Thomas Graule
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View article: Solvothermal Synthesis of Medium‐Entropy Oxide Spheres for Thermocatalytic Conversion of CO <sub>2</sub> to Methanol
Solvothermal Synthesis of Medium‐Entropy Oxide Spheres for Thermocatalytic Conversion of CO <sub>2</sub> to Methanol Open
New chemical compositions and structures for medium‐ and high‐entropy oxides (HEOs) currently represent a promising new avenue in materials research for a wide range of applications including catalysis, energy storage, and ceramics. To spe…
View article: Time‐Resolved Oxidation State Changes Are Key to Elucidating the Bifunctionality of Perovskite Catalysts for Oxygen Evolution and Reduction
Time‐Resolved Oxidation State Changes Are Key to Elucidating the Bifunctionality of Perovskite Catalysts for Oxygen Evolution and Reduction Open
In a unified regenerative fuel cell (URFC) or reversible fuel cell, the oxygen bifunctional catalyst must switch reversibly between the oxygen reduction reaction (ORR), fuel cell mode, and the oxygen evolution reaction (OER), electrolyzer …
View article: MgAl2O4 spinel with transmittance approaching theoretical value at reduced sintering temperatures
MgAl2O4 spinel with transmittance approaching theoretical value at reduced sintering temperatures Open
Magnesium aluminate spinel is known to be a material with a good combination of mechanical properties, resistance against chemical attack and a high melting point, being thus a very promising material for application as a transparent mater…
View article: Delving into Fe-content effects on surface reconstruction of Ba<sub>0.50</sub>Sr<sub>0.50</sub>Co<sub>1−<i>x</i></sub>Fe<sub><i>x</i></sub>O<sub>3−<i>δ</i></sub> for the oxygen evolution reaction
Delving into Fe-content effects on surface reconstruction of Ba<sub>0.50</sub>Sr<sub>0.50</sub>Co<sub>1−<i>x</i></sub>Fe<sub><i>x</i></sub>O<sub>3−<i>δ</i></sub> for the oxygen evolution reaction Open
The Fe-content in Ba 0.50 Sr 0.50 Co 1− x Fe x O 3− δ directly influences the extent of surface reconstruction, and thus the oxygen evolution reaction (OER) performance in alkaline media, by controlling the stability of surface Co 2+ -atom…
View article: Hydrogen spillover drives room temperature sensing on spark plasma sintered BaTiO<sub>3</sub> with Pt electrodes
Hydrogen spillover drives room temperature sensing on spark plasma sintered BaTiO<sub>3</sub> with Pt electrodes Open
Change in BaTiO 3 grain boundary resistance due to H 2 dissociation on platinum and spillover and reaction of hydrogen with BaTiO 3 surface hydroxyl species. This forms adsorbed water that desorbs to generate oxygen vacancies.
View article: Designing bifunctional perovskite catalysts for the oxygen reduction and evolution reactions
Designing bifunctional perovskite catalysts for the oxygen reduction and evolution reactions Open
Design strategies for bifunctional catalysts are verified by investigating the catalysts’ activity and stability under reversible operation, as well as through operando investigation of the catalysts’ oxidation state.
View article: A Facile Two-Step Thermal Process for Producing a Dense, Phase-Pure, Cubic Ta-Doped Lithium Lanthanum Zirconium Oxide Electrolyte for Upscaling
A Facile Two-Step Thermal Process for Producing a Dense, Phase-Pure, Cubic Ta-Doped Lithium Lanthanum Zirconium Oxide Electrolyte for Upscaling Open
An inorganic solid electrolyte is the most favorable candidate for replacing flammable liquid electrolytes in lithium batteries. Lithium lanthanum zirconium oxide (LLZO) is considered a promising solid electrolyte due to its safe operating…
View article: Cobalt-free layered perovskites RBaCuFeO<sub>5+<i>δ</i></sub> (R = 4f lanthanide) as electrocatalysts for the oxygen evolution reaction
Cobalt-free layered perovskites RBaCuFeO<sub>5+<i>δ</i></sub> (R = 4f lanthanide) as electrocatalysts for the oxygen evolution reaction Open
O K-edge XAS measurements reveal a surface reconstruction in RBaCuFeO 5+ δ layered perovskites when δ > 0. Oxygen excess, together with some degree of A-site cation intermixing, appears to control the OER activity in these Co-free electroc…
View article: A Facile Two-Step Thermal Process for Producing Dense Phase Pure Cubic Ta-Doped Lithium Lanthanum Zirconium Oxide Electrolyte for Upscaling
A Facile Two-Step Thermal Process for Producing Dense Phase Pure Cubic Ta-Doped Lithium Lanthanum Zirconium Oxide Electrolyte for Upscaling Open
An inorganic solid electrolyte is the most favorable candidate for replacing flammable liquid electrolytes in lithium batteries. Lithium Lanthanum Zirconium Oxide (LLZO) is considered as a promising solid electrolyte due to its safe operat…
View article: Spray drying as a one-step production method of SiC-based granulates for direct reactive laser sintering of Reaction Bonded Silicon Carbide (RBSiC)
Spray drying as a one-step production method of SiC-based granulates for direct reactive laser sintering of Reaction Bonded Silicon Carbide (RBSiC) Open
This research is focused on the development and production of SiC-based granulates for reactive laser sintering. Ceramic slurries with different compositions of SiC, Si, C powders, and PVA binder were subjected to spray drying. Carbon sour…
View article: Stability assessment of alumina and SiC based refractories in a high temperature steam environment as potential thermal energy storage materials
Stability assessment of alumina and SiC based refractories in a high temperature steam environment as potential thermal energy storage materials Open
Solar energy can be utilized not only for electricity generation but also for synthetic fuel production, making it a versatile option in the transition to a low-carbon and sustainable energy system. However, to enable economically viable s…
View article: Operando tomographic microscopy during laser-based powder bed fusion of alumina
Operando tomographic microscopy during laser-based powder bed fusion of alumina Open
Laser-based Powder Bed Fusion (LPBF) of oxide ceramics enables fabrication of objects with complex three-dimensional shapes. However, mechanical properties of dense LPBF-manufactured ceramics are poor due to large amount of structural defe…
View article: The Role of Phosphate Functionalization on the Oxygen Evolution Reaction Activity of Cobalt‐Based Oxides at Different pH Values
The Role of Phosphate Functionalization on the Oxygen Evolution Reaction Activity of Cobalt‐Based Oxides at Different pH Values Open
Cobalt‐based oxides have attracted attention as active electrocatalysts for the oxygen evolution reaction (OER) in alkaline electrolytes. However, highly OER active catalysts at near‐neutral pHs are also desired for practical applications.…
View article: Influence of carbon on the dynamic changes in <scp>C</scp>o oxidation state of Ba0.<scp>5Sr0</scp>.<scp>5Co0</scp>.<scp>8Fe0</scp>.<scp>2O3</scp>‐δ perovskite catalyst during the oxygen reduction and evolution reactions
Influence of carbon on the dynamic changes in <span>C</span>o oxidation state of Ba0.<span>5Sr0</span>.<span>5Co0</span>.<span>8Fe0</span>.<span>2O3</span>‐δ perovskite catalyst during the oxygen reduction and evolution reactions Open
Carbon is often used as a conductive additive in catalyst layers to increase conductivity and catalytic activity. However, the effect of carbon addition to perovskites on the oxygen reduction (ORR) and oxygen evolution (OER) reactions is c…
View article: DLP 3D printing of high strength semi-translucent zirconia ceramics with relatively low-loaded UV-curable formulations
DLP 3D printing of high strength semi-translucent zirconia ceramics with relatively low-loaded UV-curable formulations Open
DLP 3D printing is one of the additive manufacturing techniques, which allows the fabrication of ceramic parts with a complex shape, precisely controlled internal architecture and fine surface finishing. The method is based on the layer-by…
View article: Joining of alumina ceramics with Ti and Zr interlayers by spark plasma sintering
Joining of alumina ceramics with Ti and Zr interlayers by spark plasma sintering Open
In this study, alumina ceramics were joined by spark plasma sintering technology using zirconium and titanium metals as interlayers. Bonding with Zr was achieved at 800 and 900 °C with an applied force of 4.2 kN, and then at 900 °C with a …
View article: Electrospinning of ZrO2 fibers without sol-gel methods: Effect of inorganic Zr-source on electrospinning properties and phase composition
Electrospinning of ZrO2 fibers without sol-gel methods: Effect of inorganic Zr-source on electrospinning properties and phase composition Open
The aim of this study was the electrospinning of zirconia nanofibers without sol-gel precursors. Low-cost Zr-oxide and Zr-carbonate inorganic materials, with high molecular Zr-content compared to sol-gel methods, were used for precursor fo…
View article: Debinding of additively manufactured parts from spinel powders with particle sizes below 200 nm
Debinding of additively manufactured parts from spinel powders with particle sizes below 200 nm Open
The widespread application of additive manufacturing in ceramics is still hindered by recurrent cracking issues during debinding. To date, the various strategies that have been attempted to reduce this problem often fail upon particle size…
View article: Low Temperature Transient Liquid Phase Bonding of Alumina Ceramics with the Bi2O3-ZnO Interlayer
Low Temperature Transient Liquid Phase Bonding of Alumina Ceramics with the Bi2O3-ZnO Interlayer Open
Alumina ceramics were joined by a transient liquid phase (TLP) bonding method at relatively lower temperatures, using mixed powders of Bi2O3 and ZnO with different weight ratios as interlayers between the ceramic components. Bonding was ac…
View article: Liquid metal infiltration of silicon based alloys into porous carbonaceous materials Part-III: Experimental verification of conversion products and infiltration depth by infiltration of Si-Zr alloy into mixed SiC/graphite preforms
Liquid metal infiltration of silicon based alloys into porous carbonaceous materials Part-III: Experimental verification of conversion products and infiltration depth by infiltration of Si-Zr alloy into mixed SiC/graphite preforms Open
Porous carbonaceous preforms, made from graphite and silicon carbide (SiC) powders, with varying graphite powder mass fractions and particle sizes, were infiltrated at 1500 degrees C and 1700 degrees C by Si-8 at. pct Zr alloy to produce d…
View article: Photonic Sintering of Oxide Ceramic Films: Effect of Colored FexOy Nanoparticle Pigments
Photonic Sintering of Oxide Ceramic Films: Effect of Colored FexOy Nanoparticle Pigments Open
Alumina and zirconia thin films modified with colored nano-FexOy pigments were sintered by the flash-lamp-annealing method. We selected a nano α-Al2O3 and micron α-Al2O3 bimodal mixture as the base precursor material, and we doped it with …
View article: Operando tomographic microscopy during laser-based powder bed fusion
Operando tomographic microscopy during laser-based powder bed fusion Open
Laser-based Powder Bed Fusion (LPBF) of oxide ceramics enables fabrication of objects with complex three-dimensional shapes, which are impossible to achieve using conventional manufacturing routes. However, mechanical properties of dense L…
View article: Aerosol-Assisted Deposition for TiO2 Immobilization on Photocatalytic Fibrous Filters for VOC Degradation
Aerosol-Assisted Deposition for TiO2 Immobilization on Photocatalytic Fibrous Filters for VOC Degradation Open
Atomization and spraying are well-established methods for the production of submicrometer- and micrometer- sized powders. In addition, they could be of interest to the immobilization of photocatalytic nanoparticles onto supports because th…
View article: Removal of MS2 and fr Bacteriophages Using MgAl2O4-Modified, Al2O3-Stabilized Porous Ceramic Granules for Drinking Water Treatment
Removal of MS2 and fr Bacteriophages Using MgAl2O4-Modified, Al2O3-Stabilized Porous Ceramic Granules for Drinking Water Treatment Open
Point-of-use ceramic filters are one of the strategies to address problems associated with waterborne diseases to remove harmful microorganisms in water sources prior to its consumption. In this study, development of adsorption-based ceram…
View article: Tuning of the microstructural and electrical properties of undoped BaTiO3 by spark plasma sintering
Tuning of the microstructural and electrical properties of undoped BaTiO3 by spark plasma sintering Open
The distribution of oxygen vacancies in BaTiO3 specimens can greatly affect material electrical properties. Spark plasma sintering followed by annealing in controlled pO2 atmospheres offers the potential to control the oxygen vacancy distr…