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. 2018 Apr 3;9:1299. doi: 10.1038/s41467-018-03320-x

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© The Author(s) 2018

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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Fig. 2 — Electrode porosity. a Scheme of microporous electrode fabrication method. b Optical bright field microscopy image of an empty microporous electrode (scale bar: 100 µm). c Optical dark field microscopy image showing an electrode filled with cyanobacteria (after rinsing with water; scale bar: 20 µm). Scanning electron microscopy (SEM) images showing d the cross-section of the electrode (scale bar: 40 µm) and e the nanoporous structure of sintered nanoparticles (scale bar: 400 nm)