Redox tolerance of thin and thick Ni/YSZ anodes of electrolyte-supported single-chamber solid oxide fuel cells under methane oxidation conditions
MetadataShow full item record
Redox tolerance of 50 and 500 lm thick Ni/YSZ (yttria-stabilized zirconia) anodes supported on YSZ electrolytes were studied under single-chamber solid oxide fuel cell conditions. Open circuit voltage, electrochemical impedance spectra, and discharge curves of the cells were measured under different methane/oxygen ratios at 700°C. For the cell with the thin anode, a significant degradation accompanying oscillatory behaviors was observed, whereas the cell based on the thick anode was much more stable under the same conditions. In situ local anode resistance (Rs) results indicated that the Ni/NiO redox cycling was responsible for the oscillatory behaviors, and the cell degradation was primarily caused by the Ni reoxidation. Reoxidation of the thick anode took place at a low methane/oxygen ratio, but the anode can be recovered to its original state by switching to a methane rich environment. On the contrary, the thin anode was unable to be regenerated after the oxidation. Microstructure damage of the anode was attributed to its irreversible degradation.
Showing items related by title, author, creator and subject.
In situ fabrication of (Sr,La)FeO<inf>4</inf> with CoFe alloy nanoparticles as an independent catalyst layer for direct methane-based solid oxide fuel cells with a nickel cermet anodeChang, H.; Chen, H.; Shao, Zongping; Shi, J.; Bai, J.; Li, S. (2016)© 2016 The Royal Society of Chemistry.An independent catalyst layer is applied to develop a highly effective way to reduce coking when operating in methane based fuels, in which the catalyst layer is separated from a Ni ...
A new symmetric solid-oxide fuel cell with La0.8Sr0.2Sc0.2Mn0.8O3-d perovskite oxide as both the anode and cathodeZheng, Y.; Zhang, C.; Ran, R.; Cai, R.; Shao, Zongping; Farrusseng, D. (2009)A novel perovskite-type La0.8Sr0.2Sc0.2Mn0.8O3 (LSSM) oxide was synthesized and evaluated as the electrode material of a symmetric solid-oxide fuel cell. Characterization was done by electrical conductivity, crystal ...
Stable direct-methane solid oxide fuel cells with calcium-oxide-modified nickel-based anodes operating at reduced temperaturesQu, J.; Wang, W.; Chen, Y.; Deng, X.; Shao, Zongping (2016)In this study, some basic oxide additives are introduced into the conventional Ni–Ce0.8Sm0.2O1.9 (SDC) cermet anodes of solid oxide fuel cells (SOFCs) for using methane as the fuel. The effects of incorporating basic ...