Max Baumung
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View article: Manganese dissolution in alkaline medium with and without concurrent oxygen evolution in LiMn<sub>2</sub>O<sub>4</sub>
Manganese dissolution in alkaline medium with and without concurrent oxygen evolution in LiMn<sub>2</sub>O<sub>4</sub> Open
Manganese oxides such as LiMn 2 O 4 exhibit two distinct Mn dissolution processes; one independent of oxygen evolution and the other associated with it. Less Mn 4+ before the onset of the OER lowers the Mn dissolution rate.
View article: Manganese Dissolution in alkaline medium with and without concurrent oxygen evolution in LiMn2O4
Manganese Dissolution in alkaline medium with and without concurrent oxygen evolution in LiMn2O4 Open
Manganese dissolution during the oxygen evolution reaction (OER) has been a persistent challenge that impedes the practical implementation of Mn-based electrocatalysts including the LixMn2O4 system in aqueous alkaline electrolyte. The inve…
View article: Manganese Dissolution in alkaline medium with and without concurrent oxygen evolution in LiMn$_2$O$_4$
Manganese Dissolution in alkaline medium with and without concurrent oxygen evolution in LiMn$_2$O$_4$ Open
Manganese dissolution during the oxygen evolution reaction (OER) has been a persistent challenge that impedes the practical implementation of Mn-based electrocatalysts including the LiMn$_x$O$_4$ system in aqueous alkaline electrolyte. The…
View article: A Modular Double Electrode Flow Cell with Exchangeable Generator and Detector Electrodes
A Modular Double Electrode Flow Cell with Exchangeable Generator and Detector Electrodes Open
Generator‐collector experiments offer insights into the mechanisms of electrochemical reactions by correlating the product and generator currents. Most commonly, these experiments are performed using commercially‐available rotating ring‐di…
View article: Correlations between manganese valence and catalytic oxygen evolution of LixMn2O4
Correlations between manganese valence and catalytic oxygen evolution of LixMn2O4 Open
This doctoral thesis deals with the mechanistic insights in catalysing the oxygen evolution reaction (OER) in alkaline solution by using a tuneable LixMn2O4 spinel as a model catalyst, motivated by the challenging step to control the OER f…
View article: Characterization of a Modular Flow Cell System for Electrocatalytic Experiments and Comparison to a Commercial RRDE System
Characterization of a Modular Flow Cell System for Electrocatalytic Experiments and Comparison to a Commercial RRDE System Open
Generator-collector experiments offer insights into the mechanisms of electrochemical reactions by correlating the product and generator currents. Most commonly, these experiments are performed using a rotating ring-disk electrode (RRDE). …
View article: Characterization of a Modular Flow Cell System for Electrocatalytic Experiments and Comparison to a Commercial RRDE System
Characterization of a Modular Flow Cell System for Electrocatalytic Experiments and Comparison to a Commercial RRDE System Open
Generator-collector experiments offer insights into the mechanisms of electrochemical reactions by correlating the product and generator currents. Most commonly, these experiments are performed using a rotating ring-disk electrode (RRDE). …
View article: Characterization of a modular flow cell system for electrocatalytic experiments and comparison to a commercial RRDE system
Characterization of a modular flow cell system for electrocatalytic experiments and comparison to a commercial RRDE system Open
Generator-collector experiments offer insights into the mechanisms of electrochemical reactions by correlating the product and generator currents. Most commonly, these experiments are performed using a rotating ring-disk electrode (RRDE). …
View article: A criticial view on e$_g$ occupancy as a descriptor for oxygen evolution catalytic activity in LiMn$_2$O$_4$ nanoparticles
A criticial view on e$_g$ occupancy as a descriptor for oxygen evolution catalytic activity in LiMn$_2$O$_4$ nanoparticles Open
We investigate the effect of the surface electronic structure and composition of LiMn$_2$O$_4$ nanoparticles on the electrocatalytic oxygen evolution reaction (OER). Scanning transmission electron microscopy (STEM) electron energy loss spe…
View article: Cover Feature: Undesired Bulk Oxidation of LiMn<sub>2</sub>O<sub>4</sub> Increases Overpotential of Electrocatalytic Water Oxidation in Lithium Hydroxide Electrolytes (ChemPhysChem 22/2019)
Cover Feature: Undesired Bulk Oxidation of LiMn<sub>2</sub>O<sub>4</sub> Increases Overpotential of Electrocatalytic Water Oxidation in Lithium Hydroxide Electrolytes (ChemPhysChem 22/2019) Open
The Cover Feature illustrates the interplay between the activity for the oxygen evolution reaction and the battery charge state of LiMn2O4 when used as a catalyst. The electrocatalyst remains in the discharged battery state at pH 14, where…
View article: Undesired Bulk Oxidation of LiMn<sub>2</sub>O<sub>4</sub> Increases Overpotential of Electrocatalytic Water Oxidation in Lithium Hydroxide Electrolytes
Undesired Bulk Oxidation of LiMn<sub>2</sub>O<sub>4</sub> Increases Overpotential of Electrocatalytic Water Oxidation in Lithium Hydroxide Electrolytes Open
Chemical and structural changes preceding electrocatalysis obfuscate the nature of the active state of electrocatalysts for the oxygen evolution reaction (OER), which calls for model systems to gain systematic insight. We investigated the …
View article: A zone-plate-based two-color spectrometer for indirect X-ray absorption spectroscopy
A zone-plate-based two-color spectrometer for indirect X-ray absorption spectroscopy Open
X-ray absorption spectroscopy (XAS) is a powerful element-specific technique that allows the study of structural and chemical properties of matter. Often an indirect method is used to access the X-ray absorption (XA). This work demonstrate…
View article: Influence of particle size on the apparent electrocatalytic activity of LiMn<sub>2</sub>O<sub>4</sub> for oxygen evolution
Influence of particle size on the apparent electrocatalytic activity of LiMn<sub>2</sub>O<sub>4</sub> for oxygen evolution Open
Particle size influences the product current densities of LiMn2O4 where smaller particles showed higher faradic efficiency for the OER.