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. 2018 Jun 15;13:181. doi: 10.1186/s11671-018-2582-6

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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. 6 — Galvanostatic charge/discharge curves (a) and CV pattern (b) of the as-prepared film in 0.5 M Na₂SO₄ (pH 6.0) (mass ratio of 50:1 and scan rate of 50 mV/s)