Important Roles of Ceria-Based Materials on Durability of Hydrogen and Oxygen Electrodes for Reversible SOEC/SOFC

Abstract

We have examined the durability of oxygen and hydrogen electrodes for reversible solid oxide cells (R-SOCs). The use of a dense, uniform samaria-doped ceria (SDC) interlayer was very important to obtain high performance and high durability of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) ‒ SDC composite oxygen electrode. Double-layer hydrogen electrodes, consisting of SDC scaffold with highly dispersed Ni–Co nanoparticles as the catalyst layer (CL) and a thin current collecting layer (CCL) of either Ni–SDC or Ni–YSZ cermet, exhibited nearly identical initial performance at 800°C, while the use of Ni–YSZ CCL together with three-dimensional network of Ni in the CL resulted in higher durability.