Felix Gunkel
YOU?
Author Swipe
View article: Topotactic Phase Transition in Epitaxial La <sub>0.7</sub> Sr <sub>0.3</sub> MnO <sub>3‐δ</sub> Films Induced by Oxygen Getter Assisted Thermal Annealing
Topotactic Phase Transition in Epitaxial La <sub>0.7</sub> Sr <sub>0.3</sub> MnO <sub>3‐δ</sub> Films Induced by Oxygen Getter Assisted Thermal Annealing Open
Oxygen vacancies play a crucial role in controlling the physical properties of complex oxides. In La 0.7 Sr 0.3 MnO 3‐δ , the topotactic phase transition from Perovskite (PV) to Brownmillerite (BM) can be triggered, e.g., via oxygen remova…
View article: Spin Matters: A Multidisciplinary Roadmap to Understanding Spin Effects in Oxygen Evolution Reaction During Water Electrolysis
Spin Matters: A Multidisciplinary Roadmap to Understanding Spin Effects in Oxygen Evolution Reaction During Water Electrolysis Open
A central challenge in water electrolysis lies with the oxygen evolution reaction (OER) where the formation of molecular oxygen (O 2 ) is hindered by the constraint of angular momentum conservation. While the reactants OH − or H 2 O are di…
View article: Chemical termination and interfacial redox behavior of freestanding SrTiO3
Chemical termination and interfacial redox behavior of freestanding SrTiO3 Open
Tailoring oxide heterointerfaces has sparked the search for electronic and ionic phenomena in low-dimensional, confined systems. The fabrication of freestanding oxide membranes has further expanded the possible fields of application. Based…
View article: Atomic‐Scale Insights into Nanoparticle Exsolution at Dislocations in Dislocation‐Engineered Catalysts
Atomic‐Scale Insights into Nanoparticle Exsolution at Dislocations in Dislocation‐Engineered Catalysts Open
Achieving control over properties such as density and lateral distribution of catalytic nanoparticles under operation conditions is a major challenge for the development of active and durable catalysts, where nanoparticle coarsening is oft…
View article: Topotactic phase transition in epitaxial La0.7Sr0.3MnO3-δ films induced by oxygen getter assisted thermal annealing
Topotactic phase transition in epitaxial La0.7Sr0.3MnO3-δ films induced by oxygen getter assisted thermal annealing Open
Oxygen vacancies play a crucial role in controlling the physical properties of complex oxides. In La0.7Sr0.3MnO3-δ, the topotactic phase transition from Perovskite (PV) to Brownmillerite (BM) can be triggered e.g. via oxygen removal during…
View article: Spin Matters: A Multidisciplinary Roadmap to Understanding Spin Effects in Oxygen Evolution Reaction during Water Electrolysis
Spin Matters: A Multidisciplinary Roadmap to Understanding Spin Effects in Oxygen Evolution Reaction during Water Electrolysis Open
A central challenge in water electrolysis lies with the oxygen evolution reaction (OER) where the formation of molecular oxygen (O₂) is hindered by the constraint of angular momentum conservation. While the reactants OH⁻ or H₂O are diamagn…
View article: Direct atomic-scale investigation of the coarsening mechanisms of exsolved catalytic Ni nanoparticles
Direct atomic-scale investigation of the coarsening mechanisms of exsolved catalytic Ni nanoparticles Open
Exsolution-active catalysts allow for the formation of highly active metallic nanoparticles, yet recent work has shown that their long-term thermal stability remains a challenge. In this work, the dynamics of exsolved Ni nanoparticles are …
View article: Revealing the Intrinsic Oxygen Evolution Reaction Activity of Perovskite Oxides across Conductivity Ranges Using Thin Film Model Systems
Revealing the Intrinsic Oxygen Evolution Reaction Activity of Perovskite Oxides across Conductivity Ranges Using Thin Film Model Systems Open
The development of efficient electrocatalysts in water electrolysis is essential to decrease the high overpotentials, especially at the anode where the oxygen evolution reaction (OER) takes place. However, establishing catalyst design rule…
View article: Chemical Termination and Interfacial Redox Behavior of Freestanding SrTiO3
Chemical Termination and Interfacial Redox Behavior of Freestanding SrTiO3 Open
Tailoring oxide heterointerfaces has sparked the search for electronic and ionic phenomena in low-dimensional, confined systems. The fabrication of freestanding oxide membranes has further expanded the possible fields of application. Based…
View article: Material sustainability evaluation of electrocatalysts in early-stage development
Material sustainability evaluation of electrocatalysts in early-stage development Open
Sustainable energy materials for energy storage applications are crucial for a reliable energy transition. However, evaluating material sustainability in early stages of energy material research is a big challenge, as it is difficult to pr…
View article: Revealing the intrinsic oxygen evolution reaction activity of perovskite oxides across conductivity ranges using thin film model systems
Revealing the intrinsic oxygen evolution reaction activity of perovskite oxides across conductivity ranges using thin film model systems Open
The development of efficient electrocatalysts in water electrolysis is essential to decrease the high overpotentials especially at the anode where the oxygen evolution reaction (OER) takes place. However, establishing catalyst design rules…
View article: Direct Atomic-Scale Investigation of the Coarsening Mechanisms of Exsolved Catalytic Nanoparticles
Direct Atomic-Scale Investigation of the Coarsening Mechanisms of Exsolved Catalytic Nanoparticles Open
Exsolution-active catalysts allow for the formation of highly active metallic nanoparticles, yet their long-term thermal stability remains a challenge. In this work, the dynamics of exsolved Ni nanoparticles are probed in situ with atomica…
View article: La<sub>0.6</sub>Sr<sub>0.4</sub>CoO<sub>3−δ</sub> Films Under Deoxygenation: Magnetic And Electronic Transitions Are Apart from The Structural Phase Transition
La<sub>0.6</sub>Sr<sub>0.4</sub>CoO<sub>3−δ</sub> Films Under Deoxygenation: Magnetic And Electronic Transitions Are Apart from The Structural Phase Transition Open
Topotactic phase transitions induced by changes in the oxygen vacancy concentration can largely alter the physical properties of complex oxides, including electronic and magnetic phases, while maintaining the structural integrity of the cr…
View article: Control of growth kinetics during remote epitaxy of complex oxides on graphene by pulsed laser deposition
Control of growth kinetics during remote epitaxy of complex oxides on graphene by pulsed laser deposition Open
Remote epitaxy through 2D materials opens new opportunities for research and application, overcoming some limitations of classical epitaxy and allowing the creation of freestanding layers. However, using graphene as a 2D interlayer for rem…
View article: Heterogeneous Integration of Graphene and HfO<sub>2</sub> Memristors
Heterogeneous Integration of Graphene and HfO<sub>2</sub> Memristors Open
The past decade has seen a growing trend toward utilizing (quasi) van der Waals growth for the heterogeneous integration of various materials for advanced electronics. In this work, pulsed‐laser deposition is used to grow HfO 2 thin films …
View article: Thermal stability and coalescence dynamics of exsolved metal nanoparticles at charged perovskite surfaces
Thermal stability and coalescence dynamics of exsolved metal nanoparticles at charged perovskite surfaces Open
Exsolution reactions enable the synthesis of oxide-supported metal nanoparticles, desir- able as catalysts in green energy conversion technologies. It is crucial to precisely tai- lor the nanoparticle characteristics to tune the catalysts’…
View article: Separating the Effects of Band Bending and Covalency in Hybrid Perovskite Oxide Electrocatalyst Bilayers for Water Electrolysis
Separating the Effects of Band Bending and Covalency in Hybrid Perovskite Oxide Electrocatalyst Bilayers for Water Electrolysis Open
Testing single crystalline epitaxial thin films as model systems for metal oxide electrocatalysts in the oxygen evolution reaction (OER) enables differentiating the OER descriptors such as crystal facet orientation, surface chemical compos…
View article: Mid infrared near-field fingerprint spectroscopy of the 2D electron gas in LaAlO$_3$/SrTiO$_3$ at low temperatures
Mid infrared near-field fingerprint spectroscopy of the 2D electron gas in LaAlO$_3$/SrTiO$_3$ at low temperatures Open
Confined electron systems, such as 2D electron gases (2DEGs), 2D materials, or topological insulators show great technological promise but their susceptibility to defects often results in nanoscale inhomogeneities with unclear origins. Sca…
View article: A High-Entropy Oxide as High-Activity Electrocatalyst for Water Oxidation
A High-Entropy Oxide as High-Activity Electrocatalyst for Water Oxidation Open
High-entropy materials are an emerging pathway in the development of high-activity (electro)catalysts because of the inherent tunability and coexistence of multiple potential active sites, which may lead to earth-abundant catalyst material…
View article: Powering internet-of-things from ambient energy: a review
Powering internet-of-things from ambient energy: a review Open
Internet-of-thing (IoT) is an assembly of devices that collect and share data with other devices and communicate via the internet. This massive network of devices, generates and communicates data and is the key to the value in IoT, allowin…
View article: Space charge governs the kinetics of metal exsolution
Space charge governs the kinetics of metal exsolution Open
Nanostructured composite electrode materials play a major role in the field of catalysis and electrochemistry. Self‐assembly of metallic nanoparticles on oxide supports via metal exsolution relies on the transport of reducible dopants towa…
View article: Reversibility limitations of metal exsolution reactions in niobium and nickel co-doped strontium titanate
Reversibility limitations of metal exsolution reactions in niobium and nickel co-doped strontium titanate Open
Reversible metal exsolution and re-dissolution of metal cations in perovskite host lattices hold the potential for the development of regenerable metal-oxide catalysts. However, the reversibility of metal exsolution reactions is often limi…
View article: Understanding Structural Incorporation of Oxygen Vacancies in Perovskite Cobaltite Films and Potential Consequences for Electrocatalysis
Understanding Structural Incorporation of Oxygen Vacancies in Perovskite Cobaltite Films and Potential Consequences for Electrocatalysis Open
Owing to their excellent mixed-ionic and electronic conductivity, fast oxygen kinetics, and cost efficiency, layered oxygen-deficient perovskite oxides hold great potential as highly efficient cathodes for solid oxide fuel cells and anodes…
View article: Enhanced metal exsolution at the non-polar (001) surfaces of multi-faceted epitaxial thin films
Enhanced metal exsolution at the non-polar (001) surfaces of multi-faceted epitaxial thin films Open
Metal exsolution is a dynamic process driven under a reducing atmosphere and at elevated temperatures that results in the self-assembly of nanoparticles at the surface of complex perovskite catalysts. The nanoparticle characteristics of me…
View article: A high entropy oxide as high-activity electrocatalyst for water oxidation
A high entropy oxide as high-activity electrocatalyst for water oxidation Open
High entropy materials are a new pathway in the development of high-activity (electro )catalysts because of the inherent tunability and coexistence of multiple potential active sites, which may lead to earth-abundant catalyst materials for…