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Issue 9, 2014
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Overlimiting current through ion concentration polarization layer: hydrodynamic convection effects

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Abstract

In this work, we experimentally investigated an effect of the hydrodynamic convective flow on ion transport through a nanoporous membrane in a micro/nanofluidic modeled system. The convective motion of ions in an ion concentration polarization (ICP) layer was controlled by external hydrodynamic inflows adjacent to the nanoporous membrane. The ion depletion region, which is regarded as a high electrical resistance, was spatially confined to a triangular shape with the additional hydrodynamic convective flow, resulting in a significant alteration in the classical ohmic–limiting–overlimiting current characteristics. Furthermore, the extreme spatial confinement can completely eliminate the limiting current region at a higher flow rate, while the ICP layer still exists. The presented results enable one to obtain a high current value which turns out to be a high electrical power efficiency. Therefore, this mechanism could be utilized as an optimizing power consumption strategy for various electrochemical membrane systems such as fuel-cells, electro-desalination systems and nanofluidic preconcentrators, etc.

Graphical abstract: Overlimiting current through ion concentration polarization layer: hydrodynamic convection effects

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Publication details

The article was received on 17 Sep 2013, accepted on 11 Jan 2014 and first published on 20 Jan 2014


Article type: Paper
DOI: 10.1039/C3NR04961B
Nanoscale, 2014,6, 4620-4626

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    Overlimiting current through ion concentration polarization layer: hydrodynamic convection effects

    I. Cho, G. Y. Sung and S. J. Kim, Nanoscale, 2014, 6, 4620
    DOI: 10.1039/C3NR04961B

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