Microstructure and performance of La0.58Sr0.4Co0.2Fe0.8O3鈭?span style='font-style: italic'>未 cathodes deposited on BaCe0.2Zr0.7Y0.1O3鈭?span style='font-style
- 作者：Sandrine Ricotea ; sari@dtu.dk ; Nikolaos Bonanosa ; Per Martin Rø ; rvikb ; Camilla Haavikb
- 关键词：BCZY ; LSCF ; PCFC ; Spray pyrolysis ; Cathode material ; Infiltration
- 刊名：Journal of Power Sources
- 出版年：2012
- 期刊代码：58_03787753
- 类别：ce
- 出版时间：1 July, 2012
- 卷：209
- 期：Complete
- 页码：172-179
- 文件大小：1245 K
摘要
La0.58Sr0.4Co0.2Fe0.8O3鈭捨?/sub> (LSCF) cathodes have been deposited on proton-conducting BaCe0.2Zr0.7Y0.1O3鈭捨?/sub> (BCZY27) electrolyte and studied in symmetric cells to investigate the cathode microstructure and electrochemical performance. Three different types of cathodes have been prepared: two prepared from a solution, infiltrated into a screen-printed BZCY27 porous backbone (4 and 12 infiltrations), and one prepared by spray pyrolysis onto a polished electrolyte. In all three cases, LSCF is obtained after annealing at 700 掳C for 2 h. Analysis of the electrochemical impedance spectra between 450 掳C and 600 掳C in air, with varying p(H2O), reveals that the charge transfer contribution is the lowest for the backbone-infiltrated cathode while the oxygen dissociation/adsorption contribution is the lowest for the spray-pyrolyzed cathode. The area specific resistances increase with the water vapor pressure. The area specific resistances obtained are 0.61 惟 cm2 and 0.89 惟 cm2 at 600 掳C for the spray-pyrolyzed LSCF cell in dry and humidified air, respectively; the corresponding resistances are 0.63 惟 cm2 and 0.98 惟 cm2 for the 12 times infiltrated LSCF cell. These resistances are the lowest reported for LSCF cathodes on Ba(Ce,Zr)O3-based electrolytes and show the promise of low-temperature fabrication methods for these systems.
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