Celem pracy jest porównanie d?ugoczasowej stabilno?ci chemicznej spieków kompozytowych BaCe0,85Y0,15O3-? i Ce0,85Y0,15O2-? z czystym BaCe0,85Y0,15O3-?, które poddano starzeniu przez 600 godzin w atmosferze CO2/H2O w tem- peraturze pokojowej oraz w atmosferze N2/H2O w 873 K. Do bada? procesów fizykochemicznych zachodz?cych podczas starzenia w/w próbek wykorzystano metod? termicznej analizy ró?nicowej oraz termograwimetri?, natomiast sk?ad chemiczny gazów uwalnianych z próbek podczas ich ogrzewania analizowano spektrometrem masowym. Wp?yw atmosfer reakcyjnych na sk?ad fazowy i chemiczny oraz mikrostruktur? spieków okre?lono w oparciu o wyniki bada? rentgenograficznych oraz obser- wacji przy pomocy skaningowej mikroskopii elektronowej po??czonej z dyspersj? energii promieniowania rentgenowskiego. Z bada? tych mo?na wnioskowa?, ?e materia?y kompozytowe wykazuj? stabilno?? w badanych warunkach, podczas gdy czysty BaCe0,85Y0,15O3-? jest nietrwa?y w atmosferze CO2/H2O w temperaturze pokojowej.
The goal of this work is to compare the long-term chemical stability of BaCe0,85Y0,15O3-? and Ce0,85Y0,15O2-? bulk composite samples to that of pure BaCe0,85Y0,15O3-? after ageing for 600 hours in CO2/H2O atmosphere at room temperature and N2/H2O atmosphere at 873 K. Differential Thermal Analysis and Thermogravimetry were used to investigate the physic- ochemical processes that took place during the ageing of the afore-mentioned samples and the chemical composition of the gases released from the samples was analyzed by a Mass Spectrometer. The influence of the reactive atmospheres on phase and chemical composition, as well as the microstructure of the bulk samples, was determined from X-ray Diffraction results and Scanning Electron Microscopy observations combined with Energy Dispersion Spectroscopy analysis. From these studies it can be concluded that the composite materials are capable of maintaining stability in the studied conditions, however, pure BaCe0,85Y0,15O3-? is unstable in CO2/H2O atmosphere at room temperature. Keywords: perovskites, solid oxide fuel cell electrolytes, chemical stability, composite materials
Long-Term Chemical Stability of BaCe0,85Y0,15O3-d + Ce0,85Y0,15O2-d Composite Samples at Room Temperature and at 873 K for Use in Dual Pcfc-Sofc Fuel
Viviani M;
2013
Abstract
The goal of this work is to compare the long-term chemical stability of BaCe0,85Y0,15O3-? and Ce0,85Y0,15O2-? bulk composite samples to that of pure BaCe0,85Y0,15O3-? after ageing for 600 hours in CO2/H2O atmosphere at room temperature and N2/H2O atmosphere at 873 K. Differential Thermal Analysis and Thermogravimetry were used to investigate the physic- ochemical processes that took place during the ageing of the afore-mentioned samples and the chemical composition of the gases released from the samples was analyzed by a Mass Spectrometer. The influence of the reactive atmospheres on phase and chemical composition, as well as the microstructure of the bulk samples, was determined from X-ray Diffraction results and Scanning Electron Microscopy observations combined with Energy Dispersion Spectroscopy analysis. From these studies it can be concluded that the composite materials are capable of maintaining stability in the studied conditions, however, pure BaCe0,85Y0,15O3-? is unstable in CO2/H2O atmosphere at room temperature. Keywords: perovskites, solid oxide fuel cell electrolytes, chemical stability, composite materials| File | Dimensione | Formato | |
|---|---|---|---|
|
prod_248145-doc_65838.pdf
accesso aperto
Descrizione: LONG_TERM_CHEMICAL_STABILITY_OF_BaCe0_85Y0_15O3_Ce0_85Y0_15O2_COMPOSITE_SAMPLES_AT_ROOM_TEMPERATURE_AND_AT_873_K_FOR_USE_IN_DUAL_PCFC_SOFC_FUEL_CELLS
Dimensione
1.03 MB
Formato
Adobe PDF
|
1.03 MB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
