Cu is doped to LaNiO to improve its electrochemical performance as a potential intermediate-temperature solid oxide fuel cell (IT-SOFC) cathode material. A new higher-order Ruddlesden-Popper (R-P) phase composition LaNiCuO, (LNC, 0.0 ≤ x ≤ 0.7) is synthesized using an EDTA-citrate process. The LNC cathode has a good chemical compatibility with the LaSrGaMgO (LSGM) electrolyte. A thermodynamic stability test shows that LNC is stable after 72 h exposure to 600, 700, and 800 °C in air. The LNC cathode shows chemical stability against CO, and a stable structure over 12 h in CO has been demonstrated. The thermal expansion coefficients (TECs) have been determined to be in the range of 14.1–14.6 × 10 K, close to that of the LSGM electrolyte. The Cu content (x) significantly affects the electrical conductivity and sinter density of LNC. LaNiCuO (LNC) displays the highest electrical conductivity value of which reaches about 383 to 319 S cm at 600–800 °C. In addition, Cu doping improves the electrochemical performance of LNC. The area specific resistance (ASR) of the LaNiCuO (LNC) cathode was found to be 0.045 Ω cm at 800 °C, which is significantly better than that of LN. The peak power density of a single cell using the LNC cathode is 526 mW cm at 800 °C, and a 200 h long-term test demonstrates good stability. These results indicate that LaNiCuO cathode is a promising cathode material for IT-SOFCs.

中文翻译：

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用于中温固体氧化物燃料电池的耐二氧化碳且无钴的 La4Ni3-xCuxO10±δ（x = 0、0.3、0.5 和 0.7）阴极

将 Cu 掺杂到 LaNiO 中可提高其作为潜在中温固体氧化物燃料电池 (IT-SOFC) 阴极材料的电化学性能。使用 EDTA-柠檬酸盐工艺合成了一种新的高阶 Ruddlesden-Popper (RP) 相组合物 LaNiCuO（LNC，0.0 ≤ x ≤ 0.7）。 LNC阴极与LaSrGaMgO（LSGM）电解质具有良好的化学相容性。热力学稳定性测试表明，LNC 在空气中暴露于 600、700 和 800 °C 72 小时后保持稳定。 LNC 阴极对 CO 表现出化学稳定性，并且在 CO 中具有超过 12 小时的稳定结构。热膨胀系数（TEC）已确定在 14.1–14.6 × 10 K 范围内，接近 LSGM 电解质的热膨胀系数。 Cu含量(x)显着影响LNC的电导率和烧结密度。 LaNiCuO (LNC) 显示出最高的电导率值，在 600–800 °C 时达到约 383 至 319 S cm。此外，Cu掺杂提高了LNC的电化学性能。 LaNiCuO (LNC) 阴极的面积比电阻 (ASR) 在 800 °C 时为 0.045 Ω·cm，明显优于 LN。使用LNC阴极的单电池在800℃下的峰值功率密度为526 mW cm，200 h的长期测试显示出良好的稳定性。这些结果表明 LaNiCuO 阴极是一种有前途的 IT-SOFC 阴极材料。