Regensburg 2016 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Poster: Nanoparticles, Nanocrystals and Composites

CPP 13.6: Poster

Montag, 7. März 2016, 18:15–21:00, Poster B2

Strong correlated electronic system in Mn3+ oxide revealed by RIXS — •Daniela Schön, Ronny Golnak, Marc F. Tesch, Jie Xiao, and Emad F. Aziz — Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Deutschland

MnOx has been demonstrated as effective water oxidation catalysts, among which Mn3+ species has been proven as the most efficient ingredient when compared to other Mn oxidation states. The information on electronic structure of MnOx is certainly critical to understand the catalytic mechanism and to further improve the catalytic activity. While most of the electronic structure investigations are conducted on solid samples, few are performed in liquid environment to mimic realistic conditions. We selected solvated Mn3+acac3 in dichloromethane as a prototypical system to carry out in-situ RIXS measurements, an ideal model system probed by a proper technique. Mn3+ ion is coordinated by six O atoms in liquid phase, which perfectly simulates the situation of Mn3+ species during water catalysis. RIXS is able to detect element-specific valence excitations in bulk, an ideal tool to probe local (catalytic site) electronic structure of Mn in liquid. Moreover, the intensity ratio of RIXS loss features to normal emission features can be utilized to determine the extent of the electronic correlation in the target system. Intense RIXS loss features of Mn3+ are observed, implying a highly localized and strong correlated electronic system in Mn3+ d4 configuration.