Electrokinetic Hydrogen Generation from Liquid Water Microjets

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• 作者：Andrew M. Duffin ; Richard J. Saykally
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：August 16, 2007
• 年：2007
• 卷：111
• 期：32
• 页码：12031 - 12037
• 全文大小：270K
• 年卷期：v.111,no.32(August 16, 2007)
• ISSN：1932-7455

文摘

We describe a method for generating molecular hydrogen directly from the charge separation effected viarapid flow of liquid water through a metal orifice, wherein the input energy is the hydrostatic pressure timesthe volume flow rate. Both electrokinetic currents and hydrogen production rates are shown to follow simpleequations derived from the overlap of the fluid velocity gradient and the anisotropic charge distribution resultingfrom selective adsorption of hydroxide ions to the nozzle surface. Pressure-driven fluid flow shears awaycharge balancing hydronium ions from the diffuse double layer and carries them out of the aperture. Downstreamneutralization 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 beimproved with design changes.