A5101811391- Advancements in Solid Oxide Fuel Cells
- Electronic and Structural Properties of Oxides
- Gas Sensing Nanomaterials and Sensors
- Fuel Cells and Related Materials
- Analytical Chemistry and Sensors
- Force Microscopy Techniques and Applications
- Semiconductor materials and devices
- Electrocatalysts for Energy Conversion
- Magnetic and transport properties of perovskites and related materials
- Metal Extraction and Bioleaching
- Catalytic Processes in Materials Science
- Electrochemical Analysis and Applications
- Transition Metal Oxide Nanomaterials
- Chemical Looping and Thermochemical Processes
- Conducting polymers and applications
- Surface and Thin Film Phenomena
- Research Data Management Practices
- Quantum Dots Synthesis And Properties
- Catalysis and Oxidation Reactions
- Perovskite Materials and Applications
- Nuclear materials and radiation effects
- Molten salt chemistry and electrochemical processes
- Enhanced Oil Recovery Techniques
- Advanced Materials Characterization Techniques
- Ferroelectric and Piezoelectric Materials
Technical University of Denmark
2011-2021
Nordic Laboratory for Luminescence Dating
2003-2008
IRD Fuel Cells (Denmark)
2007
Division of Materials Research
2004
Centre for Sustainable Energy
2000
Abstract This review gives first a brief view of the potential availability sustainable energy. It is clear that over 100 times more solar photovoltaic energy than necessary readily accessible and practically available wind alone may deliver sufficient supply to world. Due intermittency these sources, effective inexpensive energy-conversion storage technology needed. Motivation for possible electrolysis application reversible solid-oxide cells (RSOCs), including comparison...
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...
Abstract Open access to research data is increasingly important for accelerating research. Grant authorities therefore request detailed plans how managed in the projects they finance. We have recently developed such a plan EU−H2020 BIG‐MAP project—a cross‐disciplinary project targeting disruptive battery‐material discoveries. Essential reaching goal extensive sharing of across scales, disciplines and stakeholders, not limited European BATTERY 2030+ initiative but within entire battery...
The electrochemical properties of the interface between Ni and yttria-stabilized zirconia (YSZ) in electrode have been investigated order to obtain knowledge on effect segregation impurities electrode-electrolyte performance. Even for a relatively pure nickel electrode, film was found at contact YSZ surface YSZ. Impurity ridges were also three-phase boundary. Impurities these locations all potential impeding processes reactions interface. electrodes showed lower resistance compared most...
Abstract The surface of an as‐polished and as‐sintered yttria‐stabilised zirconia pellet was analysed with XPS TOF‐SIMS (depth profiling imaging) in order to study the distribution impurities. polished sample slightly contaminated Na, K, Mg Ca. sintered showed a thin film segregated species, especially Si Al. Below film, it found that grain boundaries were filled chemical compositions surfaces are very different state should be considered when performing electrochemical measurements....
Long-term strong cathodic polarization experiments of down to –2.4 V vs. E°(O2) the Ni-YSZ interface were performed at 900°C in 97% H2/3% H2O on model electrodes. The underwent extensive changes and a large affected volume with complex microstructure phase distribution resulted. Impedance spectroscopy shows initial decrease but later increase series resistance during 140–160 h polarization, significant inductive behavior. An intermetallic Ni-Zr that formed was preserved when kept cooling,...
In electrochemical devices such as fuel cells or batteries the microstructure is a determining factor for performance of device. To be able to optimize it important quantitatively measure key structural parameters, that systematic studies can made. We present several general methods quantitative characterization network structures without prior assumptions shape application. The performed by extracting distributions values rather than single value descriptions, thus allowing more detailed...
The problems of understanding the electrode reaction kinetics and in particular degradation destroying performance, is briefly described. This followed by an analysis information that needed which knowledge may be acquired available operando situ techniques. latter illustrated some examples. Further, it discussed how research improved refining combining methods. Finally, possible strategies are discussed.
To locally access electrochemical active surfaces and interfaces in operando at the sub-micron scale high temperatures a reactive gas atmosphere is of great importance to understand basic mechanisms new functional materials, for instance, energy technologies, such as solid oxide fuel cells electrolyzer cells. Here, we report on advanced improvements our original controlled temperature scanning probe microscope, CAHT-SPM. The microscope can employ broad range techniques including tapping...
Investigations of degradation mechanisms solid oxide fuel cells are crucial for achieving a widespread commercialization the technology. In this work, electrochemical impedance spectroscopy (EIS) was applied studying aging effect on LSM-YSZ cathodes exposed to humidified air at 900°C up 3000 h. EIS spectra were fitted by transmission line model estimating relevant parameters associated with LSM/YSZ charge transfer reaction and ion conduction through YSZ network. For reference non-aged...
Lanthanum strontium manganite microelectrodes with the nominal composition of (La0.75Sr0.25)0.95MnO3 and a thickness ca 500 nm was electrochemically characterized in situ at temperatures from 660 to 850°C using controlled atmosphere high temperature scanning probe microscope. Impedance spectroscopy cyclic voltammetry were performed on electrodes diameters 20–100 μm oxygen, air nitrogen both open circuit voltage anodic cathodic polarization. In conductance mapping, ex surface analysis by...
The controlled atmosphere high temperature scanning probe microscope was designed to study the electrical properties of surfaces at elevated temperatures by using as an electrode. capability a simultaneous acquisition topographical and data for same surface area is demonstrated on several samples.
Lanthanum strontium manganate (LSM) micro-electrodes with the nominal composition of (La 0.75 Sr 0.25 ) 0.95 MnO 3 were deposited on yttria stabilized zirconia (YSZ). The diameter varied from 20 – 100 μm and thickness was kept constant at ca. 0.5 μm. Electrochemical characterization carried out in situ temperatures 660 to 860 °C using controlled atmosphere high temperature scanning probe microscope (CAHT-SPM) set-up for measurements impedance spectroscopy potential sweep. oxygen partial...