Proton conducting oxide electrolytes find potential application in proton ceramic fuel cells and electrolyzers operating at intermediate temperatures, e.g. 400–600 °C. However, state-of-the-art proton conducting ceramics based on Y-doped BaZrO₃ (BZY) have lower thermal expansion coefficient (TEC) than most commonly applied or conceived supporting electrode structures, making the assembly vulnerable to degradation due to cracks or spallation. We have increased the TEC of 20 mol% Y-doped BZY (BZY20) by partially substituting Ba and Zr with Sr and Ce, respectively, to levels which still maintain the cubic structure and sufficiently minor n-type conduction; (Ba_0.85Sr_0.15)(Zr_0.7Ce_0.1Y_0.2)O_2.9 (BSZCY151020). High temperature XRD shows that this material has a cubic structure (space group $\mathit{Pm}\overline{3}m$) in the temperature range of 25–1150 °C and a linear TEC of ~10 × 10⁻⁶ K⁻¹, as compared to the ~8 × 10⁻⁶ K⁻¹ for BZY. It exhibited a DC conductivity of ~5 mS cm⁻¹ at 600 °C in wet H₂. This electrolyte with increased TEC may find application in proton ceramic electrochemical cells in general and metal supported ones in particular.

质子传导氧化物电解质在质子陶瓷燃料电池和在中等温度（例如400–600°C）下运行的电解槽中发现了潜在的应用。但是，基于Y掺杂的BaZrO ₃（BZY）的最先进的质子传导陶瓷的热膨胀系数（TEC）比最常用或设想的支撑电极结构低，这使得该组件容易因裂纹或裂纹而退化。散裂。通过分别用Sr和Ce分别代替Ba和Zr，使TEC浓度增加了20 mol％的Y掺杂BZY（BZY20），使其仍保持立方结构和足够小的n型导电性。（Ba _0.85 Sr _0.15）（Zr _0.7 Ce _0.1 Y _0.2O _2.9（BSZCY151020）。高温XRD显示该材料具有立方结构（空间群$\mathit{下午}\overline{3}米$）的温度范围为25–1150°C，线性TEC为〜10×10 ^-6  K ^-1，而BZY的线性TEC为〜8 ×10 ^-6  K ^-1。在湿H ₂下，在600°C下，其直流电导率为〜5 mS cm ^-1。具有增加的TEC的这种电解质通常可用于质子陶瓷电化学电池中，特别是在金属负载的电化学电池中。