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. 2022 Apr 21;13:2191. doi: 10.1038/s41467-022-29875-4

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© The Author(s) 2022

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. 4 — a Schematic illustration and b Gibbs free energy diagrams of the LOM pathway on NiFe and MoNiFe (oxy)hydroxide. c Linear sweep voltammetry (LSV) curves for NiFe and MoNiFe (oxy)hydroxide measured in KOH with pH = 11.78, 12.75, 12.91, and 13.65. d OER current density at 1.52 V versus RHE plotted in log scale as a function of pH, from which the proton reaction orders (ρ^RHE = ∂logi/∂pH) were calculated. e LSV curves for NiFe and MoNiFe (oxy)hydroxide measured in 1 M NaOH and 1 M NaOD solution. The LSV curves are without iR compensation. f The kinetic isotope effect of MoNiFe and NiFe (oxy)hydroxide. j^H and j^D are referred to the current density measured in NaOH and NaOD solution, respectively.