Solid oxide fuel cells (SOFCs) have emerged as promising energy conversion devices, offering high efficiency and environmental sustainability. Efficient electrode materials are crucial for the overall cell performance of SOFCs. Perovskite type NdSrMnCrO (x = 0.25, 0.5) (NSCM25, NSCM50) was synthesized via conventional solid-state reaction technique. Structural, thermal and electrochemical characterizations were performed using X-ray diffraction, thermogravimetric analysis, conductivity measurements, scanning electron microscope, thermal expansion coefficient analysis and impedance spectroscopy. Structural analysis revealed that both compositions exhibit orthorhombic symmetry in the Pbnm space group. Thermogravimetric analysis (TGA) indicated minimal weight changes in both pre-reduced and as-prepared samples. The electrical conductivities in air at 600 ℃ were found to be 1.69 S/cm for NSCM25 and 4.91 S/cm for NSCM50, with a decrease observed under reduced oxygen partial pressure. Polarization resistance () analysis was conducted on symmetrical cells composed of NSCM25|GDC|NSCM25, NSCM50|GDC|NSCM50, NSCM25|YSZ|NSCM25, and NSCM50|YSZ|NSCM50. At 900 ℃, the polarization resistances were 0.12 Ωcm, 0.21 Ωcm, 0.11 Ωcm, and 0.67 Ωcm, respectively. The results suggest that NSCM25 and NSCM50 hold promise as electrode materials for symmetrical solid oxide fuel cells (SSOFC) employing YSZ or GDC electrolyte.

中文翻译：

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用于对称固体氧化物燃料电池的新型掺SR NdMn0.5Cr0.5O3-δ电极


固体氧化物燃料电池（SOFC）已成为有前途的能源转换装置，具有高效率和环境可持续性。高效的电极材料对于 SOFC 的整体电池性能至关重要。通过常规固相反应技术合成了钙钛矿型 NdSrMnCrO (x = 0.25, 0.5) (NSCM25, NSCM50)。使用 X 射线衍射、热重分析、电导率测量、扫描电子显微镜、热膨胀系数分析和阻抗谱进行结构、热和电化学表征。结构分析表明，两种成分在 Pbnm 空间群中均表现出斜方对称性。热重分析 (TGA) 表明预还原样品和制备样品的重量变化极小。 600 ℃空气中的电导率，NSCM25 为 1.69 S/cm，NSCM50 为 4.91 S/cm，在降低氧分压下观察到电导率下降。对由 NSCM25|GDC|NSCM25、NSCM50|GDC|NSCM50、NSCM25|YSZ|NSCM25 和 NSCM50|YSZ|NSCM50 组成的对称电池进行极化电阻 () 分析。 900℃时，极化电阻分别为0.12Ωcm、0.21Ωcm、0.11Ωcm和0.67Ωcm。结果表明，NSCM25 和 NSCM50 有希望作为采用 YSZ 或 GDC 电解质的对称固体氧化物燃料电池 (SSOFC) 的电极材料。