A novel low Cr-containing Fe-Cr-Co alloy for metallic interconnects in planar intermediate temperature solid oxide fuel cells

作者：Zhang, Wenying; Yan, Dong^*; Yang, Jie; Chen, Jing; Chi, Bo; Pu, Jian; Li, Jian

来源：Journal of Power Sources, 2014, 271: 25-31.

DOI：10.1016/j.jpowsour.2014.07.170

• Solid oxide fuel cells
• Metallic interconnect
• Oxidation resistance
• Chromium deposition
• Area specific resistance

A newly developed low-Cr containing Fe-Cr-Co alloy, named as FeCro, is evaluated as a candidate material of metallic interconnects for intermediate temperature solid oxide fuel cells (IT-SOFCs). This alloy possesses excellent oxidation resistance and adequate electrical conductivity at 750 degrees C in air, and shows slight Cr deposition in/around La0.72Sr0.18MnO3(LSM) electrode under a harsh accelerating condition of 400 mA cm(-2) and 850 degrees C. The thickness of the oxide scale thermally grown at 750 degrees C in air for 1000 his less than 1 mu m, presenting a double-layered structure with dense (Mn, Cr)(3)O-4 on the top of Cr2O3. The oxidation kinetics at 750 degrees C obeys the parabolic law with a low rate constant of 1.42 x 10(-15) g(2) cm(-4) s(-1). The Cr deposition in/around the LSM electrode in the presence of the FeCro alloy is remarkably reduced, compared to the commercial Crofer 22H alloy. The measured area specific resistance (ASR) at 750 degrees C in air after 1000 h isothermal oxidation is 14 m Omega cm(2). It is the unique microstructure of the formed oxide scale that significantly enhances the resistances of the FeCro alloy to oxidation and Cr volatilization.

• 出版日期2014-12-20
• 单位河南工业大学; 华中科技大学; 中国地质大学（北京）