| People | Locations | Statistics |
|---|---|---|
| Naji, M. |
| |
| Motta, Antonella |
| |
| Aletan, Dirar |
| |
| Mohamed, Tarek |
| |
| Ertürk, Emre |
| |
| Taccardi, Nicola |
| |
| Kononenko, Denys |
| |
| Petrov, R. H. | Madrid |
|
| Alshaaer, Mazen | Brussels |
|
| Bih, L. |
| |
| Casati, R. |
| |
| Muller, Hermance |
| |
| Kočí, Jan | Prague |
|
| Šuljagić, Marija |
| |
| Kalteremidou, Kalliopi-Artemi | Brussels |
|
| Azam, Siraj |
| |
| Ospanova, Alyiya |
| |
| Blanpain, Bart |
| |
| Ali, M. A. |
| |
| Popa, V. |
| |
| Rančić, M. |
| |
| Ollier, Nadège |
| |
| Azevedo, Nuno Monteiro |
| |
| Landes, Michael |
| |
| Rignanese, Gian-Marco |
|
Hauch, Anne
Haldor Topsoe (Denmark)
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (15/15 displayed)
- 2023(Invited) A Sustainable Future Fueled By Science: Recent Advances in Power-to-X Activities at Topsoe
- 2021Ni migration in solid oxide cell electrodes:Review and revised hypothesiscitations
- 2021Ni migration in solid oxide cell electrodes: Review and revised hypothesiscitations
- 2021Ni migration in solid oxide cell electrodes: Review and revised hypothesiscitations
- 2020Review of Ni migration in SOC electrodes
- 2020Review of Ni migration in SOC electrodes
- 2019Comprehensive Hypotheses for Degradation Mechanisms in Ni-Stabilized Zirconia Electrodescitations
- 2019Comprehensive Hypotheses for Degradation Mechanisms in Ni-Stabilized Zirconia Electrodescitations
- 2018Diffusion rates of reactants and components in solid oxide cells
- 2016New Hypothesis for SOFC Ceramic Oxygen Electrode Mechanismscitations
- 2012Durable and Robust Solid Oxide Fuel Cells
- 2010Ni/YSZ electrode degradation studied by impedance spectroscopy: Effects of gas cleaning and current densitycitations
- 2008Solid Oxide Electrolysis Cells: Microstructure and Degradation of the Ni/Yttria-Stabilized Zirconia Electrodecitations
- 2008Solid Oxide Electrolysis Cells
- 2008Nanoscale chemical analysis and imaging of solid oxide cellscitations
Places of action
| Organizations | Location | People |
|---|
thesis
Solid Oxide Electrolysis Cells
Abstract
In this work H<sub>2</sub> electrode supported solid oxide cells (SOC) produced at Risø National Laboratory, DTU, have been used for steam electrolysis. Electrolysis tests have been performed at temperatures from 650°C to 950°C, p(H2O)/p(H2) from 0.99/0.01 to 0.30/0.70 and current densities from -0.25 A/cm<sup>2</sup> to -2 A/cm<sup>2</sup>. The solid oxide electrolysis cells (SOEC) have been characterised by iV curves and electrochemical impedance spectroscopy (EIS) at start and end of tests and by EIS under current load during electrolysis testing. The tested SOCs have shown the best initial electrolysis performance reported in literature to date. Area specific resistances of 0.26 Ωcm2 at 850°C and 0.17 Ωcm2 at 950°C were obtained from electrolysis iV curves. The general trend for the SOEC tests was: 1) a short-term passivation in first few hundred hours, 2) then an activation and 3) a subsequent and underlying long-term degradation. The transient phenomenon (passivation/activation) was shown to be a set-up dependent artefact caused by the albite glass sealing with a p(Si(OH)4) of ∼1⋅10-7 atm, leading to silica contamination of the triple-phase boundaries (TPBs) of the electrode. The long-term degradation for the SOECs was more pronounced than for fuel cell testing of similar cells. Long-term degradation of 2%/1000 h was obtained at 850°C, p(H<sub>2</sub>O)/p(H<sub>2</sub>) = 0.5/0.5 and -0.5 A/cm2, whereas the degradation rate increased to 6%/1000h at 950°C, p(H2O)/p(H2) = 0.9/0.1 and -1.0 A/cm<sup>2</sup>. Both the short-term passivation and the long-term degradation appear mainly to be related to processes in the H<sub>2</sub> electrode. Scanning electron microscopy micrographs show that only limited changes occur in the Ni particle size distribution and these are not the main degradation mechanism for the SOECs. Micro and nano analysis using energy dispersive spectroscopy in combination with transmission electron microscopy (TEM) and scanning TEM reveals that glassy phase impurities have accumulated at the TPBs as a result of testing of the SOECs. The impurities are typically in the size of 50-500 nm. The impurities are silicates, alumina silicates and in some cases sodium alumina silicates. It is believed that the degradation of the SOECs relates strongly to these impurity phases.