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Safety considerations during production and consumption of hydrogen using proton exchange membrane electrolysis
Hydrogen (H2) cross-over through a membrane electrolyte is a critical safety issue in proton exchange membrane (PEM) electrolysis. Permeated H2 tends to be consumed by oxidation or recombination at the anode. In this study, the contribution of oxidation/recombination to the reduction of the H2 content in the anode compartment was quantitatively evaluated by measuring the H2 content during the electrolysis operation of a unitized reversible fuel cell stack in which the anode catalyst layer (CL) contained platinum (Pt). The results of fitting calculation indicated that over 70% of permeated H2 flux through the membrane was consumed at the anode by oxidation or recombination when the cathode pressure was under 10 bars. Therefore, promoting H2 consumption due to the addition of Pt in either the CL or current collector is critical for safe PEM electrolysis. Furthermore, optimization of the electrode structure is also important not only to increase the Faraday (current) efficiency but also to reduce the H2 content in the anode.
At the request of the Editors-in-Chief and AIP Publishing this article is being retracted. The article had a high degree of overlap with an article published in the International Journal of Hydrogen Energy. The article is retracted from the scientific record effective 30 June 2017.
Safety considerations during production and consumption of hydrogen using proton exchange membrane electrolysis
Hydrogen (H2) cross-over through a membrane electrolyte is a critical safety issue in proton exchange membrane (PEM) electrolysis. Permeated H2 tends to be consumed by oxidation or recombination at the anode. In this study, the contribution of oxidation/recombination to the reduction of the H2 content in the anode compartment was quantitatively evaluated by measuring the H2 content during the electrolysis operation of a unitized reversible fuel cell stack in which the anode catalyst layer (CL) contained platinum (Pt). The results of fitting calculation indicated that over 70% of permeated H2 flux through the membrane was consumed at the anode by oxidation or recombination when the cathode pressure was under 10 bars. Therefore, promoting H2 consumption due to the addition of Pt in either the CL or current collector is critical for safe PEM electrolysis. Furthermore, optimization of the electrode structure is also important not only to increase the Faraday (current) efficiency but also to reduce the H2 content in the anode.
At the request of the Editors-in-Chief and AIP Publishing this article is being retracted. The article had a high degree of overlap with an article published in the International Journal of Hydrogen Energy. The article is retracted from the scientific record effective 30 June 2017.
Safety considerations during production and consumption of hydrogen using proton exchange membrane electrolysis
Abdalla, S. (author) / Al-Marzouki, Fahd (author) / Obaid, A. (author)
2017-01-01
11 pages
Article (Journal)
Electronic Resource
English
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