Evaluation of MIEC Ce0.8Y0.1Mn0.1O2-δ Anode in Electrolyte-Supported SOFC

Abstract

In this study, the electrochemical performance of a single phase, mixed ion and electron conducting (MIEC) Ce0.8Y0.1Mn0.1O2-δ (10CYMO) anode was evaluated using symmetrical half-cell and full-cell configurations under humidified H2, 10 ppm H2S/H2, and CH4. An yttria-stabilized zirconia (YSZ) electrolyte support layer was used in this work, as ac impedance spectroscopy revealed that the 10CYMO/YSZ/10CYMO cell gave the lowest area specific polarization resistance (ASR) of 0.23 Ωcm2 at 800°C in wet H2, compared to La0.8Sr0.2Ga0.8Mg0.2O3-δ (LSGM) and Zr0.89Sc0.1Ce0.01O2-δ (ScSZ). Exposure of the 10CYMO anodes to 10 ppm H2S/H2, either in a half-cell or full cell configuration, showed slight enhancement on the electrochemical performance, which was explained using a concept describing the sulfur and ceria interaction. The performance of a 10CYMO/YSZ/La0.8Sr0.2MnO3-δ _ YSZ full cell was evaluated under 90%H2-N2/3%H2O, giving a power density of 75 mW/cm2 at 800°C and is better than seen for other fluorite-based anodes reported in the literature.