A5040640271- Advancements in Solid Oxide Fuel Cells
- Magnetic and transport properties of perovskites and related materials
- Electronic and Structural Properties of Oxides
- Thermal Expansion and Ionic Conductivity
- Nuclear materials and radiation effects
- Catalysis and Oxidation Reactions
- Advanced Condensed Matter Physics
- Catalytic Processes in Materials Science
- Ferroelectric and Piezoelectric Materials
- Microwave Dielectric Ceramics Synthesis
- Electrocatalysts for Energy Conversion
- Gas Sensing Nanomaterials and Sensors
- Thermochemical Biomass Conversion Processes
- Glass properties and applications
- Luminescence Properties of Advanced Materials
- Fuel Cells and Related Materials
- Advanced Thermoelectric Materials and Devices
- Advanced ceramic materials synthesis
- Physics of Superconductivity and Magnetism
- Molten salt chemistry and electrochemical processes
- Chemical Looping and Thermochemical Processes
- Magnetic Properties and Synthesis of Ferrites
- Layered Double Hydroxides Synthesis and Applications
- Catalysis and Hydrodesulfurization Studies
- Transition Metal Oxide Nanomaterials
University of Aveiro
2015-2024
Swiss Federal Laboratories for Materials Science and Technology
2013
The University of Sydney
2009-2010
Flemish Institute for Technological Research
2008
Institute of Solid State Chemistry
2008
Max Planck Institute of Colloids and Interfaces
2005
Belarusian State University
1998-2004
The review represents a comprehensive and critical analysis of the state-of-the-art knowledge on layered Ruddlesden–Popper nickelates as promising electrodes for protonic ceramic electrochemical cells.
Donor-substituted strontium titanate ceramics demonstrate one of the most promising performances among n-type oxide thermoelectrics. Here we report a marked improvement thermoelectric properties in rare-earth substituted titanates Sr0.9R0.1TiO3±δ (R = La, Ce, Pr, Nd, Sm, Gd, Dy, Y) to achieve maximal ZT values as high 0.42 at 1190 K < T 1225 K, prepared via conventional solid state route followed by sintering under strongly reducing conditions (10%H2–90%N2, 1773 K). As result complex defect...
(CGO) and (LSM) possess similar thermal expansion coefficients were thus combined in dual‐phase membranes for oxygen separation. Studies of permeation through CGO‐LSM composite ceramics, containing volume fractions the phases, showed that transfer is limited by bulk ionic conductivity. The conduction composites depends strongly on processing conditions, decreasing with interdiffusion phase components. Blocking assumed to be due formation layers low conductivity at CGO grain boundaries,...
The equilibrium chemical strains induced by the oxygen hyperstoichiometry variations in mixed-conducting La2Ni1-xMxO4+δ (M = Fe, Co, Cu; x 0−0.2) with K2NiF4-type structure, were studied controlled-atmosphere dilatometry at 923−1223 K partial pressure range 5 × 10-4 to 0.7 atm. In combination content measured coulometric titration and thermogravimetry, results reveal a very low expansivity, favorable for high-temperature electrochemical applications. Under oxidizing conditions, isothermal...
Increasing the difference of Ln3+ and A2+ cation radii in perovskite-type Ln0.5A0.5FeO3−δ (Ln = La, Pr, Nd, Sm; A Sr, Ba) results higher oxygen deficiency lower oxygen-ionic p-type electronic conductivities, determined using permeation total conductivity measurements at 973−1223 K. The relationships between anion transport A-site size mismatch remain essentially similar air under reducing conditions when most iron cations become trivalent, thus confirming critical influence oxygen-vacancy...
Donor-substituted strontium titanate is known as one of the best highly performing n-type oxide thermoelectrics. In present work, structural, microstructural, and thermoelectric properties Sr1–xPrxTiO3±δ, Sr1–1.5xPrxTiO3±δ, Sr1–yTi0.8Nb0.2O3±δ (x = 0.05–0.30, y 0–0.10) perovskite-type titanates were assessed to identify impact nominal A-site deficiency on performance. A large increase in power factor was observed for nonstoichiometric materials at high donor-substitution level, provided by...
Inspired by recent research results that have demonstrated appealing thermoelectric performance of A-site cation-deficient titanates, this work focuses on detailed analysis the changes in promoted altering defect chemistry mechanisms. The series cation-stoichiometric SrTi1–xTaxO3±δ and deficient Sr1-x/2Ti1–xTaxO3-δ compositions (0.05 ≤ x 0.30) with cubic perovskite-like structure were selected to demonstrate engineering approaches, which result promising electric thermal properties. High...
Stabilization of the cubic perovskite phase was demonstrated in oxide system at x ⩾ 0.03. Oxygen permeability solid solutions independent chromium content = 0.01 − 0.05. It found that reducing ceramic grain size dimensions resulted decreasing thermal expansion electrical conductivity, and oxygen membranes. transport through ceramics shown to be limited by both bulk ionic conductivity exchange currents. The limiting effect membrane permeate‐side surface on permeation higher comparison with...
The oxygen ionic conductivity of apatite-type and increases with increasing content. ion transference numbers, determined by faradaic efficiency measurements at 973-1223 K in air, are close to unity for vary the range 0.96-0.99 other compositions. Doping iron results an fraction, which was evaluated Mössbauer spectroscopy correlates partial p-type electronic conductivities, whereas La-stoichiometric apatites stabilize state. Among studied materials, highest transport is observed where...
The antiferromagnetic-ferromagnetic phase transition in $\mathrm{Y}\mathrm{Ba}{\mathrm{Co}}_{2}{\mathrm{O}}_{5.50}$ and $\mathrm{Y}\mathrm{Ba}{\mathrm{Co}}_{2}{\mathrm{O}}_{5.44}$ cobaltites with different types of oxygen-ion ordering the $[\mathrm{Y}{\mathrm{O}}_{0.5∕0.44}]$ layers has been studied by neutron powder diffraction combination group-theoretical analysis. As a result, crystal magnetic structures above below transformation temperature ${T}_{i}$ were determined successfully...
In order to identify the effects of Pr additions on thermoelectric properties strontium titanate, crystal structure, electrical and thermal conductivity, Seebeck coefficient Sr1−xPrxTiO3 (x = 0.02–0.30) materials were studied at 400 &lt; T 1180 K under highly reducing atmosphere. The mechanism electronic transport was found be similar up 10% praseodymium content, where generation charge carriers upon substitution resulted in significant increase moderate decrease coefficient, general...