The phase evolution, electrical stability and chemical compatibility of sealing glass–ceramics for solid oxide fuel cell applications: effect of La2O3 or CeO2
The phase evolution, electrical stability and chemical compatibility of sealing glass–ceramics for solid oxide fuel cell applications: effect of La2O3 or CeO2
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DOI：
10.1039/c5ra23357g
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发表时间：
2016-02
期刊：
影响因子：
3.9
通讯作者：
Honglin Liu;Du Xinhang;Zhiwu Yu;D. Tang;Teng Zhang
中科院分区：
文献类型：
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作者：
Honglin Liu;Du Xinhang;Zhiwu Yu;D. Tang;Teng Zhang
尽管稀土氧化物可以改善微晶玻璃的封接性能，但这些微晶玻璃在固体氧化物燃料电池（SOFC）运行条件下的电稳定性仍然不明确。本文系统地研究了掺杂La_2O_3或CeO_2的微晶玻璃在SOFC运行条件下的电稳定性。具有La 2 O3掺杂剂的玻璃-陶瓷材料在SOFC操作条件下表现出良好的电稳定性;而含CeO 2的玻璃-陶瓷材料的电导率的降低可能与导电相的形成有关，即，CeO2。特别是，相的演变和玻璃陶瓷的电导率的变化之间的关系已被清楚地证明。此外，在750 °C下保持1000小时后，密封玻璃陶瓷与8mol%氧化钇稳定的氧化锆（8 YSZ）电解质表现出良好的化学相容性。报道的结果支持的适用性的La 2 O3含玻璃陶瓷作为密封材料的SOFC应用。
In spite of the fact that rare earth oxides can improve the sealing properties of glass–ceramics, the electrical stability of these glass–ceramics under Solid Oxide Fuel Cell (SOFC) operational conditions still remains ambiguous. In this work, the electrical stability of glass–ceramics doped with La2O3 or CeO2 under SOFC operational conditions has been systematically investigated. The glass–ceramic material with La2O3 dopant exhibits good electrical stability under SOFC operational conditions; whereas, a decrease in the conductivity of the CeO2-containing glass–ceramic material can be related to the formation of a conductive phase, i.e., CeO2. In particular, the relationship between the phase evolution and the change in conductivity of glass–ceramics has been clearly demonstrated. Moreover, the sealing glass–ceramics show good chemical compatibility with 8 mol% yttria-stabilized zirconia (8YSZ) electrolyte, after being held at 750 °C for 1000 hours. The reported results support the suitability of La2O3-containing glass–ceramic as a sealing material for SOFC applications.