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Type: Journal article
Title: The effect of hydrodynamic slip on membrane-based salinity-gradient-driven energy harvesting
Author: Rankin, D.
Huang, D.
Citation: Langmuir, 2016; 32(14):3420-3432
Publisher: American Chemical Society
Issue Date: 2016
ISSN: 0743-7463
Statement of
Daniel Justin Rankin and David Mark Huang
Abstract: The effect of hydrodynamic slip on salinity-gradient-driven power conversion by the process of reverse electrodialysis, in which the free energy of mixing of salt and fresh water across a nanoporous membrane is harnessed to drive an electric current in an external circuit, is investigated theoretically using a continuum fluid dynamics model. A general one-dimensional model is derived that decouples transport inside the membrane pores from the effects of electrical resistance at the pore ends, from which an analytical expression for the power conversion rate is obtained for a perfectly ion-selective membrane as a function of the slip length, surface charge density, membrane thickness, pore radius, and other membrane and electrolyte properties. The theoretical model agrees quantitatively with finite-element numerical calculations and predicts significant enhancements--up to several times--of salinity-gradient power conversion due to hydrodynamic slip for realistic systems.
Rights: © 2016 American Chemical Society
RMID: 0030046371
DOI: 10.1021/acs.langmuir.6b00433
Appears in Collections:Chemistry publications

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