A high performance solid oxide fuel cells operating at intermediate temperature with a modified interface between cathode and electrolyte

In Situ Formation of Er0.4Bi1.6O3 Protective Layer at Cobaltite Cathode/Y2O3–ZrO2 Electrolyte Interface under Solid Oxide Fuel Cell Operation Conditions

“…The stable interface is clearly due to the redistribution and diffusion of the ESB phase, forming a bismuth oxide layer at the cathode/electrolyte interface under the influence of cathodic polarization, as shown in Figure . The migration of bismuth oxide phase was also reported by others. , Lee et al prepared the ESB-LSM composite cathode by a conjugated reverse-strike co-precipitation and glycine nitrate combustion method and observed the formation of a continuous nanoscale ESB layer (∼50 nm) at the electrode/YSZ electrolyte interface after polarization test. The formation of the thin ESB layer was attributed to its high wettability and mobility due to the low melting temperature of bismuth oxide (∼827 °C).…”

“…The formation of the thin ESB layer was attributed to its high wettability and mobility due to the low melting temperature of bismuth oxide (∼827 °C). Fan et al . also observed a dense Bi 2 O 3 –LSCF film at the electrode/electrolyte interface on 1 mol % Bi 2 O 3 –LSCF composite electrode after polarization and proposed that the addition of Bi 2 O 3 into LSCF promoted the formation of eutectic liquid, which flows down to the electrolyte surface to form a dense layer.…”

“…The formation of thin ESB layer was attributed to its high wettability and mobility due to the low melting temperature of bismuth oxide (~827 o C). Fan et al 79 also observed a dense Bi2O3-LSCF film at the electrode/electrolyte interface on 1 mol% Bi2O3-LSCF composite electrode after polarization and proposed that the addition of Bi2O3 into LSCF promoted the formation of eutectic liquid, which flows down to the electrolyte surface to form a dense layer. In the present study, the HAADF and STEM-EDS element mapping of the cathode/electrolyte interface of anode supported YSZ electrolyte cells with ESB-LSCFNb cathodes before and after polarization evidently demonstrates that ESB is separated from the mixed ESB-LSCFNb phase and migrates to the electrolyte surface, forming an interlayer at the electrode/YSZ electrolyte interface.…”

“…The migration of bismuth oxide phase was also reported by others. [78][79] Lee et al 78 prepared the ESB-LSM composite cathode by a conjugated reverse-strike co-precipitation and glycine-nitrate combustion method and observed the formation of a continuous nano-scale ESB layer (~50 nm) at the electrode/YSZ electrolyte interface after polarization test. The formation of thin ESB layer was attributed to its high wettability and mobility due to the low melting temperature of bismuth oxide (~827 o C).…”

Síntese, processamento e caracterização de cátodo para aplicação em células a combustível de óxido sólido de temperatura intermediária

“…Em virtude dos motivos discutidos, a atenção está direcionada para a seleção e obtenção de materiais cerâmicos que possam ser utilizados como componentes na Célula a Combustível de Óxido Sólido de Temperatura Intermediária (Intermediate Temperature Solid Oxide Fuel Cell -ITSOFC), que opera atualmente entre 500 e 700ºC (27,39) .…”