Lowering the Air‐Electrode Interfacial Resistance in Medium‐Temperature Solid Oxide Fuel Cells

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Abstract
A new approach for lowering the air‐electrode interfacial resistance in medium‐temperature solid oxide fuel cells is described. Thin interfacial layers of (YSB) were interposed between Ag electrodes and (YSZ) electrolytes and their resistance measured in air using complex impedance analysis. The layers were deposited by magnetron sputtering. decreased as the YSB thickness increased, approaching the value for Ag on bulk YSB. For example, at 750°C decreased from ≈10 Ω‐cm2 for Ag on YSZ to ≈1.6 Ω‐cm2 for . Larger values yielded , 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 up to ≈50 nm; the thickness variation of was thus readily explained by the variation of the YSB and YSZ surface areas. Initial results for on YSZ with a 50 nm thick YSB layer yielded at 750°C.

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