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. 2019 Mar 27;10:1392. doi: 10.1038/s41467-019-09394-5

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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. 2 — Electrocatalytic OER performance. a Polarization curves of EG, NiN_x−PC/EG, Ni-S−PC/EG, N-S−PC/EG, S|NiN_x−PC/EG, and Ir/C for OER. b The corresponding Tafel plots. c Multi-current electrochemical process of S|NiN_x−PC/EG. d Polarization curves of S|NiN_x−PC/EG before and after 2000 cycles. Inset: Chronopotentiometry curves of S|NiN_x−PC/EG under different current densities of 10 and 100 mA cm⁻². All experiments were carried out in 1.0 M KOH