烧结助剂对固体氧化物电池的质子导体电解质烧结性能和电导率影响的研究进展

Research Advances in the Effect of Additives on the Sinterability and Conductivity of Proton-conducting Electrolyte for Solid Oxide Cells

摘要:

质子导体氧化物在600 °C下具有较高的质子导电性，在应用于开发低成本、耐用的中低温固体氧化物电池方面具有显著的优势。目前，BaZr1-xYxO3-δ (BZY)，BaCe0.7-xZrxY0.2O3-δ (BCZY)和BaCe0.7-xZrxY0.1Yb0.1O3-δ (BCZYYb)等基于Ba、Ce、Zr、Y和Yb的ABO3型钙钛矿结构的质子导体电解质材料具有最优异的电化学性能。但是这些材料的烧结性能，电导性能和稳定性难以兼得，从而严重限制了它们的应用。为了在较低的烧结温度下获得具有高导电率和长期稳定的致密的电解质，最常用的方法是在质子导体氧化物中添加烧结助剂。而最近报道的研究论文中，烧结助剂对质子导体导电性的影响存在较大的差异。所以本综述全面讨论了近年来烧结助剂改性的质子导电氧化物的研究进展，并详细总结了不同烧结助剂对质子导电氧化物相对密度、晶粒生长、烧结行为、体电导率和晶界电导率的影响，进而提出一些潜在的研究思路。

Abstract:

Proton-conducting oxides show high proton conductivity operating below 600 °C, which offers a significant advantage in developing low cost and durable solid oxide cells (SOCs) at intermediate-to-low temperature. The ABO3 perovskites based on Ba, Ce, Zr, Y, and Yb are state-of-the-art proton conductors such as BaZr1-xYxO3-δ (BZY), BaCe0.7-xZrxY0.2O3-δ (BCZY), and BaCe0.7-xZrxY0.1Yb0.1O3-δ (BCZYYb). However, it is very difficult for these materials to balance the sinterability, conductivity and stability. To achieve dense electrolyte with high conductivity and long-term stability at the low sintering temperature, one of the most common approach is adding sintering aids in the fabrication processing of proton-conducting oxides. In recent researches, the effect of sintering additives on the electrical conductivity of proton conductors are still in the arguments. This review provides a comprehensive discussion of recent research developments on sintering additives modified proton conducting oxide. Moreover, we summary in detail the influence of different sintering additives on the relative density, grain growth, sintering behavior, and bulk and boundary conductivity of proton conducting oxides, as well as pointing out the potential research directions.