Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 49: Soft Matter Physics: Emerging Topics, New Instruments and Methods
CPP 49.9: Vortrag
Mittwoch, 14. März 2018, 17:15–17:30, C 230
EMIL goes operando: In-situ characterization of real-world electrocatalysts by soft x-ray spectroscopy — •Raul Garcia-Diez1, Regan G. Wilks1,2, and Marcus Bär1,2 — 1Renewable Energy, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (HZB), Berlin (Germany) — 2Energy Materials In-Situ Laboratory Berlin (EMIL), HZB, Berlin (Germany)
The in-situ study of catalyst materials during the electrolysis of water is of vital importance to understand the limiting mechanisms occurring in the catalytic reaction. The combination of soft x-ray absorption (XAS) and emission (XES) spectroscopies is an established method that can probe the chemical and electronic structure of the electrocatalyst and give insights into its local density of states and, therefore, its catalytic behavior.
For this purpose, in the Energy Materials In-Situ Laboratory Berlin (EMIL) at the BESSY II synchrotron facility we are developing an infrastructure that allows XAS, XES, and RIXS (resonant inelastic x-ray scattering) operando studies based on a 3-electrode electrochemistry flow-cell located at the HZB’s branch of the EMIL beamline. The modular design of the measurement chamber ensures an easy connection to the newly developed high-transmission soft x-ray emission spectrometer, which covers the photon range between the Li and the Si K-edge with an energy resolving power > 1500.
We present the current status of the instrumentation in EMIL and the first spectroscopic results on our path towards the in-situ characterization of real-world electrocatalysts under operating conditions.