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. 2018 Jul 13;10(4):63. doi: 10.1007/s40820-018-0217-1

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© The Author(s) 2018

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, b GCD, c EIS curves, and d the specific capacitances of the VN/C (I) and VN/C (II) at different current densities (scan rate = 10 mV s⁻¹ in 6.0 M KOH aqueous solution)