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Open AccessArticle

The Effects of Acidic, Alkaline, and Neutral Anolytes on Electrochemical Seawater Deoxygenation

1
Department of Chemistry, Bioscience and Environmental Engineering, University of Stavanger, NO-4036 Stavanger, Norway
2
Deox AS, Professor Olav Hanssens vei 7A, NO-4021 Stavanger, Norway
*
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(11), 2280; https://doi.org/10.3390/app8112280
Received: 30 September 2018 / Revised: 13 November 2018 / Accepted: 15 November 2018 / Published: 18 November 2018
(This article belongs to the Special Issue Electro-membrane Processes for Clean Water and Sustainable Energy)
Electrochemical deoxygenation of seawater has advantages over available chemical and physical methods. For seawater deoxygenation, acidic, neutral, or alkaline anolytes can be used. The effects of acidic, alkaline, and neutral buffered and non-buffered anolytes were studied in two compartment deoxygenation cells. The pH, conductivity, H2O2 production, and current were measured throughout the experiments. The optimum applied potentials for oxygen reduction were between 1.9 V–2.2 V, giving water as product; reducing the applied potential also resulted in the formation of H2O2. Analysis after the experiments using a scanning electron microscope with electron-dispersive X-ray spectroscopy showed that both the silver mesh and the cation exchange membrane remained stable during the experiments. The use of alkaline anolytes resulted in the maximum oxygen removal with minimal side reactions in the cell. View Full-Text
Keywords: cation exchange membrane; electrochemical; seawater; deoxygenation; electrolytes; pH; oxygen cation exchange membrane; electrochemical; seawater; deoxygenation; electrolytes; pH; oxygen
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MDPI and ACS Style

Dotel, U.R.; Sydnes, M.O.; Urkedal, H.; Hemmingsen, T. The Effects of Acidic, Alkaline, and Neutral Anolytes on Electrochemical Seawater Deoxygenation. Appl. Sci. 2018, 8, 2280.

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