Electro-osmotic flow and the limiting current in alkaline water electrolysis

Electro-osmotic flow and the limiting current in alkaline water electrolysis

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Under alkaline conditions, hydroxide ions can deplete at the anode of a water electrolyser for hydrogen production, resulting in a limiting current density.We found experimentally that in a micro-porous Belt Gift Box separator, an electro-osmotic flow from anode to cathode lowers this limiting current density.Using the Nernst-Planck equation, a useful expression for the potential drop in the presence of diffusion, migration, and advection MAGNESIUM BIS-GLYCINATE 80 GENTLE is derived.A quasi-stationary, one-dimensional model is used to successfully describe the transient dynamics.

Electro-osmotic flow-driven cross-over of dissolved oxygen is argued to impact the hydrogen purity.