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Energies 2016, 9(1), 49; doi:10.3390/en9010049

Power Generation from Concentration Gradient by Reverse Electrodialysis in Dense Silica Membranes for Microfluidic and Nanofluidic Systems

Department of Mechanical Engineering, Ajou University, Suwon 443-749, Korea
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Author to whom correspondence should be addressed.
Academic Editor: Ling Bing Kong
Received: 28 October 2015 / Revised: 22 December 2015 / Accepted: 12 January 2016 / Published: 15 January 2016
(This article belongs to the Special Issue Waste Energy Harvesting)
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Abstract

In this study, we investigate power generation by reverse electrodialysis in a dense silica membrane that is between two NaCl solutions with various combinations of concentrations. Each silica membrane is fabricated by depositing a silica layer on a porous alumina substrate via chemical vapor deposition. The measured potential-current (V-I) characteristics of the silica membrane are used to obtain the transference number, diffusion potential, and electrical resistance. We develop empirical correlations for the transference number and the area-specific resistance, and present the results of power generation by reverse electrodialysis using the fabricated silica membranes. The highest measured power density is 0.98 mW/m2. In addition, we develop a contour map of the power density as a function of NaCl concentrations on the basis of the empirical correlations. The contour map shows that a power output density of 1.2 mW/m2 is achievable with the use of silica membranes and is sufficient to drive nanofluidic and microfluidic systems. The dense silica membrane has the potential for use in micro power generators in nanofluidic and microfluidic systems. View Full-Text
Keywords: power generation; reverse electrodialysis; silica membrane; concentration gradient power generation; reverse electrodialysis; silica membrane; concentration gradient
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lee, S.W.; Kim, H.J.; Kim, D.-K. Power Generation from Concentration Gradient by Reverse Electrodialysis in Dense Silica Membranes for Microfluidic and Nanofluidic Systems. Energies 2016, 9, 49.

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