Fu Xinmin, Meng Xiangwei, Sun Chuxiao, Wei Maobin, Jiang Haipeng, Lü Shiquan, Gong Weijiang
College of Sciences, Northeastern University, Shenyang 110819, China.
School of Materials Science and Engineering, Hanshan Normal University, Chaozhou, Guangdong 521041, China.
ACS Appl Mater Interfaces. 2024 Jul 17;16(28):36236-36246. doi: 10.1021/acsami.4c03564. Epub 2024 Jul 8.
The double perovskite oxide PrBaFeO has great potential as a cathode material for solid oxide fuel cells (SOFCs). However, the electrochemical characteristics of Fe-based double perovskites are relatively inferior. To improve its electrochemical performance, Ca is investigated to partially replace Pr, forming PrCaBaFeO (PCBF, = 0.0-0.3) by an electrospinning technique. The PCBF nanofibers exhibited a crystalline structure characterized by orthorhombic symmetry and space group 4/. Furthermore, these PCBF nanofibers displayed exceptional chemical compatibility with the SmCeO (SDC) electrolyte when sintered at a temperature of 900 °C for 5 h. The X-ray photoelectron spectroscopy (XPS) analysis reveals a progressive increase in the Fe concentration as the Ca doping level rises. The polarization resistances () of the PCBF00, PCBF01, PCBF02, and PCBF03 nanofiber cathodes were 0.103, 0.079, 0.056, and 0.048 Ω cm at 750 °C. In the meantime, doping Ca increases the peak power density of the single cell by 46%, from 762.80 (PCBF00) to 1114.85 (PCBF03) mW cm at 750 °C. The results demonstrate that PCBF03 double perovskite nanofibers exhibit great potential as cathode materials for SOFCs.
双钙钛矿氧化物PrBaFeO作为固体氧化物燃料电池（SOFC）的阴极材料具有巨大潜力。然而，铁基双钙钛矿的电化学特性相对较差。为了提高其电化学性能，研究了用Ca部分替代Pr，通过静电纺丝技术制备PrCaBaFeO（PCBF， = 0.0 - 0.3）。PCBF纳米纤维呈现出以正交对称和空间群4/为特征的晶体结构。此外，当在900℃烧结5小时时，这些PCBF纳米纤维与SmCeO（SDC）电解质表现出优异的化学相容性。X射线光电子能谱（XPS）分析表明，随着Ca掺杂水平的提高，Fe浓度逐渐增加。PCBF00、PCBF01、PCBF02和PCBF03纳米纤维阴极在750℃时的极化电阻（）分别为0.103、0.079、0.056和0.048Ω·cm。同时，掺杂Ca使单电池的峰值功率密度在750℃时从762.80（PCBF00）增加到1114.85（PCBF03）mW·cm，提高了46%。结果表明，PCBF03双钙钛矿纳米纤维作为SOFC的阴极材料具有巨大潜力。
