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| Abstract No.: |
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| Title: |
Plasma-sprayed (Bi2O3)0.705 (Er2O3)0.245 (WO3)0.05 electrolyte for high performance intermediate-temperature solid oxide fuel cells (IT-SOFCs)
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| Authors: |
Chang-Jiu Li / Xi'an Jiaotong University, P.R. China
Rui Chen* / Xi'an Jiaotong University, P.R. China
Shan-Lin Zhang/ Xi'an Jiaotong University, China
Cheng-Xin Li/ Xi'an Jiaotong University, China
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| Abstract: |
Bismuth oxide doped with rare earth elements and stabilized in the fluorite structure (´-Bi2O3) exhibits high oxygen ion conductivity in mediate temperature, which is promising electrolyte material for intermediate temperature solid oxide fuel cells (IT-SOFCs). In this study, regarding to the low melting point and possibility to deposit dense electrolyte by plasma spraying, EWSB spray powders were prepared by sinter-crushing and EWSB electrolyte was deposited by plasma spraying. It was confirmed that the synthesized ternary solid solutions compound Bi2O3Er2O3WO3 (( Bi2O3)0.705 (Er2O3)0.245 (WO3)0.05, EWSB) presents high ion conductivity of à =0.16 S cm-1 at 700 °C and excellent stability. The phase structure and cross-sctional microstructure of plasma-sprayed EWSB were characterized by RXD and SEM. The ionic conductivity of plasma-sprayed EWSB was measured. Results showed that the as-plasma-sprayed EWSB presents a dense microstructure with well bonded lamellae. More important fact is that the coating presents the same phase structure as that of powder, which contributes high ionic conductivity along with dense microstructure. The The SOFC cell was also assembled with Ni-based anode and LaxSr1-xCoyFe1-yO3 cathode to examine the performance of plasma-sprayed electrolyte. The relationships between EWSB deposit microstructure, ionic conductivity and cell output performance are examined.
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