ABSTRACT

Polyvinylidene fluoride (PVDF) is a kind of adhesive with high stability and good resistance to chemical corrosion, and it has been applied in various fields. In this work, PVDF was introduced into a semiconducting-ionic conductor material to fabricate a new electrolyte for low temperature solid oxide fuel cells (SOFCs). We prepared the LaCePr-carbonates (LCP)-Sr₂Fe_1.5Mo_0.5O_6−δ (SFM) in various mass ratios. A remarkable maximum power output of 505 mW cm⁻² was attained along with a high open circuit voltage (OCV) of 1.04 V at 550°C by the 8LCP-2SFM sample. The electrical properties of the composites with different weight ratios were studied through EIS measurements and polarization curves. It was found that performance can be enhanced by introducing an appropriate PVDF into an LCP-SFM composite. The composite of 8LCP-2SFM with wt. 3% PVDF exhibits a higher power output, that is up to 671 mW cm⁻², than other composite samples at 550°C. Interestingly, the performance can be further improved by a low temperature heat treatment. These findings confirm that mixing an appropriate PVDF into a composite is an effective way to improve the performance of the cells as well as the mechanical properties.

摘要

聚偏二氟乙烯（PVDF）是一种稳定性高、耐化学腐蚀的胶粘剂，已应用于各个领域。在这项工作中，将 PVDF 引入半导体离子导体材料中，以制造用于低温固体氧化物燃料电池 (SOFC) 的新型电解质。我们制备了各种质量比的 LaCePr-碳酸盐 (LCP)-Sr ₂ Fe _1.5 Mo _0.5 O _6-δ (SFM)。505 mW cm ^{-2 的}卓越最大功率输出8LCP-2SFM 样品在 550°C 下获得了 1.04 V 的高开路电压 (OCV)。通过EIS测量和极化曲线研究了具有不同重量比的复合材料的电性能。发现可以通过将适当的 PVDF 引入 LCP-SFM 复合材料来提高性能。8LCP-2SFM与wt的复合材料。3% PVDF在 550°C 下表现出更高的功率输出，即高达 671 mW cm ^-2，高于其他复合材料样品。有趣的是，低温热处理可以进一步提高性能。这些发现证实，将适当的 PVDF 混合到复合材料中是提高电池性能和机械性能的有效方法。