Pure NiO or lithiated NiO with distinct Li/Ni atomic proportions (50/50—LN55 and 30/70—LN37) were tested as protective barrier layers (PBLs) to enhance the stability of LaCoO₃ (LC) electrodes in cells with composite electrolytes (CEs) consisting of Gd‐doped ceria (CGO) and a eutectic mixture of Na and Li carbonates (NLCs). PBLs and LC layers were sequentially deposited by screen printing before firing at 700°C and 550°C, respectively, to yield symmetrical cells (LC|PBL|CE|PBL|LC). Electrochemical testing involved impedance spectroscopy measurements in air in the 500°C to 650°C range. Scanning electron microscopy combined with energy‐dispersive X‐ray spectroscopy (SEM/EDS) revealed that distinct PBLs possess uneven wetting tendency, with impact on the role of LC layers. The best electrode performance (0.55 Ω cm² electrode area specific resistance at 550°C in air) was observed using the LN37 PBL, stable throughout endurance tests up to 200 hours. Possible electrode mechanisms consistent with experimental evidence suggest an active role of the molten phase as an intermediate provider of O²⁻ transport between the electrode and CGO.

中文翻译：

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用于熔融碳酸盐封闭的电极保护阻挡层

测试了具有不同Li / Ni原子比例（50 / 50-LN55和30 / 70-LN37）的纯NiO或锂化NiO作为保护性阻挡层（PBL），以增强LaCoO ₃（LC）电极在含复合电解质的电池中的稳定性（CEs）由掺Gd的二氧化铈（CGO）以及碳酸钠和碳酸锂的共晶混合物（NLC）组成。通过丝网印刷依次沉积PBL和LC层，然后分别在700°C和550°C焙烧，以产生对称单元（LC | PBL | CE | PBL | LC）。电化学测试涉及在500°C至650°C的空气中进行阻抗谱测量。扫描电子显微镜与能量色散X射线光谱法（SEM / EDS）结合显示，不同的PBL具有不均匀的润湿趋势，并影响LC层的作用。最佳电极性能（0.55Ωcm使用LN37 PBL在550°C的空气中观察到^2个电极面积的电阻率，在长达200小时的整个耐久试验中均保持稳定。与实验证据一致的可能的电极机理表明，熔融相作为电极和CGO之间O ^2-传输的中间提供者发挥了积极作用。