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. 2018 Apr 7;10(3):44. doi: 10.1007/s40820-018-0197-1

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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. 1 — Schematic illustration of the formation process of the Fe₂O₃ nanotubes@Co₃O₄ composite. (I) Self-assembly of MIL-88B nanorods, Co²⁺ ions, and 2-methylimidazole (2-MIM) to a MIL-88B@ZIF-67 composite. (II) Transformation to Fe₂O₃ nanotubes@Co₃O₄ composite through thermal treatment in air