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. 2023 Nov 8;14:7210. doi: 10.1038/s41467-023-42756-8

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© The Author(s) 2023

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 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 LSV curves and d Tafel plots toward ORR in 0.1 M KOH; b LSV curves and e Tafel plots toward OER; and c LSV curves and f Tafel plots toward HER in 1.0 M KOH for all investigated and commercial (Pt/C or RuO₂) catalysts. g Open-circuit potential plots; h specific capacities; and i discharge polarization, charge polarization, and corresponding power density curves for ZABs driven by Co₂-N-HCS-900 or commercial Pt/C + RuO₂. j Discharge curves of ZABs at various discharge current densities, and k LED screen powered by two tandem Co₂-N-HCS-900-based ZABs.