Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 103: Focus Session: Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation IV
O 103.8: Vortrag
Freitag, 22. März 2024, 12:30–12:45, HE 101
Visualizing hydrated protons and their interconversion in monolayer water on metal surfaces — Ye Tian1, •Jiani Hong1, Duanyun Cao1, Sifan You1, Jing Guo2, Ji Chen1, En-Ge Wang1, and Ying Jiang1 — 1International Center for Quantum Materials, Peking University, 100871 China — 2College of Chemistry, Beijing Normal University, 100875 China
Hydrated protons are ubiquitous in solutions and involved in a variety of physical, chemical, biological, and energy-related processes. However, imaging and identifying the configuration of Zundel and Eigen cations and hydrated protons within the H bonding network of water remain a great challenge because of the high similarity between the hydronium (H3O+) and the water molecule (H2O). Recently, we performed the coadsorption of deuterium (D) atoms and D2O molecules on different metal substrates (Au, Cu, Pt, Ru), where the ionized D+ and D2O molecules can self-assemble into a two-dimensional (2D) hydronium-water overlayer. We have substantially improved the resolution and sensitivity of the qPlus-based atomic force microscopy such that the configuration of Zundel and Eigen cations solvated in the 2D water network could be directly visualized with an atomic-level resolution. Furthermore, we conducted the tip manipulation experiments to explore the dynamics of hydronium ions at the interface and found a new proton transfer pathway, accompanied with a simultaneous proton transfer from the water layer to the substrate, which is beyond the previously known elementary steps of hydrogen evolution reaction (HER).
Keywords: atomic force microscopy; hydrated protons; hydrogen bonding network; proton transfer; hydrogen evolution reaction