Operating an ozone-evolving PEM electrolyser in tap water: A case study of water and ion transport

• Ion and water permeation is modeled for PEM electrolysers using tap water. transport depends on hardness ion mobility in Water only occurs powered operation due to migration. Auxiliary cathode anolytic compartment reduces by approx. 18% While electrolysis could be a favourable technique situ sanitization with ozone, its application mainly limited the use of ultrapure achieve sufficient long-time stability. As additional charge carriers influence occurring phenomena, we investigated impact different feed qualities performance electrolyser ozone evolution. The four most abundant cations (Na + , K Ca 2+ Mg ) characterised during stand-by at densities quantify underlying mechanisms. shown linearly increase applied current (95 ± 2 mmol A ?1 h decoupled from permeation. limitation given transfer ions anode/PEM interface. unstabilized leads pH gradient which promotes formation magnesium calcium carbonates hydroxides surface. introduction novel auxiliary has suppress close 20%.