Application of sol-gel technique to synthesis of copper-cobalt spinel on the ferritic stainless steel used for solid oxide fuel cell interconnects

作者：Paknahad Pouyan; Askari Masoud^*; Ghorbanzadeh Milad

来源：Journal of Power Sources, 2014, 266: 79-87.

DOI：10.1016/j.jpowsour.2014.04.122

• Solid oxide fuel cell
• Metallic interconnects
• Spinel
• Coating
• Sol-gel

The conductive CuCo2O4 spinel coating is applied on the surface of the AISI 430 ferritic stainless steel by the dip-coating sol-gel process and it is evaluated in terms of the microstructure, oxidation resistance and electrical conductivity. The results show that the CuCO2O4 coating forms a double-layer scale consisting of a Cr, Fe-rich subscale and Cu-Co spinel top layer after 500 h in air at 800 degrees C. This scale is protective, acts as an effective barrier against Cr migration into the outer oxide layer and alleviates the cathode Cr-poisoning. The oxidation resistance is significantly enhanced by the protective coating with a parabolic rate constant of 5.8 x 10(-13) gr(2) cm(-4) s(-1), meanwhile the electrical conductivity is considerably improved due to inhibited growth of resistive Cr2O3 oxide scale. The area specific resistance at temperatures between 550 and 800 degrees C is in the range of 11.5 and 22.2 m Omega cm(2).

• 出版日期2014-11-15