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. 2015 Oct 15;8(2):143–150. doi: 10.1007/s40820-015-0069-x

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© The Author(s) 2015

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. 4 — a CV curves of the Co₃O₄@ppy hybrid electrode and Co₃O₄ electrode at a scan rate of 50 mV s⁻¹. b CV curves of the Co₃O₄@ppy hybrid electrode and Co₃O₄ electrode at various scan rates. c CD curves of the Co₃O₄@ppy hybrid electrode and Co₃O₄ electrode with a current density of 2 mA cm⁻². d Areal capacitances of the Co₃O₄@ppy hybrid electrode and Co₃O₄ electrode at various current densities