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. 2021 May 15;13:126. doi: 10.1007/s40820-021-00650-2

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© The Author(s) 2021

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — a ORR polarization curves and b corresponding Tafel slopes of the as-prepared catalysts and Pt/C in 0.1 M KOH. c RDE polarization profiles of Co/CoFe@NC at various rotation speeds and the inset of c shows the respective K-L plots for different voltages. d Chronoamperometric response of the Co/CoFe@NC and Pt/C at a constant potential of 0.6 V; the inset of d shows LSV curves of Co/CoFe@NC before and after chronoamperometric measurements. e Overall polarization curves of all samples over entire ORR and OER region. f Comparison of the bifunctional ORR (E_1/2) and OER (E_j=10) activities in this work with representative electrocatalysts reported recently (the dotted lines denote the ∆E at constant values)