Print Email Facebook Twitter Electro-osmotic flow and the limiting current in alkaline water electrolysis Title Electro-osmotic flow and the limiting current in alkaline water electrolysis Author Haverkort, J.W. (TU Delft Energy Technology) Rajaei, H. (TU Delft Energy Technology) Date 2020 Abstract 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 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 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. Subject Alkaline water electrolysisHydrogen purityLimiting current densityMicroporous separator To reference this document use: http://resolver.tudelft.nl/uuid:0ce4eae3-1c4c-4c19-9ccc-11ea88a71865 DOI https://doi.org/10.1016/j.powera.2020.100034 Source Journal of Power Sources Advances, 6 Part of collection Institutional Repository Document type journal article Rights © 2020 J.W. Haverkort, H. Rajaei Files PDF 1_s2.0_S2666248520300342_main.pdf 578.84 KB Close viewer /islandora/object/uuid:0ce4eae3-1c4c-4c19-9ccc-11ea88a71865/datastream/OBJ/view