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. 2018 May 2;376(3):20. doi: 10.1007/s41061-018-0198-z

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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. 8 — Formation mechanism of porous carbon–CeO₂ composite. a Blend of lignin and cerium nitrate. b Partially decomposed porous lignin. c Porous carbon CeO₂ composite [20]