Ni-CGO阳极支撑ScSZ/CGO复合电解质电池的制备及性能

PREPARATION AND ELECTROCHEMICAL PROPERTIES OF NiO–CGO ANODE SUPPORT SOLID OXIDE FUEL CELL WITH ScSZ/CGO COMPOSITE ELECTROLYTE

用柠檬酸溶胶–凝胶法合成了Ce0.85Gd0.15O2–δ(CGO),用共沉淀法合成了掺摩尔分数为11%Sc2O3稳定的ZrO2(scandium oxide-stabilized zirconia,ScSZ)电解质材料。通过X射线衍射和透射电镜对电解质材料的物相、形貌和成分进行表征。结果表明:CGO和ScSZ在各自的煅烧温度下均形成了单一的立方萤石结构晶态;ScSZ颗粒的粒径约为20nm。用共压法分别制备了以NiO–CGO阳极支撑的CGO单层电解质和ScSZ/CGO复合电解质的基体,并在基体上涂覆阴极制作单电池。在650～800℃范围内测试单电池的电性能。结果表明:ScSZ/CGO双层电解质电池的开路电压和最大功率密度均高于单层CGO电解质电池;在800℃电流密度和功率密度达到最大值,分别为677.5mA/cm2和197.3mW/cm2。说明ScSZ/CGO双层电解质有效地提高了电池的性能。

Ce0.85Gd0.15O2-δ （CGO） electrolyte material was prepared by the citrate sol-gel method, and an 11% （in mole） Sc2O3-doped ZrO2 （ScSZ） electrolyte material was prepared by the co-precipitation method. The phase, microstructure and composition of the electrolyte materials were analyzed by X-ray diffraction and transmission electron microscopy. The results reveal that the CGO and ScSZ have a cubic fluorite structure, and the mean diameter of the grains of the ScSZ is about 20 nm. The NiO-CGO anode support of single-layered CGO electrolyte and bilayer ScSZ/CGO electrolyte substrate were prepared by the co-pressing method. Then the cathode materials were spread on the substrate to produce a single battery. Single cells with NiO-CGO anode and CGO or ScSZ/CGO electrolyte were tested in a temperature range of 650-800℃. The results show that the open-circuit voltage and corresponding peak power density of the cell with ScSZ/CGO bilayer electrolyte are higher than the cell with single-layered CGO electrolyte under the same conditions. At 800 ℃ the peak current density and the peak power density of ScSZ/CGO bilayer electrolyte reach maximum values of 677.5 mA/cm^2 and 197.3 mW/cm^2, respectively. This indicates that the ScSZ/CGO bilayer electrolyte can raise the performance of cells effectively.