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. 2017 Nov 14;10(1):15. doi: 10.1007/s40820-017-0170-4

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© The Author(s) 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 9 — a LSV curves of the M-Co₃O₄/NPC, H-Co₃O₄/NPC, and T-Co₃O₄/NPC composites in O₂-saturated 1.0 M KOH solution (scan rate 5 mV s⁻¹), b Tafel plots of the prepared catalysts