A5021753479- Electrocatalysts for Energy Conversion
- Electronic and Structural Properties of Oxides
- Electrochemical Analysis and Applications
- Magnetic and transport properties of perovskites and related materials
- High Entropy Alloys Studies
- Perovskite Materials and Applications
- Advanced Condensed Matter Physics
- Transition Metal Oxide Nanomaterials
- Gas Sensing Nanomaterials and Sensors
- Fuel Cells and Related Materials
- Advancements in Solid Oxide Fuel Cells
- Conducting polymers and applications
- Copper-based nanomaterials and applications
- Advanced battery technologies research
- Magneto-Optical Properties and Applications
- Magnetic Properties of Alloys
- ZnO doping and properties
- Advanced Memory and Neural Computing
- Ga2O3 and related materials
University of Twente
2022-2025
High-entropy materials are an emerging pathway in the development of high-activity (electro)catalysts because inherent tunability and coexistence multiple potential active sites, which may lead to earth-abundant catalyst for energy-efficient electrochemical energy storage. In this report, we identify how multication composition high-entropy perovskite oxides (HEO) contributes high catalytic activity oxygen evolution reaction (OER), i.e., key kinetically limiting half-reaction several...
To reach a long term viable green hydrogen economy, rational design of active oxygen evolution reaction (OER) catalysts is critical. An important hurdle in this originates from the fact that reactants are singlet molecules, whereas molecule has triplet ground state with parallel spin alignment, implying magnetic order catalyst essential. Accordingly, multiple experimentalists reported positive effect external fields on OER activity ferromagnetic catalysts. However, it remains challenge to...
Electrocatalysts are the cornerstone in transition to sustainable energy technologies and chemical processes. Surface transformations under operation conditions dictate activity stability. However, dependence of surface structure transformation on exposed crystallographic facet remains elusive, impeding rational catalyst design. We investigate (001), (110) (111) facets a LaNiO3-δ electrocatalyst for water oxidation using electrochemical measurements, X-ray spectroscopy, density functional...
Abstract The wide tunability of strongly correlated transition metal (TM) oxides stems from their complex electronic properties and the coupled degrees freedom. Among perovskite family, LaMO 3 (M = Ti-Ni) allows an M-dependent systematic study structure within same-structure-family motif. While most studies have been focusing on 3d TMs oxygen sites, role rare-earth site has far less explored. In this work, we use resonant inelastic X-ray scattering (RIXS) at lanthanum N 4,5 edges density...
The development of efficient electrocatalysts in water electrolysis is essential to decrease the high overpotentials, especially at anode where oxygen evolution reaction (OER) takes place. However, establishing catalyst design rules find optimal a substantial challenge. Complex oxides, which are often considered as suitable OER catalysts, can exhibit vastly different conductivity values, making it challenging separate intrinsic catalytic activities from internal transport limitations. Here,...
We study the electrocatalytic oxygen evolution reaction using in situ X-ray absorption spectroscopy (XAS) to track dynamics of valence state and covalence metal ions LaFeO3 LaFeO3/LaNiO3 thin films. The active materials are 8 unit cells grown epitaxially on 100 nm conductive La0.67Sr0.33MnO3 layers pulsed laser deposition (PLD). perovskite supported monolayer Ca2Nb3O10 nanosheet-buffered SiNx membranes. Fe Ni K-edges XAS spectra were measured from backside membrane fluorescence yield...
Understanding and tuning epitaxial complex oxide films are crucial in controlling the behavior of devices catalytic processes. Substrate-induced strain, doping, layer growth known to influence electronic magnetic properties bulk film. In this study, we demonstrate a clear distinction between surface thin La0.67Sr0.33MnO3 terms chemical composition, disorder, morphology. We use combined experimental approach X-ray-based characterization methods scanning probe microscopy. Using X-ray...
The development of efficient electrocatalysts in water electrolysis is essential to decrease the high overpotentials especially at anode where oxygen evolution reaction (OER) takes place. However, establishing catalyst design rules find optimal a substantial challenge. Complex oxides, which are often considered as suitable OER catalysts, can exhibit vastly different conductivity values, making it challenging separate intrinsic catalytic activities from internal transport limitations. Here,...
Abstract Correlated metals with high carrier density and strongly correlated electron effects provide an alternative route to achieve transparent conducting materials, different from the conventional degenerately doped wide‐bandgap oxides (TCO). The extremely low electrical resistivity optical transparency in ultraviolet‐visible spectral range shown 4d present advantage over TCOs. However, most of are grown epitaxially on single crystal substrates. Here, it has been that Ca 2 Nb 3 O 10...
Vanadium dioxide (VO2) is a popular candidate for electronic and optical switching applications due to its well-known semiconductor-metal transition. Its study notoriously challenging the interplay of long- short-range elastic distortions, as well symmetry change structure changes. The inherent coupling lattice degrees freedom opens avenue toward mechanical actuation single domains. In this work, we show that can manipulate monitor reversible semiconductor-to-metal transition VO2 while...
Gaining insight into the characteristics of epitaxial complex oxide films is essential to control behavior devices and catalytic processes. It known that substrate induced strain, doping, layer growth can affect electronic magnetic properties film's bulk. In this study, we demonstrate a clear distinction between bulk surface thin La0.67Sr0.33MnO3 in terms chemical composition, disorder, morphology. We employed combined experimental approach X-ray based characterization methods scanning probe...
The ‘power-to-hydrogen’ strategy aims at splitting water into O 2 and H via the oxygen hydrogen evolution reactions. complex four-step reaction (OER) limits overall efficiency of production. An important reason low is that production ground-state (triplet) a spin-forbidden reaction: in fact, reactants, OH - or O, are diamagnetic, but final product, , paramagnetic molecule. Recently, this was well-recognized theoretically 1 use spin selective catalysts described as possible way to promote...
To reach a long term viable green hydrogen economy, rational design of active oxygen evolution reaction (OER) catalysts is critical. An important hurdle in this originates from the fact that reactants are singlet molecules, whereas molecule has triplet ground state with parallel spin alignment, implying magnetic order catalyst essential. Accordingly, multiple experimentalists reported positive effect external fields on OER activity ferromagnetic catalysts. However, it remains challenge to...
High-entropy materials are an emerging pathway in the development of high-activity (electro)catalysts because inherent tunability and coexistence multiple potential active sites, which may lead to earth-abundant catalyst for energy-efficient electrochemical energy storage. In this report, we identify how multication composition high-entropy perovskite oxides (HEO) contributes high catalytic activity oxygen evolution reaction (OER), i.e., key kinetically limiting half-reaction several...
High entropy materials are a new pathway in the development of high-activity (electro )catalysts because inherent tunability and coexistence multiple potential active sites, which may lead to earth-abundant catalyst for energy-efficient electrochemical energy storage. In this report, we identify how multi-cation composition high perovskite oxides (HEO) contributes catalytic activity oxygen evolution reaction (OER), i.e. key kinetically limiting half-reactions several conversion technologies,...
Vanadium dioxide (VO2) is a popular candidate for electronic and optical switching applications due to its well-known semiconductor-metal transition. Its study notoriously challenging the interplay of long short range elastic distortions, as well symmetry change, structure changes. The inherent coupling lattice degrees freedom opens avenue towards mechanical actuation single domains. In this work, we show that can manipulate monitor reversible semiconductor-to-metal transition VO2 while...