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. 2020 Jun 10;11:2940. doi: 10.1038/s41467-020-16769-6

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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. 4 — a iR-corrected OER polarization curves of the electro-oxidized nanoporous Co₃Mo/Cu (EO Co₃Mo/Cu), Co/Cu (EO Co/Cu), and bare Cu (EO Cu) in 1 M KOH electrolyte, along with commercially available Ir/C supported by nanoporous Cu (Ir/C/Cu). Inset: typical SEM image of electro-oxidized nanoporous Co₃Mo/Cu. Scale bar: 1 μm. b Tafel plots comparing the Tafel slopes of different OER electrocatalysts according to the polarization curves in panel (a). c Comparison of current density of the EO Co₃Mo/Cu electrode at the overpotential 350 mV with those of EO Co/Cu, EO Cu and nanoporous Ir/C/Cu. d Stability measurements of the electro-oxidized nanoporous Co₃Mo/Cu at overpotential of 300, 350, and 400 mV for 30 h.