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. 2019 Dec 16;10:5724. doi: 10.1038/s41467-019-13388-8

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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. 2 — Electrochemical measurements in CO₂-saturated 0.5 M KHCO₃ solution. a Linear sweep voltammetric curves; b Faradaic efficiency of CO and H₂ and CO/H₂ ratio; c stability of partial CO current density (j_CO) measured at −0.8 V vs. RHE for 12 h. d In situ silver K-edge XANES and e EXAFS spectra of 4 nm AgP₂ NCs after 30 min at the specified potential. Pristine AgP₂ NCs, AgO, Ag₂O, and Ag foil are included as references. f Faradaic efficiency of the CO and CO:H₂ ratio as a function of Ag^δ+ in AgP₂ and Ag.