TY  - JOUR
U1  - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1  - Grimmig, Roman
A1  - Gillemot, Philipp
A1  - Stucki, Samuel
A1  - Günther, Klaus
A1  - Baltruschat, Helmut
A1  - Witzleben, Steffen
T1  - Operating an ozone-evolving PEM electrolyser in tap water: A case study of water and ion transport
JF  - Separation and Purification Technology
N2  - While PEM water electrolysis could be a favourable technique for in situ sanitization with ozone, its application is mainly limited to the use of ultrapure water to achieve a sufficient long-time stability. As additional charge carriers influence the occurring transport phenomena, we investigated the impact of different feed water qualities on the performance of a PEM tap water electrolyser for ozone evolution. The permeation of water and the four most abundant cations (Na+, K+, Ca2+, Mg2+) is characterised during stand-by and powered operation at different charge densities to quantify underlying transport mechanisms. Water transport is shown to linearly increase with the applied current (95 ± 2 mmol A−1 h−1) and occurs decoupled from ion permeation. A limitation of ion permeation is given by the transfer of ions in water to the anode/PEM interface. The unstabilized operation of a PEM electrolyser in tap water leads to a pH gradient which promotes the formation of magnesium and calcium carbonates and hydroxides on the cathode surface. The introduction of a novel auxiliary cathode in the anolytic compartment has shown to suppress ion permeation by close to 20%.
KW  - Nafion™
KW  - Permeation
KW  - Mass transport
KW  - PEM electrolysis
KW  - Tap water
KW  - ozone
UN  - https://nbn-resolving.org/urn:nbn:de:hbz:1044-opus-61958
SN  - 1383-5866
SS  - 1383-5866
U6  - https://doi.org/10.1016/j.seppur.2022.121063
DO  - https://doi.org/10.1016/j.seppur.2022.121063
VL  - 292
SP  - 11
S1  - 11
PB  - Elsevier
ER  -