Estudio de la familia (la, sr)n+1 (mn, ni) no3n+-1 de estructura ruddlesden-popper (n=1 y 2) como material de ánodo para celdas de combustible sofc
Las celdas de combustible son dispositivos electroquímicos para la conversión directa de energía química almacenada en combustibles en energía eléctrica. Pueden ser clasificadas de acuerdo a su temperatura de operación, la cual dicta el tipo de electrolito utilizado. En el rango de temperatura entre...
- Autores:
-
Florez Yepes, Silvia Juliana
Palencia Ruiz, Santiago
- Tipo de recurso:
- http://purl.org/coar/version/c_b1a7d7d4d402bcce
- Fecha de publicación:
- 2016
- Institución:
- Universidad Industrial de Santander
- Repositorio:
- Repositorio UIS
- Idioma:
- spa
- OAI Identifier:
- oai:noesis.uis.edu.co:20.500.14071/34313
- Palabra clave:
- Sofc
Manganitas
Estructura Ruddlesden Popper N=1 Y 2
Ánodo Y Exsolución De Níquel.
Fuel cells are electrochemical devices for direct conversion of chemical energy stored in fuels into electric energy. They can be classified according to the temperature of operation
which dictates the kind of electrolyte used. In the temperature range between 600 and 1000ºC
it can be found using solid oxide electrolyte
fuel cells known as SOFC (Solid Oxide Fuel Cell). This work focus on this kind of cells
for which there was prepared by Sol-Gel route
composites of Ruddlesden-Popper structure n=1 Sr2-xLaxMn1-yNiyO (x=0.6-0.75 y y=0.1
0.2) and n=2 La1.5Sr1.5Mn1.5Ni0.5O. The study of these phases under oxidizing conditions confirms their stability at high temperatures (up to T=1200ºC) by ATG analysis
and an X Ray thermodiffraction study allowed to determinate that thermal expansion coefficients (TEC) are in good match with CGO electrolyte. On the other hand
materials characterization in diluted hydrogen (H2) showed instability RP n=1 phases
whereas La1.5Sr1.5Mn1.5Ni0.5O phase exhibited the formation of RP n=1 phase besides exsolution of nickel nanoparticles over the surface (confirmed by Transmission Electronic Microscopy). Finally
under reducing environment
the same phase displayed good chemical compatibility with CGO electrolyte. This performance in general of La1.5Sr1.5Mn1.5Ni0.5O7 let the phase be considered as a promising material to be used as electrode on SOFC.
- Rights
- License
- Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)