To address the ongoing environmental crisis, hydrogen emerges as an appealing pathway for facilitating large-scale decarbonization efforts. Concurrently, the development of highly efficient devices is imperative, and Solid Oxide Fuel Cells (SOFCs) present significant potential in this regard. Presently, hydrogen storage stands as a major bottleneck hindering the widespread adoption of this technology. Hence, ammonia emerges as a promising hydrogen carrier due to the presence of well-established plants, its carbon-free nature, and a narrower flammability range compared to hydrogen and hydrocarbons. Nonetheless, the realization of materials and devices tailored for operating SOFCs with ammonia fuel must be strategically planned.  
The utilization of supported nanoparticles systems has garnered increased attention for their versatility and potential to achieve advanced performance across various applications including chemical conversion, and electrochemistry. The exsolution of single metal/alloy nanoparticles represents an emerging method to address common issues associated with nanomaterials, such as chemical poisoning or coalescence at high temperatures, owing to their robust interaction with the support material. Recent studies have revealed that the environmental conditions strongly influence the morphology of exsolved nanoparticles, thereby offering opportunities to tailor their activity for specific applications.
Hereby, we synthesized and studied titanates with different A-site deficiency and increasing Fe content in B-site in order to increment the exsolution and reducing the working temperature, respectively. Indeed, samples, (La_0.50Sr_0.50)_1-αNi_0.05Ti_1-xFe_xO₃ with α = 0.10 and 0.20 and x = 0.05, 0.35 and 0.60, convert ammonia in hydrogen and nitrogen without production of NOx in 400 – 750 °C range. Prepared samples were firstly characterized structurally and morphologically by X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) to study the dispersion of NPs on the surface and their chemical nature (Fe and NiFe NPs). Durability tests were performed in order to preliminary evaluate the corrosive effect of ammonia on the powders that detect the presence of superficial nitrogen though XPS measurements. Electrochemical tests were performed by preparing button cell prototype via screen printing using both hydrogen and ammonia as fuel. Impedance Spectroscopy was exploited to identify physic processes involved in ammonia decomposition respect to pure hydrogen in a wide temperature range (400-900°C) to also understand the role of A-site deficiency and Fe content on electrochemical properties. Finally, spent cell prototype were investigated by microscopies to study damages brough by ammonia.