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. 2019 Feb 7;10:631. doi: 10.1038/s41467-019-08419-3

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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. 4 — Electrochemical measurements. a Linear sweep voltammetric (LSV) curves of Ru-NC-T and commercial 20 wt% Pt/C in 0.1 M KOH. b Tafel plots of Ru-NC-T and 20% Pt/C. The legends are the same as those in a. c LSV curves of Ru-NC-700 and 20% Pt/C in 1 M KOH. d Nyquist plots of Ru-NC-T and 20% Pt/C in 0.1 M KOH at −10 mV vs. RHE. The legends are the same as those in a. Symbols are experimental data and solid curves are fits by Randles’ equivalent circuit. e Stability test of Ru-NC-700 in 0.1 M KOH, before and after 10,000 cycles within the potential window of −0.05 V to +0.05 V vs RHE. f Catalyst poisoning experiment for Ru-NC-700 in 0.1 M KOH with the addition of 10 mM of ethylenediaminetetraacetic acid (EDTA, red curve) or 10 mM of potassium thiocyanate (KSCN, green curve)