BaZr(0.8)Y(0.2)O(3-delta)-NiO Composite Anodic Powders for Proton-Conducting SOFCs Prepared by a Combustion Method

Authors

Lei Bi, National Institute for Materials Science, Japan
Emiliana Fabbri, National Institute for Materials Science, Japan
Ziqi Sun, University of WollongongFollow
Enrico Traversa, National Institute for Materials Science, Japan

RIS ID

57236

Publication Details

Bi, L, Fabbri, E, Sun, Z & Traversa, E (2011), BaZr(0.8)Y(0.2)O(3-delta)-NiO Composite Anodic Powders for Proton-Conducting SOFCs Prepared by a Combustion Method, Journal of the Electrochemical Society, 158(7), pp. B797-B803.

Abstract

BaZr_0.8Y_0.2O_3-∂ (BZY)-NiO composite powders with different BZY-NiO weight ratios were prepared by a combustion method as anodes for proton-conducting solid oxide fuel cells (SOFCs). After heating to 1100^°C for 6 h, the composite powders were made of a well-dispersed mixture of two phases, BZY and NiO. Chemical stability tests showed that the BZY-NiO anodic powders had good stability against CO₂, whereas comparative tests under the same conditions showed degradation for BaCe_0.7Zr_0.1Y_0.2O_3-∂- NiO, which is at present the most used anode material for proton-conducting SOFCs. Area specific resistance (ASR) measurements for BZY-NiO anodes showed that their electrochemical performance depended on the BZY-NiO weight ratio. The best performance was obtained for the anode containing 50 wt % BZY and 50 wt % NiO, which showed the smallest ASR values in the whole testing temperature range (0.37 Ω cm2 at 600^°C). The 50 wt % BZY and 50 wt % NiO anode prepared by combustion also showed superior performance than that of the BZY-NiO anode conventionally made by a mechanical mixing route, as well as that of Pt.