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. 2017 Jun 12;8:15717. doi: 10.1038/ncomms15717

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Copyright © 2017, The Author(s)

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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(a) CV curves of the MDC-OMC at various scan rates. (b) GCD curves of the MDC-OMC at different current densities. (c) Comparison of gravimetric capacitances (the solid symbols) and SSA-normalized capacitances (the hollow symbols) and (d) volumetric capacitances versus different current densities for the MDC-OMC, MDC/OMC, MDC and OMC. (e) Nyquist plots of the MDC-OMC and MDC with the close-up view on the high-frequency regime. (f) Cycling performance of the MDC-OMC. Inset: The corresponding galvanostatic charge/discharge curves at a current density of 4 A g⁻¹ of 1st and 7,000th cycle. The reference electrode is a SCE.