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. 2020 Jul 16;11:3561. doi: 10.1038/s41467-020-17370-7

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 7 — AMFC micro X-ray computed tomography images: (a) cross-section of the MEA showing the position of anode GDE, AEM, and cathode GDE of the imaged area; scale bar = 500 μm, (b), (c) longitudinal sections of anode and cathode GDEs at OCV under 100% RHs, (d), (e) longitudinal sections of anode and cathode GDEs at 0.1 V under 100% RHs. The anode and cathode used in this measurement contained 20% wt PTFE in the GDLs and 8% wt PTFE in the CLs. The anode and cathode loading were 0.70 mg_PtRu cm⁻² and 0.60 mg_Pt cm⁻², respectively. H₂/O₂ reacting gases were both fed to the cell at 200 sccm.