Lanthanum chromite-based materials for solid oxide fuel cell interconnects

One of the challenges for advancing solid oxide fuel cell (SOFC) technology is the development of interconnect materials with adequate conductivity and stability for efficient long-term use. One of the most promising interconnect materials is doped lanthanum chromite, which has good conductivity at high temperatures and is stable in oxidizing and reducing atmospheres. In this paper, the effects of strontium, calcium and other dopants on properties relevant for application as a SOFC interconnect material, including conductivity, defect chemistry, chemical stability, thermal expansion and mechanical strength, are reviewed.