Andreas E. Bumberger
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View article: Strain evolution in La0.6Sr0.4CoO3−<i>δ</i> and SrTi0.3Fe0.7O3−<i>δ</i> multilayer systems
Strain evolution in La0.6Sr0.4CoO3−<i>δ</i> and SrTi0.3Fe0.7O3−<i>δ</i> multilayer systems Open
In this work, we investigated La0.6Sr0.4CoO3−δ / SrTi0.3Fe0.7O3−δ multilayer systems with different layer thicknesses. Reciprocal space mapping showed splitting of the reflections in the sample with 5 nm layers while for 15 nm thick layers…
View article: Structural Characterization of La0.6Sr0.4CoO3−δ Thin Films Grown on (100)-, (110)-, and (111)-Oriented La0.95Sr0.05Ga0.95Mg0.05O3−δ
Structural Characterization of La0.6Sr0.4CoO3−δ Thin Films Grown on (100)-, (110)-, and (111)-Oriented La0.95Sr0.05Ga0.95Mg0.05O3−δ Open
In this study, a detailed structural characterization of epitaxial La0.6Sr0.4CoO3−δ (LSC) films grown in (100), (110), and (111) orientations was conducted. LSC is a model air electrode material in solid oxide fuel and electrolysis cells a…
View article: Transmission line revisited – the impedance of mixed ionic and electronic conductors
Transmission line revisited – the impedance of mixed ionic and electronic conductors Open
A highly intuitive, yet physically meaningful approach to understanding the impedance of MIECs based on a four-terminal transmission line model.
View article: Defect Chemistry of Spinel Cathode Materials─A Case Study of Epitaxial LiMn<sub>2</sub>O<sub>4</sub> Thin Films
Defect Chemistry of Spinel Cathode Materials─A Case Study of Epitaxial LiMn<sub>2</sub>O<sub>4</sub> Thin Films Open
Spinels of the general formula Li2-δM2O4 are an essential class of cathode materials for Li-ion batteries, and their optimization in terms of electrode potential, accessible capacity, and charge/discharge kinetics relies on an accurate und…
View article: Electron beam-induced brownmillerite–perovskite phase transition in La0.6Sr0.4CoO3−<b> <i>δ</i> </b>
Electron beam-induced brownmillerite–perovskite phase transition in La0.6Sr0.4CoO3−<b> <i>δ</i> </b> Open
The electron beam, during high-resolution transmission electron microscopy, was employed to induce a phase transition in La0.6Sr0.4CoO2.5 (LSC) from a brownmillerite ordering to an oxygen deficient perovskite structure. Prior to irradiatio…
View article: Closed-Pore Formation in Oxygen Electrodes for Solid Oxide Electrolysis Cells Investigated by Impedance Spectroscopy
Closed-Pore Formation in Oxygen Electrodes for Solid Oxide Electrolysis Cells Investigated by Impedance Spectroscopy Open
Electrochemical impedance spectroscopy was used to investigate the chemical capacitance of La0.6Sr0.4CoO3-δ (LSC) thin-film electrodes under anodic polarization (i.e., in the electrolysis mode). For this purpose, electrodes with different …
View article: Chemical capacitance measurements reveal the impact of oxygen vacancies on the charge curve of LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4−<i>δ</i></sub> thin films
Chemical capacitance measurements reveal the impact of oxygen vacancies on the charge curve of LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4−<i>δ</i></sub> thin films Open
Chemical capacitance measurements reveal the impact of oxygen vacancies on the electrochemical properties of epitaxial LiNi 0.5 Mn 1.5 O 4− δ thin films. Oxygen deficiency not only impacts the amount of redox active Mn, but also promotes e…
View article: Surface Chemistry and Degradation Processes of Dense La<sub>0.6</sub>Sr<sub>0.4</sub>CoO<sub>3–δ </sub> Thin Film Electrodes
Surface Chemistry and Degradation Processes of Dense La<sub>0.6</sub>Sr<sub>0.4</sub>CoO<sub>3–δ </sub> Thin Film Electrodes Open
The changes of the surface morphology and the surface chemistry of LSC thin films grown on different substrates were tracked for 100 hours under SOFC operation conditions. Atomic force microscopy was used to monitor the formation of partic…
View article: <i>In situ</i>electrochemical observation of anisotropic lattice contraction of La<sub>0.6</sub>Sr<sub>0.4</sub>FeO<sub>3−<i>δ</i></sub>electrodes during pulsed laser deposition
<i>In situ</i>electrochemical observation of anisotropic lattice contraction of La<sub>0.6</sub>Sr<sub>0.4</sub>FeO<sub>3−<i>δ</i></sub>electrodes during pulsed laser deposition Open
The electrochemical effects of anisotropic lattice deformation during La 0.6 Sr 0.4 FeO 3− δ growth by pulsed laser deposition are investigated by in situ impedance spectroscopy.
View article: Mass and Charge Transport in Li<sub>1−δ</sub>CoO<sub>2</sub> Thin Films─A Complete Set of Properties and Its Defect Chemical Interpretation
Mass and Charge Transport in Li<sub>1−δ</sub>CoO<sub>2</sub> Thin Films─A Complete Set of Properties and Its Defect Chemical Interpretation Open
Lithium insertion materials are an essential class of mixed ionic and electronic conductors, and their electrochemical properties depend on the resistive and capacitive interplay of ions and electrons. However, complete sets of the corresp…
View article: Formation and Detection of High-Pressure Oxygen in Closed Pores of La<sub>0.6</sub>Sr<sub>0.4</sub>CoO<sub>3−δ</sub> Solid Oxide Electrolysis Anodes
Formation and Detection of High-Pressure Oxygen in Closed Pores of La<sub>0.6</sub>Sr<sub>0.4</sub>CoO<sub>3−δ</sub> Solid Oxide Electrolysis Anodes Open
The chemical capacitance of La0.6Sr0.4CoO3-δ (LSC) thin film microelectrodes with different microstructures was investigated upon varying anodic DC voltages. Dense and porous electrodes (open porosity) were prepared by using different para…
View article: Combining electrochemical and quantitative elemental analysis to investigate the sulfur poisoning process of ceria thin film fuel electrodes
Combining electrochemical and quantitative elemental analysis to investigate the sulfur poisoning process of ceria thin film fuel electrodes Open
This work deals with the effect of sulfur incorporation into model-type GDC thin films on their in-plane ionic conductivity.
View article: Identifying Contact Resistances in High-Voltage Cathodes by Impedance Spectroscopy
Identifying Contact Resistances in High-Voltage Cathodes by Impedance Spectroscopy Open
LiNi0.5Mn1.5O4 (LNMO) cathodes cycled versus a graphite anode at elevated temperatures usually show severe capacity fading upon extended charge/discharge cycling. In the literature, the impedance increase at the cathode is often related to…