YCrO_3电解质固体氧化物燃料电池制备及性能研究

Preparation and Characterization of YCrO_3 Electrolyte Solid Oxide Fuel Cell

采用溶胶–凝胶法制备YCr_(0.9)M_(0.1)O_3(M为Cr和Co)两种材料粉体,用共压法在370MPa压强下制成单电池。XRD结果显示1 000℃下煅烧的两种粉体都形成了很好的钙钛矿结构相,无明显杂相生成。电池横断面的SEM图显示电池内部电解质层较为致密,无断裂和分层现象。离子过滤法研究结果证明YC电解质中的载流子应该是氧离子。YCC电解质电池在550℃取得了197.97mW/cm2最大功率密度。对YC粉体材料进行XPS表征发现其表面存在氧空位,且经过燃料电池性能测试后的YC电解质材料表面的氧空位浓度显著增加。Co的掺杂提高了YC粉末的表面氧空位浓度,这应该是YCC电解质电池性能较高的原因。

YCr0.9M0.1O3（M,Cr and Co）powders were prepared by sol-gel method.Single cell with YC and YCC electrolyte was respectively fabricated by co-press method under 370 Mpa pressure.XRD results show that the two powders calcined at 1 000℃form a good perovskite structure with no obvious secondary phase formation.SEM cross section image shows that the electrolyte of the cell is dense enough,and there is no fracture and delamination.The results of ion filtration showed that carriers in YC electrolyte should be oxygen ions.The cell with YCC electrolyte achieved a maximum power density of 197.97 mW/cm^2 at 550℃.XPS result indicate that oxygen vacancies were existed on the surface of YC raw powders,and the surface oxygen vacancy concentration of YC in the cell increased significantly after the performance test of fuel cell.The doping of Co improves the surface oxygen vacancy concentration of YC powder,which should be the reason for the higher performance of the cell with YCC electrolyte.