Solid-liquid interfaces studied with synchrotron-based ambient pressure X-ray photoelectron spectroscopy
David Starr a, Marco Favaro a, Pip Clark a, Rossella Yivlialin a, Maryline Ralaiarisoa a, Martin Johansson b, Sven Maehl b, Michael Sear a, Roel van de Krol a
a Institute for Solar Fuels, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
b SPECS Surface Nano Analysis GmbH, Voltastraße, 5, Berlin, Germany
Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe Fall Meeting 2021 (NFM21)
#SolFuel21. Solar Fuel: In-situ and operando characterization of electrified interfaces
Online, Spain, 2021 October 18th - 22nd
Organizers: Bastian Mei, Jan Philipp Hofmann and María Escudero-Escribano
Invited Speaker, David Starr, presentation 148
DOI: https://doi.org/10.29363/nanoge.nfm.2021.148
Publication date: 23rd September 2021

Ambient pressure X-ray photoelectron spectroscopy is a valuable tool for investigating surfaces and interfaces in elevated pressure conditions. We have recently constructed and commissioned a new end-station dedicated to Spectroscopic Analysis with Tender X-rays (SpAnTeX).  The SpAnTeX end-station focuses on X-ray photoelectron spectroscopy measurements of solid-liquid interfaces. It is able to operate at pressures up to 30 mbar and photoelectron kinetic energies up to 10 keV. At the heart of the SpAnTeX end-station is a SPECS PHOIBOS 150 HV NAP electron spectrometer. This new spectrometer contains two additional features that allow for measurements with lateral resolution better than 30 μm and time resolved measurements with 100 ns or less time resolution. The SpAnTeX end-station is based on a modular concept which allows for the rapid exchange of sample environment modules. To date, we have constructed two modules. One module, the dip-and-pull module, is used for investigating solid-liquid interfaces under applied bias and illumination. The second module incorporates a droplet train which facilitates investigation of liquid phase processes with time resolution ranging from the μs to ms regimes. After a technical introduction to the SpAnTeX end-station and the experimental modules, results obtained using SpAnTeX will be presented. We will present results for Electrochemically Mediated Amine Regeneration (EMAR) for CO2 capture and sequestration processes, and light induced changes at the bismuth vanadate- and silicon-aqueous electrolyte interfaces.

This project was supported by the Helmholtz Association through the Helmholtz Energy Materials Foundry (HEMF, GZ 714-48172-21/1).

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