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. 2022 Feb 16;12:2604. doi: 10.1038/s41598-022-06608-7

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© The Author(s) 2022

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Comparative free energy diagram for (a) Ag₄/TiO₂ and (b) Au₄/TiO₂. Overpotential is shown in the upper left corner. The rate-determining step (R.D.S) for Ag and Au as active sites is O* while OOH* for Ti atom as an active site. Thus, the blue profile represents Ti as an active site, the red profile represents Au as an active site, and the green profile represents Ag as an active site.