Studies on Electrochemical Performance of Mn- and Y-Codoped CeO2 under Pure and Impure Hydrogen Fuels
Here, we report synthesis and electrochemical properties of novel nanostructured CYMO (Ce0.8Y0.1Mn0.1O2-δ) prepared by autocombustion method using metal salt precursors. The investigated samples were characterized using several solid state techniques such as powder X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive x-ray spectroscopy (EDX), and infrared spectroscopy (IR). The electrochemical performance of the prepared anode was tested using a symmetrical cell CYMO/YSZ/CYMO at 600-800○C in humidified H2 / N2 under open circuit and polarization conditions using ac electrochemical impedance spectroscopy (EIS) and DC method. Area specific resistance (ASR) of 0.3 Ωcm2 at 800oC was observed for CYMO and is comparable to that of Ni-YSZ / Ni-ScSZr (0.185 Ωcm2)1 and La0.65Ce0.1Sr0.25Cr0.5Mn0.5O3-δ (0.2 Ωcm2) .2 Interestingly, a noticeable enhancement in the performance of the symmetrical cell was observed upon exposing the cell to 10 ppm H2S in H2 / N2 (Fig.1). In this talk, a detailed analysis for electrochemical results will be presented.