Lowering the air-electrode interfacial resistance in medium-temperature solid oxide fuel cells
- Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering
A new approach for lowering the air-electrode interfacial resistance in medium-temperature solid oxide fuel cells is described in this paper. Thin interfacial layers of (Y[sub 2]O[sub 3])[sub 0.25](Bi[sub 2]O[sub 3])[sub 0.75] (YSB) were interposed between Ag electrodes and (Y[sub 2]O[sub 3])[sub 0.1](ZrO[sub 2])[sub 0.9] (YSZ) electrolytes and their resistance r, measured in air using complex impedance analysis. The layers were deposited by magnetron sputtering r, decreased as the YSB thickness t[sub YSB] increased, approaching the value for Ag on bulk YSB. For example, at 750[degrees]C r, decreased from [approximately] 10[Omega]cm[sup 2] for Ag on YSZ to [approximately] 1.6[Omega] cm[sup 2] for T[sub YSB] = 50 nm. Larger T[sub YSB] values yielded r, [approximately] 1.5 [Omega]cm[sup 2], the same as the value for Ag on a YSB electrolyte. Auger electron spectroscopy measurements showed that the coverage of YSZ surfaces by YSB increased rapidly with increasing t[sub YSB] up to [approximately] 50nm; the thickness variation of r, was thus readily explained by the variation of the YSB and YSZ surface areas. Initial results for (La[sub 0.7]Sr[sub 0.3])CoO[sub 3] on YSZ with a 50 nm thick YSB layer yielded r = 0.4 [Omega]cm[sup 2] at 750[degrees]C.
- OSTI ID:
- 6732088
- Journal Information:
- Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 139:10; ISSN JESOAN; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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