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. 2020 May 4;11:2191. doi: 10.1038/s41467-020-15712-z

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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. 6 — a Voltage versus cycle number on the discharge terminal of the Li–O₂ cells with commercial Pt/C and N-HP-Co SACs. FESEM images of the discharged cathode with the 0.6% commercial Pt/C catalyst (b) and the N-HP-Co SAC catalyst (c) at a current density of 200 mA g⁻¹ after the 5th cycle and the cathode with the 0.6% commercial Pt/C catalyst (d) and the N-HP-Co SAC catalyst (e) after the 20th cycle. One micrometer in b, d; 500 nm in c, e; f, g XPS spectra of the discharged cathodes with 0.6% commercial Pt/C and N-HP-Co SACs: Li 1s (f) and O 1s (g) after the 5th and 20th cycles.