- 著者
- Shungo TAKANO Kiyoto SHIN-MURA Eiki NIWA Takuya HASHIMOTO Kazuya SASAKI
- 出版者
- The Ceramic Society of Japan
- 雑誌
- Journal of the Ceramic Society of Japan (ISSN:18820743)
- 巻号頁・発行日
- vol.126, no.6, pp.482-487, 2018-06-01 (Released:2018-06-01)
- 参考文献数
- 32
- 被引用文献数
- 1 6
Sr2MgMoO6−δ (SMM) is one of promising anode materials for direct internal reforming solid oxide fuel cells as its excellent performance has been demonstrated. However, it is necessary to be chemically compatible with the electrolyte material to realize the original performance. In this study, we investigate chemical compatibility between SMM and typical electrolyte materials (8% mol Y2O3–92% mol ZrO2; YSZ, 10% mol Sc2O3–1% mol CeO2–89% mol ZrO2; ScSZ, La0.9Sr0.1Ga0.8Mg0.2O3−δ; LSGM) and anode interlayer materials (Gd0.1Ce0.9O2−δ; GDC, Ce0.8La0.2O2−δ; LDC) under conditions for preparing SMM electrode and operation. SMM formed a reaction layer with all of the typical electrolyte materials studied. LDC was the only material for the interlayer that maintains chemical compatibility with SMM, though it forms the reaction layer with YSZ and ScSZ. From these results, this study clarifies that LSGM and LDC should be used as electrolyte and interlayer, respectively, when SMM is used as the anode.
- 著者
- Kazuya SASAKI Kiyoto SHIN-MURA
- 出版者
- The Ceramic Society of Japan
- 雑誌
- Journal of the Ceramic Society of Japan (ISSN:18820743)
- 巻号頁・発行日
- vol.125, no.6, pp.487-493, 2017-06-01 (Released:2017-06-01)
- 参考文献数
- 62
- 被引用文献数
- 3 5
A high purity powder of Sr2MgMoO6−δ (SMM) was synthesized by a solid-state reaction under atmosphere-controlled conditions. The powder was sintered at a relatively low temperature (1200°C) to prepare compacts with high grain boundary density. SMM is a promising anode material for solid oxide fuel cells and hence, the samples were characterized under conditions relevant to this application. The electrical conductivity values of SMM under various oxygen partial pressures (pO2 = 10−15–104.3 Pa) over the temperature range of 300–850°C were measured by AC impedance spectroscopy. The grain boundary resistivity and bulk resistivity exhibited different oxygen-partial-pressure-dependent behavior. Electron conduction is proposed as the primary mechanism for electrical conductivity in the bulk of the sintered body of SMM under both low and high oxygen partial pressures. Electron conduction and oxygen ion conduction were found to be the primary mechanisms for electrical conductivity at the grain boundary of SMM under low and high oxygen partial pressures, respectively.