Effect of anodic current density on the spreading of infiltrated nickel nanoparticles in nickel-yttria stabilized zirconia cermet anodes

This study is supported through the United States of America Department of Energy National Energy Technology Laboratory (award number DE-FE0026096). The authors would also like to acknowledge the contributions of Dr. Alexey Nikiforov, Anlee Krupp, Dr. Ruofan Wang, and Zhihao Sun. (DE-FE0026096 - United States of America Department of Energy National Energy Technology Laboratory)https://www.sciencedirect.com/science/article/pii/S037877531831231XAccepted manuscrip

Co-infiltration of nickel and mixed conducting Gd0.1Ce0.9O2−δ and La0.6Sr0.3Ni0.15Cr0.85O3−δ phases in Ni-YSZ anodes for improved stability and performance

Accepted manuscrip

Experimental review of the performances of protective coatings for interconnects in solid oxide fuel cells

Ferritic stainless steel interconnects are used in solid oxide fuel cells; however, coatings are required to improve their performance. Although several types of coatings have been proposed, they have been scarcely investigated under similar conditions. This study compares the characteristics of uncoated Crofer 22 APU and eight different coatings on Crofer 22 APU for up to 3000\ua0h at 800\ua0\ub0C. The coatings were deposited at various research laboratories around the world, and the experiments were performed at Chalmers University of Technology, Sweden. Cross-sections of the samples were analysed using scanning electron microscopy and energy-dispersive x-ray spectroscopy. The (Co,Mn)-based coated steels showed more than 50-fold lower chromium evaporation and at least 3 times thinner Cr2O3 scale thickness compared to uncoated steel. The coated steel samples showed lower area-specific resistance (ASR) values than the uncoated steel after 3000\ua0h of exposure, irrespective of the coating thickness, composition and deposition method

Chromium Poisoning Effects on Performance of (La,Sr)MnO 3

Chromium (Cr) vapor species from chromia-forming alloy interconnects are known to cause cathode performance degradation in solid oxide fuel cells (SOFCs). To understand the impact of Cr-poisoning on cathode performance, it is important to determine its effects on different cathode polarization losses. In this study, anode-supported SOFCs, with a (La,Sr)MnO3 (LSM) + yttria-stabilized zirconia (YSZ) cathode active layer and a LSM cathode current collector layer were fabricated. At 800°C, cells were electrochemically tested in direct contact with Crofer22H meshes, under different cathode atmospheres (dry air or humidified air) and current conditions (open-circuit or galvanostatic). Significant performance degradation was observed when cell was tested under galvanostatic condition (0.5 A/cm2), which was not the case under open-circuit condition. Humidity was found to accelerate the performance degradation. By curve-fitting the experimentally measured current-voltage traces to a polarization model, the effects of Cr-poisoning on different cathodic polarization losses were estimated. It is found that, under normal operating conditions, increase of activation polarization dominates the cathode performance degradation. Microstructures of the cathodes were characterized and Cr-containing deposits were identified. Higher concentrations of Cr-containing deposits were found at the cathode/electrolyte interface and the amounts directly correlated with the cell performance degradations.http://jes.ecsdl.org/content/164/7/F740.fullPublished versio

Sensitization of the 1.54μm Er emission in Amorphous Silicon Nitride Films

We report on the fabrication, structural and optical properties of Er doped amorphous silicon nitride. The effect of excess Si on the sensitization of the 1.54 mum Er emission will be discussed

Step-index Si-Ge-core silica-cladded optical fibers

Si-Ge alloy-core silica-cladded fibers were drawn at a low temperature to minimize impurity diffusion. The elemental segregation in the as-drawn fibers was overcome by a thermal treatment. The transmission losses of the fibers were calculated as 28 dB/cm at 6.1 mu mathrm{m} wavelength