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

Abstract : 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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https://hal.sorbonne-universite.fr/hal-01517523
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Submitted on : Wednesday, May 3, 2017 - 1:35:48 PM
Last modification on : Friday, October 30, 2020 - 2:40:03 PM
Long-term archiving on: : Friday, August 4, 2017 - 12:54:37 PM

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Si Qin, Dan Liu, Guang Wang, David Portehault, Christopher J. Garvey, et al.. High and Stable Ionic Conductivity in 2D Nanofluidic Ion Channels between Boron Nitride Layers. Journal of the American Chemical Society, American Chemical Society, 2017, 139 (18), pp.6314-6320. ⟨10.1021/jacs.6b11100⟩. ⟨hal-01517523⟩

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