期刊
CERAMICS INTERNATIONAL
卷 44, 期 3, 页码 3134-3140出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.11.081
关键词
Solid oxide fuel cell (SOFC); Proton-conducting oxide; Ni diffusion; Co-sintering; Conductivity; Electron probe microanalysis (EPMA)
资金
- Japan Society for the Promotion of Science (JSPS) KAKENHI [JP15K18239]
- Grants-in-Aid for Scientific Research [15K18239] Funding Source: KAKEN
Diffusion behavior of Ni during high temperature co-sintering was quantitatively investigated for anode-supported solid oxide fuel cells (SOFCs) that had BaZr0.1Ce0.7Y0.1Yb0.1O3-delta (BZCYYb) proton-conducting electrolyte and NiO-BZCYYb anode. Although diffused Ni in such SOFCs effectively acts as a sintering aid to densify the BZCYYb electrolyte layer, it often negatively affects the electrolyte conductivity. In the present study, field emission electron probe microanalysis (with wavelength dispersive X-ray spectroscopy) clearly revealed that Ni diffused into the BZCYYb electrolyte layer, and that the amount of diffused Ni increased with increasing co-sintering temperature. In particular, relatively high Ni concentration within the electrolyte layer was observed near the electrolyte/anode interface, e.g., approximately 1.5 and 2.8 wt% at co-sintering temperature of 1300 and 1400 degrees C, respectively. Electrochemical measurements showed that, compared with the lower co-sintering temperatures (1300-1350 degrees C), the highest co-sintering temperature (1400 degrees C) led to the highest ohmic resistance because of lower electrolyte conductivity. These results suggest that high co-sintering temperature causes excessive Ni diffusion into the BZCYYb electrolyte layer, thus degrading the intrinsic electrolyte conductivity and consequently degrading the SOFC performance.
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