 28418247
url
https://doi.org/10.1021/jacs.6b11100View
Published, Version of Record (VoR) Open

Abstract

Material chemistry Chemical Sciences
Achieving a high rate of ionic transport through porous membranes and ionic channels is important in numerous applications ranging from energy storage to water desalination, but still remains a challenge. Herein we show that ions can quickly pass through interlayer spaces in hydrated boron nitride (BN) membranes. Measurements of surface-charge governed ionic currents through BN conduits in a variety of salt solutions (KCl, NaCl and CaCl 2) at low salt concentrations (<10-4 M) showed several orders of magnitude higher ionic conductivity compared to the bulk solution. Moreover , due to the outstanding chemical and thermal stability of BN, the ionic conduits remain fully functional at temperatures up to 90°C. The BN conduits can operate in acidic and basic environments, and do not degrade after immersing in solutions with extreme pH (pH~0 or 14) for one week. Those excellent properties make the BN ionic conduits attractive for applications in nanofluidic devices and membrane separation.

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Chemistry, Multidisciplinary
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