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. 2021 Jun 8;22(13):1302–1315. doi: 10.1002/cphc.202100027

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© 2021 The Authors. ChemPhysChem published by Wiley-VCH GmbH

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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XP spectra (Ce 3d region) of Au/CeO₂ catalysts after different pretreatments (left) and after CO oxidation. Peaks in red, pink: Ce³⁺; blue, green, grey: Ce⁴⁺ species. Reprinted with permission from Ref. [38] © 2016, Elsevier Inc.