Ni and metal aluminate mixtures for solid oxide fuel cell anode supports

作者：Kwak But Ho; Youn Hyun Ki; Chung Jong Shik^*

来源：Journal of Power Sources, 2008, 185(2): 633-640.

DOI：10.1016/j.jpowsour.2008.09.009

• Solid oxide fuel cell
• Ni-MAl(2)O(4) mixtures
• Electrical conductivity
• Microstructure

Mixtures of nickel and metal aluminate (Ni-MAl(2)O(4) [M = Fe, Co, Ni and Cu]) were fabricated, and their electrical conductivities, microstructures and thermal expansions were measured. During the sintering of these mixtures, MAl(2)O(4) reacts with NiO to form NiAl(2)O(4) and MO which are thought to be the reasons for the differences in the microstructures and electrical properties. Except for FeAl(2)O(4), Ni-MAl(2)O(4) mixtures show metallic conductivity behavior and their electrical conductivities are sufficient for cell operation. Their thermal expansion coefficients are much lower than conventional Ni-YSZ mixtures and closer to the 8YSZ electrolyte. The peak power densities of single cells Supported with Ni-NiAl(2)O(4) and Ni-CoAl(2)O(4) are 410 and 440 mW cm(-2) at 850 degrees C, respectively, which are lower than 490 mW cm(-2) of Ni-YSZ. This is due to the polarization resistances of functional anode layer. The Ni-CuAl(2)O(4)-supported cell has no electrical performance because of Cu migration and segregation.

• 出版日期2008-12-1