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Evaluation of Stress Conditions in Operated Anode Supported Type Cells Based on In-situ Raman Scattering Spectroscopy

机译:基于原位拉曼散射光谱的阳极支撑型手术细胞的应激条件评估

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We have developed a method for evaluating stress conditions in operated SOFCs based on in-situ Raman scattering spectroscopy. This method uses F_(2g) vibration mode of CeCO_2 in interlayer of anode supported type SOFC as a probe, and we can calculate stress in an interlayer, i.e. stress in an electrolyte from the shift of a Raman peak. We apply this method to typical anode supported type cells and evaluate stress conditions during operation. Using this method, stress conditions in the electrolyte before operation is evaluated to be compressive, consistent with XRD and literature. During operation, stress conditions changed by the reduction of NiO to Ni; the compressive stress changed to tensile. In addition, the standard deviation of stresses became larger than before re-oxidation, and nonreversible. These results indicate that compressive residual stress introduced into the electrolyte during fabrication process is relaxed, and suggest that an electrolyte becomes mechanically unstable during operation.
机译:我们已经开发了一种基于原位拉曼散射光谱技术评估操作SOFC的应力条件的方法。该方法使用阳极支撑型SOFC的夹层中CeCO_2的F_(2g)振动模式作为探针,我们可以根据拉曼峰的移动来计算夹层中的应力,即电解质中的应力。我们将此方法应用于典型的阳极支撑型电池,并评估操作过程中的应力条件。使用此方法,可以评估操作前电解液中的应力状态是否具有压缩性,与XRD和文献一致。在操作过程中,由于NiO还原为Ni,应力条件发生了变化。压缩应力变为拉伸应力。另外,应力的标准偏差变得比再氧化前大,并且是不可逆的。这些结果表明,在制造过程中引入到电解质中的压缩残余应力得到缓和,并且表明电解质在操作过程中变得机械不稳定。

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