کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
193060 | 459760 | 2009 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Electrochemical characterization of Co-doped Sr0.8Ce0.2MnO3−δ cathodes on Sm0.2Ce0.8O1.9-electrolyte for intermediate-temperature solid oxide fuel cells Electrochemical characterization of Co-doped Sr0.8Ce0.2MnO3−δ cathodes on Sm0.2Ce0.8O1.9-electrolyte for intermediate-temperature solid oxide fuel cells](/preview/png/193060.png)
Electrochemical properties of Co-doped Sr0.8Ce0.2MnO3−δ cathode were investigated at the cathode/Sm0.2Ce0.8O1.9 electrolyte interface. The electrochemical impedance spectroscopy was measured under applied cathodic voltages (E = −0.4 to 0 V). At E = 0 V, the area-specific resistance decreased from 2.20 Ω cm2 to 0.19 Ω cm2 at 700 °C with Co doping. Under the cathodic polarization, the rate determining step of oxygen reduction process was different for both cathodes: the charge transfer for Sr0.8Ce0.2MnO3−δ and the diffusion process for Sr0.8Ce0.2Mn0.8Co0.2O3−δ. Besides, the overpotential also decreased from 124 mV to 19 mV at the current density of 0.1 A cm−2 at 800 °C with Co doping. The improved electrochemical properties of Co-doped Sr0.8Ce0.2MnO3−δ can be ascribed to the formation of more oxygen vacancies and more active sites for oxygen reduction reaction.
Journal: Electrochimica Acta - Volume 54, Issue 13, 1 May 2009, Pages 3532–3537