Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 45: Poster: Solid-Liquid Interfaces - Structure, Spectroscopy, Reactions and Electrochemistry
O 45.19: Poster
Tuesday, March 13, 2018, 18:15–20:30, Poster A
A Novel Electrochemistry Flow Cell for Operando Soft X-Ray Spectroscopy on Catalysts: Demonstrated on a MnOx Film for the Water Oxidation Half Reaction — •Marc F. Tesch1, Shannon A. Bonke1, Maryam N. Shaker1, Travis E. Jones2, Jie Xiao1, Rosalie K. Hocking3, and Alexandr N. Simonov4 — 1Helmholtz Zentrum Berlin, Berlin, Germany — 2Fritz-Haber-Institut, Berlin, Germany — 3Swinburne University of Technology, Victoria, Australia — 4Monash University, Victoria, Australia
We present a novel flow cell design for soft X-ray spectroscopy on catalysts optimized for in situ electrodeposition and electrochemistry. Soft X-ray based photon-in - photon-out techniques can probe the electronic structure of a catalyst while it is in contact with an electrolyte and a potential is applied, i.e. operando. Soft X-ray absorption spectroscopy (XAS) allows probing the unoccupied valence states, thereby providing information such as the oxidation state of the catalyst. Resonant inelastic soft X-ray scattering (RIXS) can access valence electronic processes such as charge transfer and dd-transitions. The combination of XAS and RIXS provides a comprehensive picture of electronic changes occurring in a catalyst when tuning the external conditions towards its active state, e.g. by increasing an applied potential across the overpotential. The applicability of the aforementioned experimental techniques is demonstrated on a MnOx catalyst for the water oxidation half reaction measured at different applied potentials. The experimental results are discussed with focus on the potential induced changes in its electronic structure and are compared to theory.