Armin Feldhoff
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View article: Enhancing the hydrogen tolerance of La0.6Ca0.4Co0.2Fe0.8O3– oxygen transport membranes with the substitution of 10 % Mn at the B site for plasma assisted CO2 conversion
Enhancing the hydrogen tolerance of La0.6Ca0.4Co0.2Fe0.8O3– oxygen transport membranes with the substitution of 10 % Mn at the B site for plasma assisted CO2 conversion Open
The tendency of mixed ionic electronic conducting (MIEC) materials to be highly selective towards oxygen allows for their use as oxygen transport membranes (OTMs). To be used as OTMs in plasma assisted CO2 conversion and H2 utilisation app…
View article: Tailoring the Anisotropic Oxygen Transport Properties in Bulk Ceramic Membranes Based on a Ruddlesden–Popper Oxide by Applying Magnetic Fields
Tailoring the Anisotropic Oxygen Transport Properties in Bulk Ceramic Membranes Based on a Ruddlesden–Popper Oxide by Applying Magnetic Fields Open
Textured Nd 2 NiO 4+ δ bulk ceramic membranes are fabricated via slip casting in a 0.9 T magnetic field generated by neodymium magnets. This process aligns the oxide grains with their easy‐magnetization c ‐axis parallel to the applied magn…
View article: Asymmetric structuring of ceramic composite via co‐electrospun sodium cobaltite and calcium cobaltite nanoribbons
Asymmetric structuring of ceramic composite via co‐electrospun sodium cobaltite and calcium cobaltite nanoribbons Open
An asymmetrically structured sodium cobaltite–calcium cobaltite ceramic composite with enhanced texture was synthesized using co‐electrospinning of nanoribbons and rapid thermal processing (RTP). Long‐term stability tests revealed that emb…
View article: High‐performance thermoelectric calcium cobaltite nanoribbon ceramic via electrospinning and dual spark plasma texturing
High‐performance thermoelectric calcium cobaltite nanoribbon ceramic via electrospinning and dual spark plasma texturing Open
High‐performance polycrystalline calcium cobaltite ceramic was synthesized via electrospinning of nanoribbons, followed by dual‐process compaction using spark plasma sintering and edge‐free spark plasma texturing. The combination of nanori…
View article: Advances in Texturing and Thermoelectric Properties of a Calcium Cobaltite Ceramic via Combined Spark Plasma Sintering and Spark Plasma Texturing
Advances in Texturing and Thermoelectric Properties of a Calcium Cobaltite Ceramic via Combined Spark Plasma Sintering and Spark Plasma Texturing Open
Misfit‐layered calcium cobaltite [Ca 2 CoO 3‐ δ ] 0.62 [CoO 2 ] is an outstanding p ‐type semiconducting thermoelectric with strong anisotropic properties. Texture engineering is crucial for enhancing its thermoelectric performance in poly…
View article: Enhanced Performance of La<sub>2</sub>NiO<sub>4+δ</sub> Oxygen-Transporting Membranes Using Crystal Facet Engineering via Microemulsion-Based Synthesis
Enhanced Performance of La<sub>2</sub>NiO<sub>4+δ</sub> Oxygen-Transporting Membranes Using Crystal Facet Engineering via Microemulsion-Based Synthesis Open
La2NiO4+δ nanorods, synthesized via reverse microemulsion─a crystal facet engineering method─served as building blocks for developing oxygen transport membranes. Comparisons were drawn with ceramic membranes derived from commercial La2NiO4…
View article: Advanced thermoelectric performance of a textured ceramic composite: Encapsulation of Na <i> <sub>x</sub> </i> CoO <sub>2</sub> into a triple‐phase matrix
Advanced thermoelectric performance of a textured ceramic composite: Encapsulation of Na <i> <sub>x</sub> </i> CoO <sub>2</sub> into a triple‐phase matrix Open
Sodium cobaltite (Na x CoO 2 ) is one of the most renowned and thermoelectrically promising p ‐type cobalt oxide materials, showing exceptional performance in this domain. Nonetheless, its thermal instability in air renders it unsuitable f…
View article: Towards the development of textured polycrystalline La2NiO4+δ membranes and their oxygen-transporting properties
Towards the development of textured polycrystalline La2NiO4+δ membranes and their oxygen-transporting properties Open
Textured La 2 NiO 4+ δ membranes were fabricated by pressureless sintering in air using uniaxially pressed powder mixtures consisting of fine-grained equiaxial La 2 NiO 4+ δ matrix particles and plate-like La 2 NiO 4+ δ template particles …
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View article: Preparation of ZIF-62 polycrystalline and glass membranes for helium separation
Preparation of ZIF-62 polycrystalline and glass membranes for helium separation Open
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Cover Photograph: Oxide/oxide ceramic matrix composites reinforced with three-dimensional fiber preform were fabricated by repeating slurry infiltration and sintering (SIS) cycles.The 3D microstructures by XCT on the cover show homogeneous…
View article: Inside Cover: Multiplying Oxygen Permeability of a Ruddlesden‐Popper Oxide by Orientation Control via Magnets (Angew. Chem. Int. Ed. 8/2024)
Inside Cover: Multiplying Oxygen Permeability of a Ruddlesden‐Popper Oxide by Orientation Control via Magnets (Angew. Chem. Int. Ed. 8/2024) Open
Angewandte Chemie International Edition is one of the prime chemistry journals in the world, publishing research articles, highlights, communications and reviews across all areas of chemistry.
View article: Innentitelbild: Multiplying Oxygen Permeability of a Ruddlesden‐Popper Oxide by Orientation Control via Magnets (Angew. Chem. 8/2024)
Innentitelbild: Multiplying Oxygen Permeability of a Ruddlesden‐Popper Oxide by Orientation Control via Magnets (Angew. Chem. 8/2024) Open
Graphical Abstract The Ruddlesden–Popper oxide Nd2NiO4+δ exhibits magnetic anisotropy and oxygen transport anisotropy. Its (a,b)-plane, having oxygen diffusion coefficient and surface exchange coefficient several orders of magnitude higher…
View article: Recycling of Hydrogen Tolerant La0.6ca0.4co0.2fe0.8o3– D Oxygen Transport Membranes with Integrated Life Cycle Assessment for Plasma-Assisted Co2-Conversion
Recycling of Hydrogen Tolerant La0.6ca0.4co0.2fe0.8o3– D Oxygen Transport Membranes with Integrated Life Cycle Assessment for Plasma-Assisted Co2-Conversion Open
View article: Correction: Optimization of misfit calcium cobaltite oxygen electrodes for solid oxide fuel cells through electrospinning processing
Correction: Optimization of misfit calcium cobaltite oxygen electrodes for solid oxide fuel cells through electrospinning processing Open
Correction for ‘Optimization of misfit calcium cobaltite oxygen electrodes for solid oxide fuel cells through electrospinning processing’ by Allan J. M. Araújo et al. , J. Mater. Chem. A , 2024, https://doi.org/10.1039/D4TA04085F.
View article: Multiplying Oxygen Permeability of a Ruddlesden‐Popper Oxide by Orientation Control via Magnets
Multiplying Oxygen Permeability of a Ruddlesden‐Popper Oxide by Orientation Control via Magnets Open
Ruddlesden‐Popper‐type oxides exhibit remarkable chemical stability in comparison to perovskite oxides. However, they display lower oxygen permeability. We present an approach to overcome this trade‐off by leveraging the anisotropic proper…
View article: Multiplying Oxygen Permeability of a Ruddlesden‐Popper Oxide by Orientation Control via Magnets
Multiplying Oxygen Permeability of a Ruddlesden‐Popper Oxide by Orientation Control via Magnets Open
Ruddlesden‐Popper‐type oxides exhibit remarkable chemical stability in comparison to perovskite oxides. However, they display lower oxygen permeability. We present an approach to overcome this trade‐off by leveraging the anisotropic proper…
View article: Hydrogen-Tolerant La0.6Ca0.4Co0.2Fe0.8O3–d Oxygen Transport Membranes from Ultrasonic Spray Synthesis for Plasma-Assisted CO2 Conversion
Hydrogen-Tolerant La0.6Ca0.4Co0.2Fe0.8O3–d Oxygen Transport Membranes from Ultrasonic Spray Synthesis for Plasma-Assisted CO2 Conversion Open
La0.6Ca0.4Co1–xFexO3–d in its various compositions has proven to be an excellent CO2-resistant oxygen transport membrane that can be used in plasma-assisted CO2 conversion. With the goal of incorporating green hydrogen into the CO2 convers…
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other hand, the projectile passes through homogenous boron carbide/aluminum armor (top) relatively unchanged and thus is more lethal.
View article: Laser generation of CeAlO3 nanocrystals with perovskite structure
Laser generation of CeAlO3 nanocrystals with perovskite structure Open
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View article: Superior Thermoelectric Performance of Textured Ca<sub>3</sub>Co<sub>4−</sub><i><sub>x</sub></i>O<sub>9+</sub><i><sub>δ</sub></i> Ceramic Nanoribbons
Superior Thermoelectric Performance of Textured Ca<sub>3</sub>Co<sub>4−</sub><i><sub>x</sub></i>O<sub>9+</sub><i><sub>δ</sub></i> Ceramic Nanoribbons Open
Calcium cobaltite Ca 3 Co 4− x O 9+ δ (CCO) is a promising p ‐type thermoelectric (TE) material for high‐temperature applications in air. The grains of the material exhibit strong anisotropic properties, making texturing and nanostructurin…
View article: Recycling process development with integrated life cycle assessment – a case study on oxygen transport membrane material
Recycling process development with integrated life cycle assessment – a case study on oxygen transport membrane material Open
Integrated life cycle assessment and chemical process development was conducted. The recycling process delivers material with primary-like properties and reduced environmental impact.
View article: Stable Ce0.8Gd0.2O2-δ oxygen transport membrane reactor for hydrogen production
Stable Ce0.8Gd0.2O2-δ oxygen transport membrane reactor for hydrogen production Open
View article: Experimental application of a laser‐based manufacturing process to develop a free customizable, scalable thermoelectric generator demonstrated on a hot shaft
Experimental application of a laser‐based manufacturing process to develop a free customizable, scalable thermoelectric generator demonstrated on a hot shaft Open
Geometry, design, and processing in addition to the thermoelectric material properties have a significant influence on the economic efficiency and performance of thermoelectric generators (TEGs). While conventional BULK TEGs are elaborate …
View article: High-Entropy Perovskites Pr1−xSrx(Cr,Mn,Fe,Co,Ni)O3−δ (x = 0–0.5): Synthesis and Oxygen Permeation Properties
High-Entropy Perovskites Pr1−xSrx(Cr,Mn,Fe,Co,Ni)O3−δ (x = 0–0.5): Synthesis and Oxygen Permeation Properties Open
High-entropy perovskite oxides have already been studied in various fields owing to their high-entropy-induced properties. Partial substitution of an element by a lower valence element usually improves the oxygen permeability of perovskite…
View article: Electrospun Ca <sub>3</sub> Co <sub>4−</sub> <i> <sub>x</sub> </i> O <sub>9+</sub> <i> <sub>δ</sub> </i> nanofibers and nanoribbons: Microstructure and thermoelectric properties
Electrospun Ca <sub>3</sub> Co <sub>4−</sub> <i> <sub>x</sub> </i> O <sub>9+</sub> <i> <sub>δ</sub> </i> nanofibers and nanoribbons: Microstructure and thermoelectric properties Open
Oxide‐based ceramics offer promising thermoelectric (TE) materials for recycling high‐temperature waste heat, generated extensively from industrial sources. To further improve the functional performance of TE materials, their power factor …
View article: Sol–Gel-Process-Based Molten-Flux Synthesis of Plate-like La2NiO4+δ Particles
Sol–Gel-Process-Based Molten-Flux Synthesis of Plate-like La2NiO4+δ Particles Open
La2NiO4+δ particles with a plate-like morphology were prepared from a NaOH melt by molten-flux synthesis. For this purpose, the intermediates from a sol–gel process were used as reactants. Using powder X-ray diffraction, the sol–gel interm…
View article: Tuning the Thermoelectric Performance of CaMnO<sub>3</sub>-Based Ceramics by Controlled Exsolution and Microstructuring
Tuning the Thermoelectric Performance of CaMnO<sub>3</sub>-Based Ceramics by Controlled Exsolution and Microstructuring Open
The thermoelectric properties of CaMnO3−δ/CaMn2O4 composites were tuned via microstructuring and compositional adjustment. Single-phase rock-salt-structured CaO–MnO materials with Ca:Mn ratios larger than unity were produced in reducing at…
View article: Green Synthesis of Silver Nanoparticles Using Hypericum perforatum L. Aqueous Extract with the Evaluation of Its Antibacterial Activity against Clinical and Food Pathogens
Green Synthesis of Silver Nanoparticles Using Hypericum perforatum L. Aqueous Extract with the Evaluation of Its Antibacterial Activity against Clinical and Food Pathogens Open
The rapid development of nanotechnology and its applications in medicine has provided the perfect solution against a wide range of different microbes, especially antibiotic-resistant ones. In this study, a one-step approach was used in pre…