Jürgen Fleig
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View article: Femtosecond Laser Generation of LaCoO <sub>3</sub> Perovskite Nanocatalysts for Preferential CO Oxidation
Femtosecond Laser Generation of LaCoO <sub>3</sub> Perovskite Nanocatalysts for Preferential CO Oxidation Open
Green synthesis and defect engineering of LaCoO3 model nanocatalysts by femtosecond pulsed laser ablation in liquid (fs-PLAL) led to the formation of two types of nanoperovskites: stoichiometric LaCoO3 and nonstoichiometric cobalt-rich nan…
View article: The Oxygen Partial Pressure Dependence of Space Charges at SrTiO<sub>3</sub>|Mixed Ionic Electronic Conducting Oxide Heterojunctions
The Oxygen Partial Pressure Dependence of Space Charges at SrTiO<sub>3</sub>|Mixed Ionic Electronic Conducting Oxide Heterojunctions Open
The electrical and electrochemical properties of mixed conducting oxides often depend on the oxygen partial pressure p (O 2 ) and numerous studies have dealt with the p (O 2 ) dependencies found in bulk materials. However, measurements reg…
View article: Reducibility, Adsorption Energies, Surface Acidity - Fundamental Material Properties for Fast Oxygen Exchange
Reducibility, Adsorption Energies, Surface Acidity - Fundamental Material Properties for Fast Oxygen Exchange Open
Recent studies have shown that surface modifications can be used to tune the high temperature oxygen exchange kinetics of a single material systematically over several orders of magnitude, shifting the focus of predictive material design f…
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: Space Charges at SrTiO<sub>3</sub>|Mixed Ionic and Electronic Conducting Oxide Heterojunctions and Their Relation to Defect Chemistry
Space Charges at SrTiO<sub>3</sub>|Mixed Ionic and Electronic Conducting Oxide Heterojunctions and Their Relation to Defect Chemistry Open
Mixed ionic and electronic conductors (MIECs) are a highly relevant material class in the field of solid-oxide cells and are, for example, promising candidates for electrodes with fast interfacial reaction kinetics. While there are many st…
View article: Reducibility, adsorption energies, surface acidity – fundamental material properties for fast oxygen exchange
Reducibility, adsorption energies, surface acidity – fundamental material properties for fast oxygen exchange Open
Combining a comprehensive discussion of literature with new mechanistic insights, we derive two fundamental design principles for material systems with optimal oxygen exchange kinetics: a shallow O 2p band center and a low work function.
View article: UHV-based analytics with electrochemical oxygen activity control
UHV-based analytics with electrochemical oxygen activity control Open
With the right electrochemical cell design, the oxygen activity in an oxide can be controlled precisely, even for UHV-based surface analytics.
View article: Preparation and interfacial engineering of sputtered electrolytes for thin film oxygen ion batteries
Preparation and interfacial engineering of sputtered electrolytes for thin film oxygen ion batteries Open
Interface engineering reduces interfacial resistance in yttria-stabilized zirconia electrolyte thin films, enabling efficient low-temperature oxygen ion battery operation.
View article: Exploring the potential of combining over- and under-stoichiometric MIEC materials for Oxygen-Ion Batteries
Exploring the potential of combining over- and under-stoichiometric MIEC materials for Oxygen-Ion Batteries Open
The increasing demand for energy storage solutions has spurred intensive research into next-generation battery technologies. Oxygen-ion batteries (OIBs), which leverage mixed ionic-electronic conducting (MIEC) oxides, have emerged as promi…
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: Mechanistic insights into photo-current enhancement in photo-active SrTiO3 heterojunctions under UV illumination
Mechanistic insights into photo-current enhancement in photo-active SrTiO3 heterojunctions under UV illumination Open
Photo-active heterojunctions were prepared by growing thin La0.9Sr0.1CrO3-δ films on SrTiO3 (STO) single crystals substrates via pulsed laser deposition. The photo-electrochemical characteristics of these heterojunctions under UV illuminat…
View article: Oxygen surface exchange kinetics of La<sub>1−<i>x</i></sub>Sr<sub><i>x</i></sub>CoO<sub>3–<i>δ</i></sub> thin-films decorated with binary oxides: links between acidity, strontium doping, and reaction kinetics
Oxygen surface exchange kinetics of La<sub>1−<i>x</i></sub>Sr<sub><i>x</i></sub>CoO<sub>3–<i>δ</i></sub> thin-films decorated with binary oxides: links between acidity, strontium doping, and reaction kinetics Open
Recent study shows the enhancement of oxygen exchange kinetics of oxygen electrodes using oxides selected using Smith acidity. However, what are the limits to this approach?
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: A High Temperature Harvestorer Based on a Photovoltaic Cell and an Oxygen Ion Battery
A High Temperature Harvestorer Based on a Photovoltaic Cell and an Oxygen Ion Battery Open
Hybrid devices for combined energy harvesting and storage, i.e., harvestorers, are attractive solutions for powering small autonomous devices (e.g., "smart appliances", Internet of things nodes), which are ever more prominent as the digita…
View article: Engineering surface dipoles on mixed conducting oxides with ultra-thin oxide decoration layers
Engineering surface dipoles on mixed conducting oxides with ultra-thin oxide decoration layers Open
Improving materials for energy conversion and storage devices is deeply connected with an optimization of the surfaces of these materials. Surface modification has therefore emerged as a very promising strategy on the way to enhance modern…
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: Dislocation‐tuned electrical conductivity in solid electrolytes (9YSZ): A micro‐mechanical approach
Dislocation‐tuned electrical conductivity in solid electrolytes (9YSZ): A micro‐mechanical approach Open
Tailoring the electrical conductivity of functional ceramics by introducing dislocations is a comparatively recent research focus, and its merits were demonstrated through mechanical means. Especially bulk deformation at high temperatures …
View article: A Guideline to Mitigate Interfacial Degradation Processes in Solid‐State Batteries Caused by Cross Diffusion
A Guideline to Mitigate Interfacial Degradation Processes in Solid‐State Batteries Caused by Cross Diffusion Open
Diffusion of transition metals across the cathode–electrolyte interface is identified as a key challenge for the practical realization of solid‐state batteries. This is related to the formation of highly resistive interphases impeding the …
View article: Crystal-Orientation-Dependent Oxygen Exchange Kinetics on Mixed Conducting Thin-Film Surfaces Investigated by <i>In Situ</i> Studies
Crystal-Orientation-Dependent Oxygen Exchange Kinetics on Mixed Conducting Thin-Film Surfaces Investigated by <i>In Situ</i> Studies Open
The oxygen exchange kinetics and the surface chemistry of epitaxially grown, dense La0.6Sr0.4CoO3-δ (LSC) thin films in three different orientations, (001), (110), and (111), were investigated by means of in situ impedance spectroscopy dur…
View article: Utilizing oxygen gas storage in rechargeable oxygen ion batteries
Utilizing oxygen gas storage in rechargeable oxygen ion batteries Open
The potentiality of mixed conducting oxides as electrodes in rechargeable oxygen ion batteries is exemplified by impedance measurements and galvanostatic cycling. Porous La0.6Sr0.4CoO3−δ (LSC) thin film electrodes were prepared on yttria-s…
View article: Electrochemical Stability Window and Electrolyte Breakdown Mechanisms of Lithium Lanthanum Titanate
Electrochemical Stability Window and Electrolyte Breakdown Mechanisms of Lithium Lanthanum Titanate Open
Perovskite-type La 0.57 Li 0.29 TiO 3 (LLTO) is a promising solid electrolyte material with high Li-ion conductivity. However, its experimental electrochemical stability window is not precisely known, and thus the compatibility with potent…
View article: Surface Decorations on Mixed Ionic and Electronic Conductors: Effects on Surface Potential, Defects, and the Oxygen Exchange Kinetics
Surface Decorations on Mixed Ionic and Electronic Conductors: Effects on Surface Potential, Defects, and the Oxygen Exchange Kinetics Open
The oxygen exchange kinetics of epitaxial Pr0.1Ce0.9O2-δ electrodes was modified by decoration with submonolayer amounts of different basic (SrO, CaO) and acidic (SnO2, TiO2) binary oxides. The oxygen exchange reaction (OER) rate and the t…
View article: Defect Chemistry and Mixed Conduction in Lithium Lanthanum Titanate During the Transition from Electrolyte to Anode Material
Defect Chemistry and Mixed Conduction in Lithium Lanthanum Titanate During the Transition from Electrolyte to Anode Material Open
Lithium lanthanum titanate Li 0.29+ δ La 0.57 TiO 3 (LLTO) is a promising material in Li ion battery application, due to its ambient stability and high ionic conductivity. When it is subjected to a high Li chemical potential, additional Li…
View article: Roadmap on exsolution for energy applications
Roadmap on exsolution for energy applications Open
Over the last decade, exsolution has emerged as a powerful new method for decorating oxide supports with uniformly dispersed nanoparticles for energy and catalytic applications. Due to their exceptional anchorage, resilience to various deg…
View article: Effect of pulse-current-based protocols on the lithium dendrite formation and evolution in all-solid-state batteries
Effect of pulse-current-based protocols on the lithium dendrite formation and evolution in all-solid-state batteries Open
Understanding the cause of lithium dendrites formation and propagation is essential for developing practical all-solid-state batteries. Li dendrites are associated with mechanical stress accumulation and can cause cell failure at current d…