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FM: Fachverband Funktionsmaterialien
FM 6: Focus Session: Materials Discovery I – Material informatics
FM 6.10: Vortrag
Dienstag, 10. März 2026, 12:15–12:30, BEY/0138
Compositional and Structural Impact on the Hydrogen Evolution Reaction Activity across Noble-Metal-Based Compositionally Complex Solid Solutions Thin Film Libraries — •Natalia Pukhareva1, Moonjoo Kim2, Felix Thelen1, Geovane Arruda de Oliveria2, Rico Zehl1, Wolfgang Schuhmann2, and Alfred Ludwig1 — 1Materials Discovery & Interfaces, Ruhr University Bochum — 2Analytical Chemistry - Center for Electrochemical Sciences (CES), Ruhr University Bochum
Compositionally complex solid solutions (CCSS) stabilize multielement alloys and allow tuning of surface chemistry for the hydrogen evolution reaction (HER). Three quinary libraries (Ir-Pd-Pt-Rh-Ru, Ag-Au-Pd-Pt-Ru, Ag-Au-Cu-Pd-Pt) were prepared by sputtering and mapped across 342 positions each. Energy-dispersive X-ray spectroscopy (EDX) confirmed smooth composition gradients, and X-ray diffraction (XRD) showed fcc solid solutions with minor hcp fractions in Rh-Ru-rich regions and no detectable phase effect on HER. X-ray photoelectron spectroscopy (XPS) with Gaussian-process regression revealed composition-dependent surface segregation and distinct surface compositions. HER activity, measured by scanning electrochemical cell microscopy (SECCM), followed Ir-Pd-Pt-Rh-Ru > Ag-Au-Pd-Pt-Ru > Ag-Au-Cu-Pd-Pt. In the Ag-containing libraries Pd-rich compositions outperformed Pt-rich ones, and in Ag-Au-Cu-Pd-Pt Ag-rich regions exceeded Cu-rich regions despite Cu's higher intrinsic activity, consistent with segregation limiting surface Pt and Pd and indicating that HER in these CCSS is dominated by multielement interactions.
Keywords: combinatorial synthesis; thin-film materials libraries; scanning electrochemical cell microscopy; hydrogen evolution reaction; high-throughput screening