Effect of mixed-conducting interfacial layers on solid oxide fuel cell anode performance
- Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering
The interfacial resistance of Ni-Y{sub 2}O{sub 3}-stabilized ZrO{sub 2} (Ni-YSZ) anodes on YSZ electrolytes has been reduced by inserting thin interfacial layers of TiO{sub 2}-doped YSZ (YZT) or Y{sub 2}O{sub 3}-doped CeO{sub 2} (YDC). Impedance spectroscopy measurements at temperatures ranging from 600 to 750 C typically showed a high frequency arc (HFA) and a low frequency arc (LFA). The HFA was reduced by the addition of either interlayer, with a larger reduction for YDC. This presumably resulted from enhanced charge transfer due to the mixed conductivity and/or enhanced redox reaction rate of the interfacial layer. The LFA, which was apparently related to mass-transport processes, grew with decreasing YSZ surface roughness and increasing interlayer thickness. The overall interfacial resistance was minimized for layer thicknesses of {approximately} 0.5 {micro}m. The lowest interfacial resistances in 97% H{sub 2} + H{sub 2}O, 0.13 {Omega} cm{sup 2} at 750 C, and 0.29 {Omega}cm{sup 2} at 600 C, were obtained with 0.5 {micro}m thick YDC interfacial layers.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 653263
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 5 Vol. 145; ISSN 0013-4651; ISSN JESOAN
- Country of Publication:
- United States
- Language:
- English
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