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. 2020 Jan 24;11:490. doi: 10.1038/s41467-019-14274-z

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© The Author(s) 2020

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 — a The polarization curves of 1% PtW₆O₂₄/C and 20% Pt/C in N₂-saturated 0.5 M H₂SO₄. b Tafel slope of 1% PtW₆O₂₄/C and 20% Pt/C. c Mass activity of PtW₆O₂₄/C and 20% Pt/C at 77 mV (left), the specific activity of 1% PtW₆O₂₄/C and 20% Pt/C at 50 mV (right). d The relationship between the current density, the overpotential, and the Pt content. The blue area indicates that the current density of PtW₆O₂₄/C and 20% Pt/C is the same. The yellow area indicates that the current density of PtW₆O₂₄/C is greater than Pt/C, and the gray area indicates that the current density of PtW₆O₂₄/C is lower than Pt/C. e The polarization curves of 1% PtW₆O₂₄/C before and after 1000 and 3000 cycles at scan rate of 5 mV s⁻¹. Inset: Time-dependent current density current of 1% PtW₆O₂₄/C and 20% Pt/C within 24 h (left). The locally enlarged plot of the time-dependent current density current for the first 0.5 h (right). f In situ XANES spectra of the 1% PtW₆O₂₄/C sample at Pt L₃-edge. Feature A is attributed to Pt L₃-edge and feature B is attributed to W L₂-edge.