A. Simanenko1, P. K. Samal2, R. Hübsch1, J. Škvára2, J. Yang1, M. Kastenmeier1, F. Winkler1, T. Skála2, N. Tsud2, S. Mehl3, J. Mysliveček2, O. Brummel1, Y. Lykhach1, J. Libuda1 1 Interface Research and Catalysis, ECRC, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany 2 Department of Surface and Plasma Science, Charles University, Prague, Czech Republic 3 Elettra - Sincrotrone Trieste S.C.p.A., Trieste, Italy e-mail: olaf.brummel@fau.de; yaroslava.lykhach@fau.de; joerg.libuda@fau.de Acknowledgments The authors acknowledge the CERIC-ERIC Consortium for the access to experimental facilities and financial support. The authors acknowledge the financial support from the Deutsche Forschungsgemeinschaft (DFG) (SFB 1452, Project 431791331) and the Bavarian Ministry of Economic Affairs, Regional Development and Energy. Additional support was given by the DFG via Projects 322419553, 431733372, 453560721, and 418603497 and the German Federal Ministry of Education and Research (BMBF, Project Combined Infrared and X-ray Analytics of Energy Materials, CIXenergy 05K19WE1). The authors further acknowledge the financial support of the Czech Science Foundation (GAČR, project 2021727X), and the Ministry of Education, Youth and Sports of the Czech Republic (MŠMT, project QM4ST, reg. no. CZ.02.01.01/00/22_008/0004572; project LM2023072). J.Y. acknowledges the support from the China Scholarship Council. J.Š. acknowledges the support of the Grant Agency of the Charles University (GAUK, project 199423). Original paper A. Simanenko et al., ACS Energy Lett. 9, 4875 (2024); DOI: 10.1021/acsenergylett.4c01987. Fig. 1 Figure 1. A gallery of the Pt–Ru surface alloy structures (a); Cyclic voltammograms (b-d), joint Ru 4s and Pt 4f spectra (e, f), STM images (141 nm × 141 nm) (g, h), and s-polarized EC-IRRA spectra (j, k) obtained from the Pt–Ru alloy model catalyst before (b, e, g, j), during (c), and after (d, f, h, k) dealloying procedure. EC-IRRA reference spectra were recorded at 0.05 VRHE. Figures 1a-k adapted from A. Simanenko et al., ACS Energy Lett. 9, 4875 (2024), CC-BY 4.0. 0.0 0.2 0.4 0.6 0.8 1.0 Potential, VRHE 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 Potential, VRHE 0.0 0.2 0.4 0.6 0.8 Potential, VRHE -0.1 0.0 0.1 0.2 0.3 0.4 2 Current density, mA/cm Cycle1 Cycle2 Cycle3 Cycle4 Cycle5 Before oxidative cleaning Cycle1 Cycle2 Cycle3 Oxidative cleaning Cycle1 Cycle2 Cycle3 Cycle4 Cycle5 After oxidative cleaning b) c) d) Pt coverage Pt Pt Ru 2 PtRu PtRu2 Ru(0001) Ru 4s Pt 4f 78 76 74 72 70 68 Binding energy, eV 0 Pt Ru 4s isopropanol acetone 1711 1435 1420 13591220 1467 1379 1368 1160 1129 1340 1308 u(CO )2 s-pol DR/R = 1% d(HOH) u(-C=O) 2400 2200 2000 1800 1600 1400 1200 -1 Wavenumber, cm k) ATR reference EC-IRRAS Ru 4s Pt 4f 78 76 74 72 70 68 Binding energy, eV 0 Pt Ru 4s nm 2.0 1.6 1.2 0.8 0.4 0.0 g) 5.0 nm 4.0 3.0 2.0 1.0 0.0 h) u(CO )2 s-pol u(-C=O) 2400 2200 2000 1800 1600 1400 1200 -1 Wavenumber, cm isopropanol acetone 1711 1435 1420 13591220 1467 1379 1368 1160 1129 1340 1308 j) DR/R = 1% ATR reference EC-IRRAS SRPES SRPES Intensity, arb. units Intensity, arb. units e) f) 0.9 VRHE 0.05 VRHE a) 0.9 VRHE 0.05 VRHE Surfaces and Interfaces Elettra Highlights 2024–2025 115
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