Thin film ceria-bismuth bilayer electrolytes for intermediate temperature solid oxide fuel cells with La0.85Sr0.15MnO3--Y0.25Bi0.75O1.5 cathode

Journal Article · · Mater. Res. Bull.

DOI:https://doi.org/10.1016/j.materresbull.2010.01.013· OSTI ID:1064738

Zhang, Lei ^[1]; Xia, Changrong ^[1]; Zhao, Fei ^[2]; Chen, Fanglin ^[3]

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1. Univ. of Science and Technology of China, Hefei (China)
2. Univ. of Science and Technology of China, Hefei (China); Univ. of South Carolina, Columbia, SC (United States)
3. Univ. of South Carolina, Columbia, SC (United States)

Thin film electrolytes of bilayer bismuth oxide/ceria are developed for intermediate temperature solid oxide fuel cells. Y_0.25Bi_0.75O_1.5 is deposited via Direct Current magnetron sputtering technique on an Sm_0.2Ce_0.8O_1.90 electrolyte film which is prepared by a dry-pressing process on an NiO–Sm_0.2Ce_0.8O_1.90 substrate. La_0.85Sr_0.15MnO_3-δ–Y_0.25Bi_0.75O_1.5 composite is applied onto the Y_0.25Bi_0.75O_1.5 film as the cathode to form a single cell. Cells with 6-μm-thick Y_0.25Bi_0.75O_1.5 and 26-μm-thick Sm_0.2Ce _0.8O_1.90 bilayer electrolytes exhibit improved open circuit voltages and power density compared with those obtained with only Sm_0.2Ce_0.8O_1.90 electrolytes. The open circuit voltages are comparable and power densities are higher than those previously reported for solid oxide fuel cells with thick bilayer electrolytes using noble metals such as Pt as the electrodes. Impedance spectra show that the change of electrolyte resistance is negligible while the cathodic interfacial polarization resistance decreased significantly when the Y_0.25Bi_0.75O_1.5 layer is added to form the Sm_0.2Ce _0.8O_1.90/Y_0.25Bi_0.75O_1.5 bilayer electrolytes.

• Research Organization: Energy Frontier Research Centers (EFRC); Heterogeneous Functional Materials Center (HeteroFoaM)
• Sponsoring Organization: USDOE SC Office of Basic Energy Sciences (SC-22)
• DOE Contract Number: SC0001061
• OSTI ID: 1064738
• Journal Information: Mater. Res. Bull., Journal Name: Mater. Res. Bull. Journal Issue: 5 Vol. 45
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
carbon sequestration
catalysis (heterogeneous)
charge transport
energy storage (including batteries and capacitors)
hydrogen and fuel cells
materials and chemistry by design
mechanical behavior
membrane
synthesis (novel materials)
synthesis (scalable processing)
synthesis (self-assembly)