A5016464478- Advancements in Solid Oxide Fuel Cells
- Fuel Cells and Related Materials
- Electronic and Structural Properties of Oxides
- Catalytic Processes in Materials Science
- Magnetic and transport properties of perovskites and related materials
- Electrocatalysts for Energy Conversion
- Chemical Looping and Thermochemical Processes
- Catalysis and Oxidation Reactions
- Nuclear Materials and Properties
- High-Temperature Coating Behaviors
- Advanced ceramic materials synthesis
- Hybrid Renewable Energy Systems
- Advanced materials and composites
- Semiconductor materials and devices
- Vehicle emissions and performance
- Molten salt chemistry and electrochemical processes
- Catalysts for Methane Reforming
- Ammonia Synthesis and Nitrogen Reduction
- Metallurgical Processes and Thermodynamics
- Magnetic properties of thin films
- Theoretical and Computational Physics
- Geomagnetism and Paleomagnetism Studies
- Characterization and Applications of Magnetic Nanoparticles
- Metal and Thin Film Mechanics
- Gas Sensing Nanomaterials and Sensors
Technical University of Denmark
2015-2024
Gdańsk University of Technology
2017
National Research Centre for the Working Environment
2017
IRD Fuel Cells (Denmark)
2006-2012
Nordic Laboratory for Luminescence Dating
1998-2010
Fuel Cells and Hydrogen
2007
Centre for Sustainable Energy
1995-2006
Abstract Solid oxide fuel cells (SOFCs) are efficient and flexible electrochemical energy conversion devices that can power the future green society with regards to homes, cars, even down portable electronics. They do have potential become low cost, since no noble metals used. Their broad commercialization, however, is hampered by high operating temperatures of 700–900 ° C. Lowering temperature SOFCs challenging as both charge transport in solid electrolyte oxygen exchange reactions...
Abstract Severe degradation of Ni‐YSZ (yttria stabilized zirconia) electrodes solid oxide cells (SOCs) due to Ni migration is well known, but the literature contains apparent contradictions. The mechanisms are still under debate. Fine structured composite often degrade at operation temperature (700–950°C), because particles lose electrical contact with each other as larger Ni‐particles grow on expense smaller ones. Another type migration, which may be very damaging, relocation in most active...
This paper focuses on developing a fast-solving open-source model for dynamic power-to-X plant techno-economic analysis and analysing the method bias that occurs when using other state-of-the-art cost calculation methods. The is least-cost optimisation of investments operation-costs, taking as input data, varying power profiles hourly grid prices. fuel analysed ammonia synthesised from electrolytic hydrogen produced with electricity photovoltaics, wind turbines or grid. Various weather...
This study investigates utilizing hydrogen produced via water electrolysis to produce green ammonia. Routes are benchmarked based on employing either alkaline (AEC) or solid oxide (SOEC). Both existing and possible improvements modeled for the AEC SOEC technologies coupled with Haber-Bosch process synthesize The cost of ammonia is estimated considering electrolyzers both today future projections compared that "fossil" synthesized from natural gas. Threshold CO2 taxes required achieve parity...
Anode-supported thin electrolyte cells are studied by electrochemical impedance spectroscopy (EIS). The aim is to describe how the losses of this type distributed at low current density (around open-circuit voltage) as a function temperature. An equivalent circuit consisting an inductance, serial resistance , and five arcs polarization suggested. This based on previous studies single electrodes in three-electrode two-electrode symmetric cell setups. components have been assigned electrode...
The spin-wave spectrum of Heisenberg spin clusters various structures (bcc, fcc, and disordered) ranging in size between 9 749 spins is calculated by a self-consistent diagonalization the equation motion ${\mathit{S}}^{+}$ real space. strongly modified relative to bulk, consequent neutron-scattering cross section exhibits discretely spaced wave-vector-broadened eigenstates. implications finite on thermodynamic properties, like temperature dependence magnetization critical temperature, are...
Samples of interacting nanosized maghemite particles have been studied by M\"ossbauer spectroscopy and magnetization measurements. The apparent blocking temperatures obtained from zero-field-cooled curves are nearly identical, but the values measurements decay remanence much lower. These results not in accordance with N\'eel model for superparamagnetic relaxation, can be explained formation an ordered spin-glass-like state at low temperatures. At a critical temperature transition to takes...
The degradation behavior of anode supported solid oxide fuel cells (SOFCs) was investigated as a function operating temperature and current density. Degradation rates were defined shown to be mainly dependent on the cell polarization. combination detailed evaluation electrochemical properties by impedance spectroscopy, in particular, post-test microscopy revealed that cathode dominant contribution at higher densities lower temperatures. found contribute more Generally, obtained temperatures,...
A range of solid electrolyte cell geometries has been evaluated in terms their suitability for measurements the working electrode polarization resistance a three‐electrode configuration. The potential and current density distributions cells are calculated numerically. If at is not uniform, standard procedure evaluating from experimental data inadequate may lead to erroneous results. Simulations presented with thin electrolytes pellet‐based large thickness.
Many processes contribute to the overall impedance of an electrochemical cell, and these may be difficult separate in spectrum. Here, we present investigation a solid oxide fuel cell based on differences spectra due change operating parameters result as derivative with respect . The method is used anode cathode contributions identify various types processes.
Ni/yttria stabilized zirconia (YSZ) supported solid oxide electrolysis cells (SOECs) were exposed to long-term galvanostatic tests, under different testing conditions (temperature, gas composition, current density etc.) with an emphasis on high (above −1 A/cm2). Detailed post-mortem characterizations carried out investigate microstructural changes after focusing the Ni/YSZ electrode. Formation of ZrO2 nano-particles Ni surfaces was observed in or −1.5 A/cm2 at 800 850°C, but not those tested...
Abstract This paper deals with degradation mechanisms of Ni–YSZ electrodes for solid oxide cells, mainly electrolysis cells (SOECs), but also to some extent fuel (SOFCs). Analysis literature data reveals that several apparently different and even in one case contradicting phenomena are a consequence interplay between loss contact the (and Ni–Ni particles) active fine‐structured composite electrode layer migration Ni via weakly oxidized hydroxide species. A hypothesis unravels apparent...
Despite various advantages of high-temperature solid oxide electrolysis cells (SOECs) over their low-temperature competitors, the insufficient long-term durability has prevented commercialization SOECs. Here, we address this challenge by employing two nanoengineered electrodes. The O2 electrode consists a La0.6Sr0.4CoO3-δ (LSC) and Gd,Pr-co-doped CeO2 (CGPO) nanocomposite coating deposited on Gd-doped (CGO) scaffold, H2 comprises Ni/yttria stabilized zirconia (YSZ) modified with nanogranular...
The transportation sector is undergoing a technology shift from internal combustion engines to electric motors powered by secondary Li-based batteries. However, the limited range and long charging times of Li-ion batteries still hinder widespread adoption. This aspect particularly true in case heavy freight long-range transportation, where solid oxide fuel cells (SOFCs) offer an attractive alternative as they can provide high-efficiency flexible choices. SOFC mainly used for stationary...
The degree of alignment the magnetic moments Fe3+ ions in ultrafine maghemite particles has been studied samples with induced texture. textured were prepared by freezing ferrofluids, containing 7.5 nm particles, a field. Mössbauer spectroscopy studies large fields demonstrate that lack full is not an effect anisotropy, as suggested recently, but rather due to canting individual spins.