info:eu-repo/semantics/article
In-situ Ni exsolution from NiTiO3 as potential anode for solid oxide fuel cells
Fecha
2020-09Registro en:
Toscani, Lucía María; Volpe Giangiordano, María Florencia; Nichio, Nora Nancy; Pompeo, Francisco; Larrondo, Susana Adelina; In-situ Ni exsolution from NiTiO3 as potential anode for solid oxide fuel cells; Pergamon-Elsevier Science Ltd; International Journal of Hydrogen Energy; 45; 43; 9-2020; 1-11
0360-3199
CONICET Digital
CONICET
Autor
Toscani, Lucía María
Volpe Giangiordano, María Florencia
Nichio, Nora Nancy
Pompeo, Francisco
Larrondo, Susana Adelina
Resumen
Sample NiTiO3 (NTO) is prepared by the molten salts synthesis route as a potential anode material for solid oxide fuel cell (SOFC) applications. An additional sample impregnated with 5 mol%Ni (N-NTO) is also presented. Structural characterization reveal a pure NiTiO3 phase upon calcination at 850 °C and 1000 °C. Redox characterization by temperature programmed reduction tests indicate the transition from NiTiO3 to Ni/TiO2 at ca. 700 °C. Ni nanoparticles (ca. 26 nm) are exsolved in-situ from the structure after a reducing treatment at 850 °C. Catalytic activity tests for partial oxidation of methane performed in a fixed bed reactor reveal excellent values of activity and selectivity due to the highly dispersed Ni nanoparticles in the support surface. Time-on-stream behavior during 100 h operation in reaction conditions for sample N-NTO yield a stable CH4 conversion. Electrolyte supported symmetrical cells are prepared with both materials achieving excellent polarization resistance of 0.023 Ω cm2 in 7%H2/N2 atmosphere at 750 °C with sample N-NTO. The maximum power density achieved is of 273 mW cm−2 at 800 °C with a commercial Pt ink used as a reference cathode, indicating further improvement of the system can be achieved and positioning the N-NTO material as a promising SOFC anode material.