Interface Sensitivity in Electron/Ion Yield X-ray Absorption Spectroscopy: The TiO<sub>2</sub>–H<sub>2</sub>O Interface
M. A. Van Spronsen, Xiao Zhao, Maximilian Jaugstetter, Carlos Escudero, Tomáš Duchoň, Adrian Hunt, Iradwikanari Waluyo, Peidong Yang, Kristina Tschulik, Miquel Salmerón
Abstract
window, acting as the working electrode in a three-electrode flow cell. The spectra are collected based on the electron emission resulting from the decay of the X-ray-induced core-hole-excited atoms, which we show is sensitive to the solid-liquid interface within a few nm. The drain currents measured at the working and counter electrodes are identical but of opposite sign. With this method, we found that the water layer next to anatase is spectroscopically similar to ice. This result highlights the potential of electron-yield XAS to obtain chemical and structural information with a high sensitivity for the species at the electrode-electrolyte interface.