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. 2021 Sep 1;12:5223. doi: 10.1038/s41467-021-25573-9

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© The Author(s) 2021

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. 5 — a Schematic of the MEA configuration. b The optical image of an MEA device. c Current densities vs. applied potentials of Bi, Sn, and Bi_0.1Sn in AEM-based MEA systems. d HCOO^– FEs and EEs of Bi, Sn, and Bi_0.1Sn at different current densities in AEM-based MEA systems. e Comparison of our data with literature benchmarks (We plot the concentration values obtained in the longest duration tests in each report).