Solovyev Andrey, Shipilova Anna, Smolyanskiy Egor
Institute of High Current Electronics SB RAS, 634055 Tomsk, Russia.
Department of Physics, National Research Tomsk State University, 634050 Tomsk, Russia.
Membranes (Basel). 2023 Jun 5;13(6):585. doi: 10.3390/membranes13060585.
Samarium-doped ceria (SDC) is considered as an alternative electrolyte material for intermediate-temperature solid oxide fuel cells (IT-SOFCs) because its conductivity is higher than that of commonly used yttria-stabilized zirconia (YSZ). The paper compares the properties of anode-supported SOFCs with magnetron sputtered single-layer SDC and multilayer SDC/YSZ/SDC thin-film electrolyte, with the YSZ blocking layer 0.5, 1, and 1.5 μm thick. The thickness of the upper and lower SDC layers of the multilayer electrolyte are constant and amount to 3 and 1 μm, respectively. The thickness of single-layer SDC electrolyte is 5.5 μm. The SOFC performance is studied by measuring current-voltage characteristics and impedance spectra in the range of 500-800 °C. X-ray diffraction and scanning electron microscopy are used to investigate the structure of the deposited electrolyte and other fuel cell layers. SOFCs with the single-layer SDC electrolyte show the best performance at 650 °C. At this temperature, open circuit voltage and maximum power density are 0.8 V and 651 mW/cm, respectively. The formation of the SDC electrolyte with the YSZ blocking layer improves the open circuit voltage up to 1.1 V and increases the maximum power density at the temperatures over 600 °C. It is shown that the optimal thickness of the YSZ blocking layer is 1 µm. The fuel cell with the multilayer SDC/YSZ/SDC electrolyte, with the layer thicknesses of 3/1/1 µm, has the maximum power density of 2263 and 1132 mW/cm at 800 and 650 °C, respectively.
钐掺杂二氧化铈（SDC）被认为是中温固体氧化物燃料电池（IT-SOFC）的一种替代电解质材料，因为其电导率高于常用的氧化钇稳定氧化锆（YSZ）。本文比较了阳极支撑的SOFC与磁控溅射单层SDC和多层SDC/YSZ/SDC薄膜电解质的性能，其中YSZ阻挡层的厚度分别为0.5、1和1.5μm。多层电解质的上下SDC层厚度恒定，分别为3μm和1μm。单层SDC电解质的厚度为5.5μm。通过测量500-800°C范围内的电流-电压特性和阻抗谱来研究SOFC的性能。利用X射线衍射和扫描电子显微镜研究沉积电解质和其他燃料电池层的结构。具有单层SDC电解质 的SOFC在650°C时表现出最佳性能。在此温度下，开路电压和最大功率密度分别为0.8V和651mW/cm²。带有YSZ阻挡层的SDC电解质的形成将开路电压提高到1.1V，并在600°C以上的温度下提高了最大功率密度。结果表明，YSZ阻挡层的最佳厚度为1μm。具有3/1/1μm层厚度的多层SDC/YSZ/SDC电解质的燃料电池在800°C和650°C时的最大功率密度分别为2263和1132mW/cm²。
