Ba2YCu3O6+δ-based cathode material for proton-conducting solid oxide fuel cells
Ba 2 YCu 3 O 6+δ (BYC) is a prototypical superconducting oxide showing a superior mixed electronic and ionic conductivity at a temperature lower than 650 °C, but there is limited work on its possible application for low-temperature solid oxide fuel cells. Ba 2 MCu 3 O 6+δ (M = Y, Gd, Ho and Eu) oxides are studied as cathode materials for a proton-conducting solid oxide fuel cell (H–SOFC) and the polarization resistance ( R p ) reached around 0.29 Ω cm 2 at 650 °C in the ambient air, and the activation energy of R p was found to decrease with the electronegativity of the rare-earth element. Fe doping on Cu site of BYC has a negative effect on the electric conductivity of the oxide in the air but it enhances the electrochemical performance especially the power output of the full cell and structural stability under a slightly reducing atmosphere, e.g. pure Ar. The H–SOFC with BYC cathode showed a peak power of 175 mW cm −2 at 650 °C, which can be increased to 375 mW cm −2 by Fe doping on the Cu site as in Ba 2 YCu 2.6 Fe 0.4 O 6+δ .
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