Diffusion behavior of Ni during high temperature co-sintering was quantitatively investigated for anode-supported solid oxide fuel cells (SOFCs) that had BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3− δ (BZCYYb) proton-conducting electrolyte and NiO-BZCYYb anode. Although diffused Ni in such SOFCs effectively acts as a sintering aid to densify the BZCYYb electrolyte layer, it often negatively affects the electrolyte conductivity. In the present study, field emission electron probe microanalysis (with wavelength dispersive X-ray spectroscopy) clearly revealed that Ni diffused into the BZCYYb electrolyte layer, and that the amount of diffused Ni increased with increasing co-sintering temperature. In particular, relatively high Ni concentration within the electrolyte layer was observed near the electrolyte/anode interface, e.g., approximately 1.5 and 2.8 wt% at co-sintering temperature of 1300 and 1400 °C, respectively. Electrochemical measurements showed that, compared with the lower co-sintering temperatures (1300–1350 °C), the highest co-sintering temperature (1400 °C) led to the highest ohmic resistance because of lower electrolyte conductivity. These results suggest that high co-sintering temperature causes excessive Ni diffusion into the BZCYYb electrolyte layer, thus degrading the intrinsic electrolyte conductivity and consequently degrading the SOFC performance.

中文翻译：

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在阳极负载的固体氧化物燃料电池中高温共烧结过程中 Ni 扩散到 BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3-δ 电解质中的影响

对具有 BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3− δ (BZCYYb) 质子传导电解质和 NiO-BZCYYb 阳极的阳极支撑固体氧化物燃料电池 (SOFC) 在高温共烧结过程中 Ni 的扩散行为进行了定量研究. 尽管在此类 SOFC 中扩散的 Ni 有效地充当了烧结助剂以致密化 BZCYYb 电解质层，但它通常会对电解质的电导率产生负面影响。在本研究中，场发射电子探针微量分析（使用波长色散 X 射线光谱）清楚地表明 Ni 扩散到 BZCYYb 电解质层中，并且扩散的 Ni 量随着共烧结温度的增加而增加。特别是，在电解质/阳极界面附近观察到电解质层内相对较高的 Ni 浓度，例如大约 1.5 和 2。在 1300 和 1400 °C 的共烧结温度下分别为 8 wt%。电化学测量表明，与较低的共烧结温度（1300-1350 °C）相比，由于较低的电解质电导率，最高的共烧结温度（1400 °C）导致最高的欧姆电阻。这些结果表明，高共烧结温度会导致 Ni 过度扩散到 BZCYYb 电解质层中，从而降低固有的电解质电导率，从而降低 SOFC 的性能。