Effect of Co doping on the properties of Sr0.8Ce0.2MnO3−δ cathode for intermediate-temperature solid-oxide fuel cells

2008 ◽  
Vol 33 (17) ◽  
pp. 4681-4688 ◽  
Author(s):  
Haitao Gu ◽  
Han Chen ◽  
Ling Gao ◽  
Yifeng Zheng ◽  
Xiaofang Zhu ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Intermediate Temperature ◽  
Oxide Fuel ◽  
Co Doping

Effects of trivalent dopants on phase stability and catalytic activity of YBaCo4O7-based cathodes in solid oxide fuel cells

2018 ◽  
Vol 6 (34) ◽  
pp. 16412-16420 ◽  
Author(s):  
Ke-Yu Lai ◽  
Arumugam Manthiram
Keyword(s):  
Catalytic Activity ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Phase Stability ◽  
Solid Oxide ◽  
Intermediate Temperature ◽  
Oxide Fuel ◽  
Co Doping ◽  
Doping Effects ◽  
Trivalent Cations

In order to understand the doping and co-doping effects of trivalent cations (Al3+, Ga3+, and Fe3+) in the swedenborgite oxide YBaCo4O7 as a cathode in intermediate-temperature SOFCs, four series of YBaCo4O7-based materials, including YBaCo4−xAlxO7+δ, YBaCo4−x−yGaxAlyO7+δ, YBaCo3.2Ga0.8−xFexO7+δ, and YBaCo3.5−xAl0.5FexO7+δ, have been synthesized and investigated.

Sintering Mechanisms of Cobalt-Doped Ceria and Zirconia Electrolytes in Intermediate-Temperature Solid Oxide Fuel Cells

2010 ◽  
Vol 8 (1) ◽  
Author(s):  
Masashi Mori ◽  
Zhenwei Wang ◽  
Takanori Itoh
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Xrd Analysis ◽  
Liquid Phase Sintering ◽  
Solid Oxide ◽  
Intermediate Temperature ◽  
Cubic Phase ◽  
Oxide Fuel ◽  
Co Doping ◽  
Co Doped

Ce 0.9 Gd 0.1 O 1.95 (CGO) and (ZrO2)0.89(Sc2O3)0.1(CeO2)0.01 (ScSZ) have been proposed as possible alternative electrolytes in intermediate-temperature solid oxide fuel cells (SOFCs). In this study, the mechanisms of densely sintering Co-doped CGO and ScSZ electrolytes during the SOFC fabrication process were investigated using synchrotron X-ray diffraction (SR-XRD) analysis. The addition of CoO enhanced the sintering characteristics of both CGO and ScSZ. Based on the results of the SR-XRD analysis, it was found that CGO and CoO did not form a solid solution after heat treatment at 1200°C for 10 h. On the other hand, the solubility limit of Co in ScSZ was estimated to be ≤3 mol % after firing at 1400°C, and Co doping accelerated the conversion of the two phases of the fluorite structures with cubic and rhombohedral phases into a single cubic phase. Because no significant densification of the Co-doped ScSZ samples was observed before and after the phase change and Co diffusion, it suggests that these reaction sintering processes should not be strongly related to densification. From the results of scanning electron microscopy, Co doping suggests to assist the densification of the ScSZ samples through liquid phase sintering, similar to Co-doped CGO.

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