In the present work, La_1.9M_0.1Ce₂O₇ (M = Nd, Sm, Dy, Y, In) powders are synthesized by citric acid-nitrate sol-gel combustion method. The effects of the acceptor dopant on the phase structure, microstructure and electrical properties of La_1.9M_0.1Ce₂O₇ ceramics are investigated. All La_1.9M_0.1Ce₂O₇ ceramics possess a single-phase fluorite structure. It turns out that the In-doped ceramic exhibits the highest electrical conductivity of 0.82 × 10⁻² and 2.03 × 10⁻² S cm⁻¹ at 700 °C both in dry air and wet 5% H₂Ar atmospheres, respectively. Furthermore, in order to eliminate the internal short circuit resulting from the reduction of Ce⁴⁺ to Ce³⁺, a novel NiBaCe_0.5Zr_0.3Dy_0.2O_3-δ composite is applied and evaluated as the anode for the fuel cell based on La_1.9In_0.1Ce₂O₇ electrolyte. Raman and scanning electron microscope and energy dispersive spectrometer analyses indicate that a Ba-containing electron-blocking layer is formed in-situ at the anode/electrolyte interface. The new structured fuel cell with NiBaCe_0.5Zr_0.3Dy_0.2O_3-δ anode and La_1.9In_0.1Ce₂O₇ electrolyte exhibit significantly improved open circuit voltage of 1.005 V along with maximum power density of 546 mW cm⁻² at 700 °C using humidified hydrogen fuel. The results demonstrate that La_1.9In_0.1Ce₂O₇ electrolyte and NiBaCe_0.5Zr_0.3Dy_0.2O_3-δ anode can be considered as the promising candidates for solid oxide fuel cells applications.

在目前的工作中，通过柠檬酸-硝酸盐溶胶-凝胶燃烧法合成了La _1.9 M _0.1 Ce ₂ O ₇（M = Nd，Sm，Dy，Y，In）粉末。研究了受体掺杂剂对La _1.9 M _0.1 Ce ₂ O ₇陶瓷的相结构，微观结构和电性能的影响。所有La _1.9 M _0.1 Ce ₂ O ₇陶瓷都具有单相萤石结构。事实证明，掺杂In的陶瓷具有0.82×10 ^-2和2.03×10 ^-2  S cm的最高电导率分别在干燥空气和5％H ₂ Ar潮湿气氛中于700°C ^-1。此外，为了消除由于Ce ⁴⁺还原为Ce ³⁺而引起的内部短路，应用了新型的Ni BaCe _0.5 Zr _0.3 Dy _0.2 O3 _-δ复合材料，并基于此对燃料电池的负极进行了评估。 La _1.9 In _0.1 Ce ₂ O ₇电解质。拉曼和扫描电子显微镜以及能量色散光谱仪分析表明，在阳极/电解质界面处原位形成了含Ba的电子阻挡层。新型结构化燃料电池具有Ni BaCe _0.5 Zr _0.3 Dy _0.2 O3 _-δ阳极和La _1.9 In _0.1 Ce ₂ O ₇电解质，在1.005 V时表现出明显改善的开路电压，在700时的最大功率密度为546 mW cm ^-2。 °C使用加湿氢气燃料。结果表明，La _1.9 In _0.1 Ce ₂ O ₇电解质和Ni BaCe _0.5 Zr _0.3 Dy _0.2 O3 _-δ阳极可被视为固体氧化物燃料电池应用的有前途的候选者。