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. 2019 Nov 15;10:5208. doi: 10.1038/s41467-019-13061-0

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© The Author(s) 2019

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 — Mechanistic inights on the WO mechanism. a Rate law plots of the water oxidation current density versus the concentration of MOOH(++) states for FeOOH (orange), Ni(Fe)OOH and FeOOHNiOOH (green). b–d Simple schematic representations of the water oxidation process based on the experimental observations herein for (b) FeOOH, (c) Ni(Fe)OOH and (d) FeOOHNiOOH. Further details of shorter-lived intermediates are beyond the focus of this study. Colour code: FeOOH(0) corresponding to reduced defect states in FeOOH (yellow spheres); FeOOH(+) (orange spheres); FeOOH(++) (red spheres); NiOOH(0) corresponding to Ni(OH)₂ (purple spheres); NiOOH(+) corresponding to NiOOH (green spheres); NiOOH(++) (blue spheres)