Ruddlesden-Popper phase materials for solid oxide fuel cell cathodes: A short review

In the last couple of decades, researchers have been working on Ruddlesden-Popper phases to realise them as components of solid oxide cells. Ruddlesden-Popper phase materials have been particularly proposed as materials for intermediate temperature solid oxide fuel cells (IT-SOFCs). As such a sizeable literature was produced on Ruddlesden-Popper phases and in this short review we look at these studies with a particular focus on the structural chemistry, oxygen transport and electrical conductivity, electrochemical performance, and stability of these materials under operating conditions. More specifically, the materials have been studied for cathodes and, therefore, we believe a review dedicated to cathode applications of these materials will be beneficial for the community. A brief outlook on the future directions in the field will also be provided.