Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 67: Solid-Liquid Interfaces III: OER, ORR, CO2RR, etc.
O 67.1: Invited Talk
Wednesday, March 18, 2020, 10:30–11:00, WIL C107
The shiniest gold (111) surface — Weronica Linpe1, Jonas Evertsson1, Giuseppe Abbondanza1, Alfred Larsson1, Gary Harlow1, Johan Zetterberg2, Lisa Rämisch2, Sebastian Pfaff2, and •Edvin Lundgren1 — 1Division of Synchrotron Radiation Research, Lund University, Box 118, S-221 00, Sweden — 2Division of Combustion Physics, Lund University, SE-22100 Lund, Sweden
We have studied in situ the development of the Au(111) surface during electrochemical Cyclic Voltammetry (CV) measurements using 2D Surface Optical Reflectance (SOR) and High Energy Surface X-Ray Diffraction (HESXRD) with high temporal resolution. We demonstrate that the famous Herring Bone (HB) reconstruction of Au(111) appears in HESXRD at voltages close to the hydrogen evolution reaction signature in the CV and is lifted close to the oxide formation signature. The 2D maximum SOR intensity is shown to coincide with the maximum of the HB intensity, demonstrating that the shiniest gold (111) surface is due to the presence of the HB. On the contrary, the crystal truncation rods exhibit a strong decrease in intensity in conjunction with the appearance of the HB reconstruction. The decrease in intensity of the CTRs can be attributed to the mixed fcc and hcp sites at the Au(111) surface in the HB structure.