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. 2017 Aug 2;7:7162. doi: 10.1038/s41598-017-07583-0

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© The Author(s) 2017

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) Digital images of the SGA fabrication process. (b) A schematic representation of the different stages during the formation of the hierarchical porous structure; (c) SEM images of the nested porous structure (inset scale bar is 10 μm). (d) Magnified image of hierarchical structure assembled from rGO/sponge from the Ice-templating method. (e) The transmission electron microscopy (TEM) image of SGA.