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. 2022 Aug 11;14:162. doi: 10.1007/s40820-022-00890-w

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© The Author(s) 2022

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. 4 — a LSV curves of catalysts for ORR with a scan rate of 5 mV s⁻¹ under 0.1 M KOH, at 1600 rpm. b Tafel plots of catalysts for ORR. c Electron transfer number and HO₂⁻ yield of CoNP@FeNC-0.05 derived from the RRDE tests under 0.1 M KOH. d LSV curves of catalysts for OER with a scan rate of 5 mV s.⁻¹ under 1 M KOH, at 1600 rpm. e Tafel plots of catalysts for OER. f Plots of current density versus scan rate under 0.1 M KOH. The slopes of the curves correspond to the C_dl values of catalysts