Publication date: 10th April 2024
A-site layered double perovskites, derived from the parent material PrBaMn2O5+δ, have demonstrated exceptional suitability as electrode materials in solid oxide fuel cells (SOFCs). By introducing catalytically active metal cations onto the B-site of a single perovskite oxide, it becomes feasible to induce the exsolution of metal nanoparticles on the surface through a phase transition to the double perovskite structure under reducing conditions. Palladium, renowned for its outstanding catalytic activity, has been utilized in various applications, leveraging exsolution as a means to employ noble metals in minimal quantities. In this study, we scrutinize the phase segregation behavior and ionic environment of palladium incorporated on the B-site of Pr0.5Ba0.5MnO3-δ. The substitution of palladium in the manganese sites induces the creation of oxygen vacancies to accommodate square planar Pd2+. Upon undergoing reduction treatment, a phase transformation occurs, resulting in the formation of the A-site layered double perovskite, PrBaMn1.9Pd0.1O5+δ (L-PBMPd), accompanied by the exsolution of monometallic and bimetallic nanoparticles on its surface. Notably, this study reports, for the first time, the exsolution of metallic manganese in the form of an alloy nanoparticle with a composition of Pd3Mn. The achieved maximum power densities of 0.59 W cm-2 at 800 °C and 0.80 W cm-2 at 850 °C underscore the high performance of L-PBMPd as an anode material in SOFCs. This outstanding performance suggests potential synergistic effects of the Pd3Mn nanoparticle in fuel oxidation, positioning it as a promising alloy for catalytic applications.
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