Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 24: Functional Semiconductors for Renewable Energy Solutions (joint session HL/KFM)

HL 24.10: Talk

Wednesday, September 7, 2022, 17:45–18:00, H36

Electrical transport across catalyst/defect-engineered titania corrosion protection layer interfaces for light-driven CO2 reduction — •Julius Kühne, Oliver Bienek, Tim Rieth, and Ian D. Sharp — Walter Schottky Institute and Physics Department, Technical University of Munich, Am Coulombwall 4, 85748 Garching, Germany

Producing value-added products via light-driven CO2 reduction represents a promising approach to sustainably address increasing CO2 emissions and meet the growing global energy demand. However, such solar fuels systems require passivating layers to chemically protect semiconductor light absorbers from harsh reaction environments. Despite great progress in the development of atomic layer deposited (ALD) protection layers, the factors governing efficient charge injection into the catalytic component are not yet well understood. Here, the charge transport characteristics between various defect-engineered TiO2 protection layers grown with ALD and metal catalyst layers including Ag, Au, Pt, Ni and Ti are analyzed. This work aims to get a deeper understanding of the interface between catalyst and protection layer in terms of contact resistivity, carrier transport, and interface kinetics. Additionally, results of EC and PEC measurements are compared to assess the stability and activity of these systems under CO2 reduction conditions in a two-compartment cell with ion exchange membrane. The selectivity of selected catalyst layers is evaluated by gas chromatography of the reaction products, thereby enabling a quantification of their overall performance characteristics.