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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.
Highlights
Energy sources are increasingly important for nanofluidic and microfluidic systems that are used in applications such as environmental monitoring with wireless sensor networks and implantable medical devices [1]
2016, 9, 49 the conditions under which these densities are achieved, are unclear. This lack of clarity is due to nanofluidic and microfluidic devices. This led us to investigate the potential of dense silica the fact that, to the best of our knowledge, there have been no previous studies focused on power membrane for the use in reverse electrodialysis systems
We investigated electrodialysis in aindense silica membrane that that was was between two
Summary
Energy sources are increasingly important for nanofluidic and microfluidic systems that are used in applications such as environmental monitoring with wireless sensor networks and implantable medical devices [1]. Gibbs free energy of mixing can be converted to electrical energy for nanofluidic and and numerically investigated the electrokinetic energy conversion in short‐length nanofluidic channels, taking into account reservoir resistance and concentration polarization effects [9] These studies microfluidic systems using inorganic membranes. This lack of clarity is due to nanofluidic and microfluidic devices This led us to investigate the potential of dense silica the fact that, to the best of our knowledge, there have been no previous studies focused on power membrane for the use in reverse electrodialysis systems. The silica densities achieved, by are depositing unclear This lack of clarity is due fact that, to the best of our knowledge, membrane was are fabricated a silica layer on toa the porous alumina substrate via chemical there have been no previous studies focused on power generation by reverse electrodialysis in a vapor deposition.
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