5 documents found, page 1 of 1
Assessment of manganese- and praseodymium-substituted 5YSZ as interlayer materi...
Yaremchenko, Aleksey; Natoli, Alejandro; Vieira, Miguel; Frade, JorgeLong-term degradation remains a major obstacle to the introduction of SOEC technology as a practical hydrogen production system. A specific degradation mechanism in SOECs is related to electrolyte deterioration and delamination phenomena at or near electrolyte/anode interface. The electrochemical studies of reversible solid oxide fuel/electrolysis cells (rSOCs) operation revealed that the degradation occurring ...
Mixed ionic-electronic conductivity, redox behavior and thermochemical expansio...
Natoli, Alejandro; Arias-Serrano, Blanca I.; Rodríguez-Castellón, Enrique; Żurawska, Agnieszka; Frade, Jorge R.; Yaremchenko, Aleksey A.Manganese-substituted 5 mol.% yttria-stabilized zirconia (5YSZ) was explored as a prospective material for protective interlayers between electrolyte and oxygen electrodes in reversible solid oxide fuel/electrolysis cells. [(ZrO2)0.95(Y2O3)0.05]1-x[MnOy]x (x = 0.05, 0.10 and 0.15) ceramics with cubic fluorite structure were sintered in air at 1600 °C. The characterization included X-ray diffraction (XRD), scann...
Impact of praseodymia additions and firing conditions on structural and electri...
Natoli, Alejandro; Frade, Jorge R.; Bamburov, Aleksandr; Żurawska, Agnieszka; Yaremchenko, AlekseyCeramics samples with the nominal composition [(ZrO2)0.95(Y2O3)0.05]1-x[PrOy]x and praseodymia contents of x = 0.05–0.15 were prepared by the direct firing of compacted 5YSZ + PrOy mixtures at 1450–1550 C for 1–9 h and characterized for prospective applicability in reversible solid oxide cells. XRD and SEM/EDS analysis revealed that the dissolution of praseodymium oxide in 5YSZ occurs via the formation of pyroc...
Structural Design of 5 mol.% Yttria Partially Stabilized Zirconia (5Y-PSZ) by A...
Natoli, Alejandro; Yaremchenko, Aleksey; Frade, Jorge R.In this study, 5Y-PSZ-based ceramics with 15 mol.% of manganese oxide were obtained from PSZ + MnO2 powders mixtures by pressing and direct firing. The resulting materials show a stable cubic fluorite structure with only minor traces of segregated manganese oxides and relative density from 90% to 98%. The linear thermal expansion coeffcient is in the order of 10^-5 K^-1 at 500 K and increases gradually with tem...
Characterization of ZrO2-Y2O3-MnO2 solid solutions as components for reversible...
Natoli, Alejandro; Yaremchenko, Aleksey; Frade, JorgeLong-term degradation remains the main issue for the viability of reversible solid oxide fuel/electrolysis cell (SOFC/SOEC) technology as practical hydrogen production and energy storage systems. While some lifetime-limiting factors are common in both regimes, the major specific degradation mechanism in SOEC regime relates to the delamination phenomena. The experimental and modelling results suggest that high o...