{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,12]],"date-time":"2025-12-12T13:42:55Z","timestamp":1765546975032,"version":"build-2065373602"},"reference-count":47,"publisher":"MDPI AG","issue":"21","license":[{"start":{"date-parts":[[2022,10,26]],"date-time":"2022-10-26T00:00:00Z","timestamp":1666742400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"national funds","award":["LA\/P\/0045\/2020","UIDB\/00532\/2020","UIDP\/00532\/2020","NORTE-01-0145-FEDER-000077","POCI-01-0145-FEDER-016422"],"award-info":[{"award-number":["LA\/P\/0045\/2020","UIDB\/00532\/2020","UIDP\/00532\/2020","NORTE-01-0145-FEDER-000077","POCI-01-0145-FEDER-016422"]}]},{"name":"Norte Portugal Regional Operational Programme (NORTE 2020)","award":["LA\/P\/0045\/2020","UIDB\/00532\/2020","UIDP\/00532\/2020","NORTE-01-0145-FEDER-000077","POCI-01-0145-FEDER-016422"],"award-info":[{"award-number":["LA\/P\/0045\/2020","UIDB\/00532\/2020","UIDP\/00532\/2020","NORTE-01-0145-FEDER-000077","POCI-01-0145-FEDER-016422"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Energies"],"abstract":"<jats:p>Proton exchange membrane (PEM) technology may regulate the electrical grid connected to intermittent power sources. The growing pace of R&amp;D in alternative components is widening manufacturing methods and testing procedures across the literature. This turns the comparison between performances into a more laborious task, especially for those starting research in this area, increasing the importance of testing components accessible to all. In this study, an electrochemical characterization is performed on a commercial single-cell PEM water electrolyzer with commercial catalyst-coated membranes (CCMs) and one prepared in-house. Two membrane thicknesses and the effect of different catalysts are assessed. The thicker membrane, Nafion 117, operates with 5% greater ohmic overvoltage than the thinner Nafion 115, resulting in up to 1.5% higher voltage for the former membrane. Equivalent Ir black CCMs provided by different suppliers and one prepared in-house perform similarly. Regarding the influence of the anode catalyst, Ir black, IrRuOx and IrRuOx\/Pt have similar performance, whereas IrOx has worse performance. Compared with Ir black, the mix of IrRuOx\/Pt operated with 1.5% lower voltage at 2.6 A cm\u22122, whereas IrRuOx performed with 2% lower voltage at 0.3 A cm\u22122. A temporary increase in performance is observed when the anode is purged with hydrogen gas.<\/jats:p>","DOI":"10.3390\/en15217937","type":"journal-article","created":{"date-parts":[[2022,10,26]],"date-time":"2022-10-26T05:11:33Z","timestamp":1666761093000},"page":"7937","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Experimental Study on the Catalyst-Coated Membrane of a Proton Exchange Membrane Electrolyzer"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8842-7193","authenticated-orcid":false,"given":"Amadeu Gomes","family":"Rocha","sequence":"first","affiliation":[{"name":"CEFT\u2014Transport Phenomena Research Center, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal"},{"name":"ALiCE\u2014Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal"}]},{"given":"Rui","family":"Ferreira","sequence":"additional","affiliation":[{"name":"CEFT\u2014Transport Phenomena Research Center, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal"},{"name":"ALiCE\u2014Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0098-5981","authenticated-orcid":false,"given":"Daniela","family":"Falc\u00e3o","sequence":"additional","affiliation":[{"name":"CEFT\u2014Transport Phenomena Research Center, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal"},{"name":"ALiCE\u2014Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2937-5186","authenticated-orcid":false,"given":"Alexandra M. F. R.","family":"Pinto","sequence":"additional","affiliation":[{"name":"CEFT\u2014Transport Phenomena Research Center, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal"},{"name":"ALiCE\u2014Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2022,10,26]]},"reference":[{"key":"ref_1","unstructured":"IEA (2022, September 20). Net Renewable Capacity Additions by Technology, 2017\u20132023. Available online: https:\/\/www.iea.org\/data-and-statistics\/charts\/net-renewable-capacity-additions-by-technology-2017-2023."},{"key":"ref_2","unstructured":"(2019). World Energy: Issues Monitor 2019. World Energy: Issues Monitor, World Energy Council."},{"key":"ref_3","unstructured":"IRENA (2018). 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