Pr_1.8La_0.2Ni_0.74Cu_0.21Ga_0.05O_4+¦Ä as a potential cathode material with CO₂ resistance for intermediate temperature solid oxide fuel cell

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• 作者：Shujun Peng ; Yanying Wei ; Jian Xue ; Yan Chen ; Haihui Wang
• 关键词：Pr1.8La0.2Ni0.74Cu0.21Ga0.05O4+¦Ä ; Intermediate temperature solid oxide fuel cell ; Electrochemical performance ; CO2 resistance ; Stability
• 刊名：International Journal of Hydrogen Energy
• 出版年：2013
• 出版时间：21 August, 2013
• 年：2013
• 卷：38
• 期：25
• 页码：10552-10558
• 全文大小：1764 K

文摘

Pr_1.8La_0.2Ni_0.74Cu_0.21Ga_0.05O_4+¦Ä (PLNCG), a mixed ionic electron conductor (MIEC) with a K₂NiF₄-type structure, has been studied as a potential cathode material based on YSZ (ZrO₂ with 8?mol % Y₂O₃) electrolyte for intermediate temperature solid oxide fuel cells (IT-SOFCs). The X-ray diffraction (XRD) analysis reveals that the good chemical compatibility between the PLNCG and YSZ. The maximum electric conductivity of the PLNCG appeared at about 460?¡ãC and the value was 32?S?cm^?1 in air and 34?S?cm^?1 in O₂, respectively. A hollow fiber SOFC was fabricated with the PLNCG as the cathode, NiO-YSZ (1:1; w/w) as the anode and YSZ as the electrolyte. The maximum power density of the cell is 876?mW?cm^?2 and the corresponding polarization resistance of the cell is 0.41?¦¸?cm² at 750?¡ãC. Furthermore, the PLNCG cathode shows an excellent CO₂ resistance in the operation temperature range. The maximum power density of the cell is similar to that when the cathode is exposed to air. Furthermore, the cell performance is stable when the CO₂ concentrations in the air vary from 0 to 10?vol. % at both 700 and 750?¡ãC. These results indicate that the PLNCG can be a good candidate for CO₂ resistance cathode materials of IT-SOFCs based on YSZ electrolyte.