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

  • 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%.

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Document Type:Article
Author:Roman Grimmig, Philipp Gillemot, Samuel Stucki, Klaus Günther, Helmut Baltruschat, Steffen Witzleben
Parent Title (English):Separation and Purification Technology
Article Number:121063
Number of pages:11
Publishing Institution:Hochschule Bonn-Rhein-Sieg
Date of first publication:2022/04/11
Funding:This work was supported and financed by the Federal Ministry of Education and Research programs “KMU-Innovativ” project “OzonArray” (grant number: 02WQ1373B) and “FHprofUnt” project “ReDeX” (grant number: 13FH107PX8).
Keyword:Mass transport; Nafion™; PEM electrolysis; Permeation; Tap water; ozone
Departments, institutes and facilities:Fachbereich Angewandte Naturwissenschaften
Projects:KMU-innovativ Verbundprojekt Ozon-Array: Entwicklung eines Elektrolyseurs mit strukturierten Membran-Elektroden-Arrays für die in situ Produktion von Ozonlösungen in Wasser beliebiger Qualität, Teilprojekt 2 (DE/BMBF/02WQ1373B)
FHprofUnt 2018: Entwicklung einer reduktiven Behandlungsmethode zur Entfernung von Desinfektionsnebenprodukten und Xenobiotika aus Trinkwasser (ReDeX) (DE/BMBF/13FH107PX8)
Dewey Decimal Classification (DDC):6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften / 628 Sanitär- und Kommunaltechnik; Umwelttechnik
6 Technik, Medizin, angewandte Wissenschaften / 66 Chemische Verfahrenstechnik / 660 Chemische Verfahrenstechnik
Open access funding:Hochschule Bonn-Rhein-Sieg / Graduierteninstitut
Entry in this database:2022/04/22
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International