resumo
Nano-sized composite La0.6Sr0.4Co0.2Fe0.8O3.8 (LSCF)-Ce0.8Sm0.2O1.9 (SDC) powder was synthesised by one-step microwave self-assisted combustion synthesis and characterized by X-ray diffraction and transmission electron microscopy. Electrochemical performance of composite LSCF-SDC cathode in contact with Ce0.8Gd0.2O1.9 (GDC) solid electrolyte under steady state polarisation was studied employing electrochemical impedance spectroscopy in 3-electrode cell configuration. The evolution of elementary steps of oxygen reduction reaction was analysed under cathodic polarisation in potentiostatic mode (up to 0.8 V) in the temperature range 650-750 degrees C. The composite LSCF-SDC cathode prepared by one-step microwave combustion route demonstrated a lower overall polarisation resistance when compared to literature reports of similar cathodes produced by other synthesis routes.
palavras-chave
OXIDE FUEL-CELLS; SURFACE EXCHANGE KINETICS; OXYGEN REDUCTION; ELECTROCHEMICAL PERFORMANCE; ELECTRICAL-PROPERTIES; TEMPERATURE; DIFFUSION; IMPEDANCE; TRANSPORT; LA0.6SR0.4CO0.2FE0.8O3-DELTA
categoria
Materials Science
autores
Loureiro, FJA; Macedo, DA; Nascimento, RM; Cesario, MR; Grilo, JPF; Yaremchenko, AA; Fagg, DP
nossos autores
Aleksey Yaremchenko
Investigador Principal
Francisco José Almeida Loureiro
Bolseiro de investigação
João Grilo
Investigador JúniorProjectos
agradecimentos
The authors acknowledge CNPq (Brazil, 447797/2014-0 and 311883/2016-8) and FCT (Portugal) for the financial support, grant PD/BDE/114353/2016, IF/01344/2014/CP1222/CT0001, IF/01072/2013/CP1162/CT0001 and projects PTDC CTM-ENE/6319/2014, UID/CTM/50011/2013, UID/EMS/00481/2013, CENTRO-01-0145-FEDER-022083, QREN, FEDER and COMPETE Portugal and the European Union.