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

Author

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  • Sang Woo Lee

    (Department of Mechanical Engineering, Ajou University, Suwon 443-749, Korea)

  • Hyun Jung Kim

    (Department of Mechanical Engineering, Ajou University, Suwon 443-749, Korea)

  • Dong-Kwon Kim

    (Department of Mechanical Engineering, Ajou University, Suwon 443-749, Korea)

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/m 2 . 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/m 2 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.

Suggested Citation

  • Sang Woo Lee & Hyun Jung Kim & Dong-Kwon Kim, 2016. "Power Generation from Concentration Gradient by Reverse Electrodialysis in Dense Silica Membranes for Microfluidic and Nanofluidic Systems," Energies, MDPI, vol. 9(1), pages 1-11, January.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:1:p:49-:d:62233
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    References listed on IDEAS

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    1. Kim, Juwan & Kim, Sung Jin & Kim, Dong-Kwon, 2013. "Energy harvesting from salinity gradient by reverse electrodialysis with anodic alumina nanopores," Energy, Elsevier, vol. 51(C), pages 413-421.
    2. Kang, Byeong Dong & Kim, Hyun Jung & Lee, Moon Gu & Kim, Dong-Kwon, 2015. "Numerical study on energy harvesting from concentration gradient by reverse electrodialysis in anodic alumina nanopores," Energy, Elsevier, vol. 86(C), pages 525-538.
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    Cited by:

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    2. Wang, Y. & Wang, H. & Wan, C.Q., 2018. "The effect of colloids on nanofluidic power generation," Energy, Elsevier, vol. 160(C), pages 863-867.

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