Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MM: Fachverband Metall- und Materialphysik
MM 20: Poster session II
MM 20.20: Poster
Dienstag, 2. April 2019, 18:30–20:00, Poster C
TEM investigations of microstructure and manganese-valence evaluation in LixMn2O4 nanoparticles. — •Florian Schönewald, Max Baumung, Vladimir Roddatis, Marcel Risch, and Cynthia A. Volkert — Institut für Materialphysik, Georg-August Universität, Göttingen
Controlling the oxygen evolution reaction (OER) is an important step in achieving a sustainable renewable energy future. At the moment, the process of generating molecular oxygen from water by chemical means is severely kinetically limited. LixMn2O4 is studied here as a model electrocatalyst to understand the role of valence state and covalency on the electron transfer reaction.
The goal of this study is to control the OER by manipulating the manganese valence via electrochemical lithium de-/intercalation. Using TEM and STEM-EELS the structure and Mn valence of LixMn2O4-nanoparticles are investigated for different particle sizes and varying lithium content. Initial HR-TEM studies reveal no detectable changes in the particle surfaces as a result of lithiation cycles. In addition, TEM techniques are used to detect morphological changes in the active material after catalysing the oxygen evolution reaction with the aim to understand the underlying mechanisms.