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. 2019 Sep 27;10:4421. doi: 10.1038/s41467-019-12385-1

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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. 1 — EPR patterns of the N-doped TiO₂ photocatalysts. a N-doped TiO₂ N-P25-550 (freshly prepared) at different times. After being treated in NH₃ at 550 °C for 8 h, the EPR of the freshly made sample was measured immediately. Then more EPR spectra were also collected after the sample was exposed to air for 0.5, 1, 3 and 24 h. b Deactivated N-P25-550 after recalcination in N₂ at different temperatures; N-P25-550 quenched from c liquid water and d water vapour at different temperatures