Interface Diffusion and Compatibility of (Ba,La)FeO Perovskite Electrodes in Contact with Barium Zirconate and Ceria.

BaLaFeO perovskites (BLF) capable of conducting electrons, protons, and oxygen ions are promising oxygen electrodes for efficient solid oxide cells (fuel cells or electrolyzers), an integral part of prospected large-scale power-to-gas energy storage systems. We investigated the compatibility of BLF with lanthanum content between 5 and 50%, in contact with oxide-ion-conducting CeGdO and proton-conducting BaZrYO electrolytes, annealing the electrode-electrolyte bilayers at high temperature to simulate thermal stresses of fabrication and prolonged operation. By employing both bulk X-ray diffraction and synchrotron X-ray microspectroscopy, we present a space-resolved picture of the interaction between electrode and electrolyte as what concerns cation interdiffusion, exsolution, and phase stability.

Multi-analytical study of the medieval wall paintings from the rupestrian church at Lentini (eastern Sicily): new evidence of the use of woad ().

Unlabelled: This study presents the results of the examination and characterisation of the wall paintings that decorate the rupestrian church named , which is located in the territory of Lentini (eastern Sicily, few tens of kilometres from Catania and Syracuse). The earliest mural paintings in the church date back to the twelfth century AD. A multi-analytical approach was adopted for the characterisation of stone materials, secondary degradation products, and pigments.