Optimized Sol-Gel Routes to Synthesize Yttria-Stabilized Zirconia Thin Films as Solid Electrolytes for Solid Oxide Fuel Cells

作者：Courtin Emilie^*; Boy Philippe; Rouhet Clement; Bianchi Luc; Bruneton Eric; Poirot Nathalie; Laberty Robert Christel; Sanchez Clement

来源：Chemistry of Materials, 2012, 24(23): 4540-4548.

DOI：10.1021/cm302177s

• solid oxide fuel cells
• sol-gel
• thin films
• 8 percent Y2O3-ZrO2
• electrolyte
• fuel cell performance

Sol-gel strategies are carefully evaluated and compared to synthesize electrolyte materials for Intermediate Temperature SOFCs (Solid Oxide Fuel Cells). Robust 10-20 mu m thick cubic Yttria-Stabilized Zirconia (YSZ), (Y2O3)(0.08)(ZrO2)(0.92), films have been prepared by using nanocomposite stable sols composed with "sol-gel made" YSZ binders and YSZ powder. Two different strategies have been investigated for the synthesis of 8YSZ binders: a mixed alkoxide-nitrate route in alcoholic media, and an environment-friendly hydrothermal route, in water media. Ionic conductivities of similar to 2.5 x 10(-2) S cm(-1) are obtained at 800 degrees C for powders made by the hydrothermal and the alkoxide routes. Films synthesized from composite sols that contain commercial YSZ powder and the organic binder or the water-based binder, have been deposited on YSZ-NiO cermets and integrated in an entire single fuel cell. The two optimized routes yield to gastight YSZ electrolytes. In particular with the organic-based binder, a maximum power density of 250 mW cm(-2) at 850 degrees C has been achieved. The proposed route can be extended to other materials for different applications such as ferroelectric and dielectric materials.

• 出版日期2012-12-11
• 单位中国地震局