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. 2019 Jul 18;10:3169. doi: 10.1038/s41467-019-10996-2

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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. 7 — a A proposed sequence of steps in the photomethanation of CO₂, as catalyzed by a metal porphyrin in solution. b Models of the catalysts and photosensitizers (some hydrogen atoms and counterions have been omitted for clarity). Adapted with permission from Nature Publishing Group: Nature 548, 74–77, Visible-light-driven methane formation from CO₂ with a molecular iron catalyst. Rao, H., Schmidt, L. C., Bonin, J. & Robert, M. (2017)