School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Korea.
Phys Chem Chem Phys. 2013 Dec 7;15(45):19906-12. doi: 10.1039/c3cp53883d. Epub 2013 Oct 23.
Cobalt-containing cathodes often encounter problems such as high thermal expansion coefficients (TEC) and poor stability, making them unsuitable for practical use as cathode materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs). This study focuses on the effects of Cu doping in the Co site of SmBa0.5Sr0.5Co2O5+δ in terms of structural characteristics, electrical properties, electrochemical performance, redox properties, and performance stability as an IT-SOFC cathode material. The TEC value of a SmBa0.5Sr0.5Co1.5Cu0.5O5+δ (SBSCCu50) sample is 12.8 × 10(-6) K(-1), which is lower than that (13.7 × 10(-6) K(-1)) of a SmBa0.5Sr0.5Co2O5+δ (SBSCO) sample at 700 °C. SBSCCu50 showed higher redox stability at lower p(O2) and a more stable cell power output while retaining desirable electrochemical performance, as compared with SBSCO. SBSCCu50 displayed reduced TEC values and enhanced redox and performance stability, as well as satisfactory electrical properties and electrochemical performance under typical fuel cell operating conditions. The results indicate that SBSCCu50 is a promising material as a cathode for IT-SOFCs.
含钴的阴极通常会遇到热膨胀系数（TEC）高和稳定性差等问题，因此不适合作为中温固体氧化物燃料电池（IT-SOFC）的阴极材料。本研究关注的是 Cu 在 SmBa0.5Sr0.5Co2O5+δ 的 Co 位掺杂对结构特性、电性能、电化学性能、氧化还原性能和性能稳定性的影响，作为 IT-SOFC 阴极材料。SmBa0.5Sr0.5Co1.5Cu0.5O5+δ（SBSCCu50）样品的 TEC 值为 12.8×10(-6) K(-1)，低于 700°C 时 SmBa0.5Sr0.5Co2O5+δ（SBSCO）样品的 TEC 值（13.7×10(-6) K(-1)）。与 SBSCO 相比，SBSCCu50 在较低的 p(O2)下具有更高的氧化还原稳定性和更稳定的电池功率输出，同时保持了理想的电化学性能。与 SBSCO 相比，SBSCCu50 的 TEC 值降低，氧化还原和性能稳定性增强，在典型的燃料电池工作条件下具有令人满意的电性能和电化学性能。结果表明，SBSCCu50 是一种很有前途的 IT-SOFC 阴极材料。
