Dresden 2026 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 12: Heterostructures, Interfaces and Surfaces: Photonics
HL 12.5: Talk
Monday, March 9, 2026, 17:45–18:00, POT/0051
Lab-Based NAP-XPS for Probing Photoelectrochemical Interfaces: The Case of CuBi2O4 — •Katarina S. Flashar1,2, Miriam Fehrenbach1,2, Gaurav Anand3, Dominic Rapf1,2, Barbara A. J. Lechner3, Ian D. Sharp1,2, and Verena Streibel1,2 — 1Walter Schottky Institute, Technical University of Munich, Garching, Germany — 2Physics Department, TUM School of Natural Sciences, Technical University of Munich, Garching, Germany — 3Chemistry Department, TUM School of Natural Sciences, Technical University of Munich, Garching, Germany
Understanding complex (photo)electrochemical conversion processes at functional interfaces requires in situ and operando characterization. A tool enabling such investigations is near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS). In this contribution, we discuss the implementation of an open liquid cell for (photo)electrochemical measurements at our recently installed, lab-based NAP-XPS system (SPECS). As a photoelectrochemical case study, we examine sputter-deposited copper bismuthate (CuBi2O4) thin film photocathodes in contact with water-based electrolytes. We thereby extend previous NAP-XPS studies on light- and gas-dependent changes in surface chemistry of CuBi2O4 [1] to the solid|liquid interface under illumination. These investigations demonstrate the capability of our lab-based NAP-XPS to probe functional interfaces of energy materials under working conditions, offering an accessible and flexible alternative to synchrotron-based measurements. [1] F. E. Oropeza et al., ACS Appl. Energy Mater. 2019, 2, 6866 - 6874.
Keywords: Near-ambient pressure XPS; X-ray spectroscopy; in situ and operando; ptohoelectrochemical interfaces; CuBi2O4