(169k) Influence of Reaction Parameters on the Exsolution of Ni-Ru Bimetallic Alloy in GEO-Inspired Perovskite

Results from our previous studies has corroborate our central hypothesis that various parameters (temperature, dwell time, H₂ reducing agent) and rich defect chemistry (cation and oxygen vacancies) of GEO-inspired perovskite oxides (GEOs) can be used to tune the size, shape, and composition of exsolved Ni nanoparticles from Ni-doped LaFeO₃ perovskite oxide. The presentation will detail the synthesis of Ru-doped LaNiO₃ GEO-perovskite precursors using the citrate-nitrate sol-gel combustion methods (analogous to the Pechini method). The concentration of Ru dopant in LaNiO₃ is varied from 1 -10%. The samples are calcined between 700-900 °C. The GEO precursors will initially be reduced at 700 °C in 5% H₂/He at varying dwell time from 30 minutes to 2 hours. Reduction temperature will then be varied from 600-800 °C. The GEOs will be characterized using XRD, ICP-OES, and STEM to determine the crystallinity, atomic elemental analysis, and morphology of the materials. We hypothesize that alloying mechanism of Ni-Ru bimetallic nanoparticles may occur simultaneously; co-exsolution, based on the reduction potential of both metals.