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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. 7 — Cyclic voltammetry analysis of microporous ITO anodes at a scan rate of 4 mV s⁻¹ with BG11 medium as electrolyte. a Response of the bio-anode (Synechocystis) under exposure to different constant light levels. Light intensity 1 corresponds to a photon flux of 820 µmol m⁻² s⁻¹, and the time indicates for how long the light level was applied by the end of the measurement. b Scans of abiotic anodes in the dark. The oxygen content of the electrolyte was varied by purging the electrolyte with nitrogen gas or compressed air