Abstract Composite materials consisting of acceptor doped lanthanum orthoniobate electrolyte phase (La0.98Ca0.02NbO4) and Li2O:NiO:ZnO semiconducting phase were synthesized. The precursor powder of La0.98Ca0.02NbO4 was prepared in nanocrystalline (mechanosynthesis) and microcrystalline (solid-state synthesis) form. The composite can be applied in a single-layer fuel cell, because of the presence of two phases acting as an anode and a cathode simultaneously. X-ray diffraction data show that the materials consist of two expected phases. Scanning Electron Microscope images, with Energy Dispersive X-Ray analysis show that La0.98Ca0.02NbO4 as well as Li2O:NiO:ZnO are mixed together in the volume of the material. Open circuit voltage both for nano- and microcrystalline composite do not exceed 0.8 V. The single-layer fuel cell is degrading upon time and the voltage drop is observed. The processes of ZnO reduction and Zn diffusion and evaporation as responsible for cell degradation are discussed.

中文翻译：

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用于单层燃料电池的陶瓷复合材料

摘要 合成了由受主掺杂的原铌酸镧电解质相(La0.98Ca0.02NbO4)和Li2O:NiO:ZnO半导体相组成的复合材料。La0.98Ca0.02NbO4 的前体粉末以纳米晶（机械合成）和微晶（固态合成）的形式制备。由于存在同时充当阳极和阴极的两相，该复合材料可应用于单层燃料电池。X 射线衍射数据表明材料由两个预期相组成。具有能量色散 X 射线分析的扫描电子显微镜图像显示，La0.98Ca0.02NbO4 以及 Li2O:NiO:ZnO 在材料体积中混合在一起。纳米和微晶复合材料的开路电压不超过 0.8 V。单层燃料电池随时间退化并观察到电压下降。讨论了导致电池降解的 ZnO 还原和 Zn 扩散和蒸发过程。