Analysis of solid oxide fuel and electrolysis cells operated in a real-system environment: State-of-the-health diagnostic, failure modes, degradation mitigation and performance regeneration

Effects of Ceria on the Oxygen Reduction Activity and Thermal Cycling Stability of BaCo0.4Fe0.4Zr0.1Y0.1O3−δ Cathode for Solid Oxide Fuel Cells

“…However, one critical issue of this material related to the real device/application is its high thermal expansion coefficient (TEC), over the typical electrolytes. , For the general operational condition, constant current density or voltage at the fixed temperature, such an thermal incompatibility issue will not be revealed. However, as the fuel cell system may undergo unavoided temperature fluctuation or cell start-up or unplanned shutdown due to insufficient fuel/oxidant supply or abnormal/aggressive conditions, transient/variable loads, big TEC difference/mismatching may bring an unpredictable behavior change in cell performance or even lead to cell failure. , To the best of our knowledge, there is only one work reported in the literature that concerns the thermal cycling effect on the performance of SOFCs using BCFZY cathode, where manual turn-off and opening of the testing furnace were adopted to control the temperature with a maximum temperature ramp of 18 °C min –1 at the temperature range of 300–500 °C. However, an accelerated stress test is still needed to gain more insight into SOFC durability upon thermal stress, especially at elevated temperatures (600–800 °C).…”

Water Electrolysis toward Elevated Temperature: Advances, Challenges and Frontiers

“…In addition to the microstructure changes, significant performance degradation of the Ni/YSZ electrode is also caused by the deposition of the impurities, such as silicon from the raw materials and the glass sealing substances . Based on the microstructure analysis, an increase of the polarization resistance for 225% during the 1600-h operation at 850 °C was caused by the silica deposited on the Ni/YSZ electrode, and especially on the interface between the electrode and electrolyte, which blocked considerable electrochemical active sites and was convinced by other research .…”

“…529 In this regard, the effectiveness of infiltrating GDC nanoparticles into the Ni/YSZ cathode was probed by the absence of obvious degradation at 100 mA•cm −2 and 800 °C, whereas a considerable voltage increase from 1.3 to 1.8 V over 200 h was illustrated by the a SOEC with a bare Ni/YSZ electrode under the identical conditions. 411 In addition to the microstructure changes, significant performance degradation of the Ni/YSZ electrode is also caused by the deposition of the impurities, 532 such as silicon from the raw materials and the glass sealing substances. 539 Based on the microstructure analysis, an increase of the polarization resistance for 225% during the 1600-h operation at 850 °C was caused by the silica deposited on the Ni/YSZ electrode, and especially on the interface between the electrode and electrolyte, which blocked considerable electrochemical active sites 539 and was convinced by other research.…”

Fast online diagnosis for solid oxide fuel cells: Optimisation of total harmonic distortion tool for real-system application and reactants starvation identification

“…To compute the DRT calculation for the purpose of this study, the freely available MATLAB ® toolbox DRTtools [48] was used. More detailed description of the DRT principles as well as summary of specific frequencies from the literature related to the SOFC processes can be found in [34].…”

“…A number of investigations carried out under stationary operating conditions enabled to link specific frequency ranges with different processes that occur while operating the cells in SOFC mode. In [34], a very detailed summary of peaks observed in literature and their correlation to specific process mechanisms is reported, which can be used as a guideline while employing DRT analysis to analyse SOFC performance.…”