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. 2019 Sep 9;10:4081. doi: 10.1038/s41467-019-12009-8

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© The Author(s) 2019

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. 4 — Sunlight-driven CO₂ reduction using Sr₂GaCoO₅ anode for oxygen evolution and anodized silver cathode for CO₂ reduction. a Current density–voltage characteristics of the photovoltaic (red) and electrolysis cell (green). The photovoltaic performance is shown under illumination of standard AM 1.5G solar light and 100 mW·cm⁻² intensity (1 sun) and its maximum power point is marked by a black dot. The calculated intersection is shown as the black cross. b Faradaic efficiency, solar current density and STF_CO efficiency for the total operation of 19 h. The fluctuation of STF_CO was mainly attributed to the change of Faradaic efficiency by as much as 4% due to the sensitive CO selectivity on the potential applied on a-Ag cathode