THENNER SILVA RODRIGUES
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Artigo IPEN-doc 26691 Lowering the sintering temperature of a SOFC by morphology control of the electrolyte powder2019 - MACHADO, M.; MORAES, L.P.R.; RODRIGUES, L.N.; RODRIGUES, T.S.; FONSECA, F.C.Solid oxide fuel cells are fabricated by two-step sintering at low temperature by controlling the morphology of the gadolinium-doped cerium oxide (GDC) electrolyte powders. The GDC electrolyte was synthesized by a hydrothermal route to obtain highly reactive nanorods that can fully densify at temperatures around 1150 °C. The developed system consists of the GDC electrolyte support, lanthanum strontium cobalt ferrite (LSCF) cathode and Ni/GDC anode. The electrolyte support was prepared by uniaxial die pressing and sintered at 1150 °C, and fuel cells were obtained by co-sintering electrode layers at the same temperature. The performance of the cell was evaluated in hydrogen at intermediate temperatures (IT). The experimental results indicate that high-performance IT-SOFC can be obtained at low sintering temperatures by controlling the morphology of electrolyte powder.Artigo IPEN-doc 25839 Tuning diffusion paths in shaped ceria nanocrystals2019 - ESPOSITO, VINCENZO; KABIR, AHSANUL; ROSA, MASSIMO; NONG, NGO V.; RODRIGUES, THENNER S.; RODRIGUES, LAYS N.; MACHADO, MARINA F.S.; MORAES, LETICIA P.R.; MARANI, DEBORA; FONSECA, FABIO C.Mass diffusion controls material structuring from the atomic to the macro-scale defining properties and functionalities. We show here that surface energy in Ce0.9Gd0.1O3-d shaped nanocrystals, i.e. nanocubes, nanorods and spherical nanoparticles, can control solid state diffusion mechanisms over a long range, leading to extreme microstructural diversity.