Electrokinetic Hydrogen Generation from Liquid WaterMicrojets

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We describe a method for generating molecular hydrogen directly from the charge separation effected via rapid flow of liquid water through a metal orifice, wherein the input energy is the hydrostatic pressure times the volume flow rate. Both electrokinetic currents and hydrogen production rates are shown to follow simple equations derived from the overlap of the fluid velocity gradient and the anisotropic charge distribution resulting from selective adsorption of hydroxide ions to the nozzle surface. Pressure-driven fluid flow shears away the charge balancing hydronium ions from the diffuse double layer and carries them out of the aperture. Downstream neutralization of ... continued below

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Duffin, Andrew M. & Saykally, Richard J. May 31, 2007.

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Description

We describe a method for generating molecular hydrogen directly from the charge separation effected via rapid flow of liquid water through a metal orifice, wherein the input energy is the hydrostatic pressure times the volume flow rate. Both electrokinetic currents and hydrogen production rates are shown to follow simple equations derived from the overlap of the fluid velocity gradient and the anisotropic charge distribution resulting from selective adsorption of hydroxide ions to the nozzle surface. Pressure-driven fluid flow shears away the charge balancing hydronium ions from the diffuse double layer and carries them out of the aperture. Downstream neutralization of the excess protons at a grounded target electrode produces gaseous hydrogen molecules. The hydrogen production efficiency is currently very low (ca. 10-6) for a single cylindrical jet, but can be improved with design changes.

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  • Journal Name: Journal of Physical Chemistry C; Journal Volume: 111; Journal Issue: 32; Related Information: Journal Publication Date: 2007

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  • Report No.: LBNL--63475
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1021/jp072994m | External Link
  • Office of Scientific & Technical Information Report Number: 925596
  • Archival Resource Key: ark:/67531/metadc897500

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • May 31, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Oct. 31, 2016, 3:50 p.m.

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Duffin, Andrew M. & Saykally, Richard J. Electrokinetic Hydrogen Generation from Liquid WaterMicrojets, article, May 31, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc897500/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.