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. 2023 Oct 18;14:6590. doi: 10.1038/s41467-023-42224-3

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© The Author(s) 2023

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a, b Oxidation current of Fe(CN)₆⁴⁻ (a) on REMs at different fluxes and the corresponding K_obs (b) of REM_7 μm and REM_105 μm. c Schematic diagram of the oxidation of Fe(CN)₆⁴⁻ on REMs at different fluxes. The convection limit shown in a represents the situation where all the influent Fe(CN)₆⁴⁻ ions are oxidized. Highlighted areas in b correspond to the respective contributions of specific surface area and pore diffusion. Experiments were conducted at 1.91 V_RHE in an electrolyte containing 0.1 mM Fe(CN)₆⁴⁻, 0.2 mM Fe(CN)₆³⁻, and 0.33 M NaClO₄.