Electrochemical performance and stability of the cathode for solid oxide fuel cells: V. high performance and stable Pr₂NiO₄ as the cathode for solid oxide fuel cells

详细信息	查看全文 | 推荐本文 |

• 作者：X.-D. Zhou^a ; ^{xiao-dong.zhou@sc.edu} ; J.W. Templeton^b ; Z. Nie^b ; H. Chen^a ; J.W. Stevenson^b ; L.R. Pederson^b
• 关键词：Cathode ; Solid oxide fuel cells ; Stability ; Performance ; Impedance
• 刊名：Electrochimica Acta
• 出版年：2012
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：1 June, 2012
• 卷：71
• 期：Complete
• 页码：44-49
• 文件大小：611 K

摘要

The polarization loss due to oxygen reduction at the cathode in solid oxide fuel cells is a thermally activated process; therefore, as temperature is lowered, the loss becomes substantial. Highly active cathodes have been investigated by several groups; equally important, if not more, is the stability of these electrodes. The high performance and stable Pr₂NiO₄ cathode was studied by impedance spectroscopy and dc current-potential sweeping methods. The power density in Pr₂NiO₄-based anode supported button cells was in the range between 0.65 and 0.7 W/cm² at 750 掳C at the external load of 0.8 V. The degradation rate at 0.8 V was approximately 3%per 1000 h up to 2000 h. The electrode resistance is a function of external loads, thus also varies with current densities. The relationship between electrode resistance and external loads is non-linear, which may changes in lattice oxygen nonstoichiometry of the cathodes.