Ce0.8Sm0.2O1.9@TiO2异质结构电解质研究

Study on Ce0.8Sm0.2O1.9@TiO2 Heterostructure Electrolyte

半导体与离子导体形成的异质结构可以极大地增强材料的离子电导率,其两相界面能为离子传输提供较好的通道。以TiO2与Ce0.8Sm0.2O1.9(samarium doped ceria,SDC)为研究对象,分别通过湿化学法和干混法构造了两种不同的异质结构复合材料。研究表明,利用湿化学法制备的SDC@TiO2异质结构复合材料(简称SDC@TiO2)作电解质的燃料电池在550℃下最大输出功率密度为761 mW·cm^-2,比用干混法制备的SDC-TiO2异质结构复合材料(简称SDC-TiO2)作电解质的燃料电池的最大输出功率密度高21%。与SDC-TiO2相比,SDC@TiO2具有更丰富的两相界面。电化学阻抗谱显示,以SDC@TiO2材料作为电解质的电池具有更低的欧姆电阻和极化电阻。

Heterostructure composed of semiconductor and ionic conductor can greatly enhance the ionic conductivity of material,in which two-phase interfaces can provide good channel for ion transportation.Taking TiO2 and Ce0.8Sm0.2O1.9(samarium doped ceria,SDC)as the research objects,two kinds of heterostructure composites were constructed by wet chemical method and dry mixing method,respectively.The study indicates that the maximum output power density of fuel cell using wetchemical-method-prepared SDC@TiO2 heterostructure composite(abbreviated as SDC@TiO2)as electrolyte is 761 mW·cm^-2 at 550℃,which is 21%higher than that of fuel cell using dry-mixingmethod-prepared SDC-TiO2 heterostructure composite(abbreviated as SDC-TiO2)as electrolyte.Compared with SDC-TiO2,the SDC@TiO2 has more abundant two-phase interfaces.The electrochemical impedance spectrum shows that the cell using the SDC@TiO2 material as electrolyte has lower ohmic resistance and polarization resistance.