Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10637/14774

Thermochemical Energy Storage Using the Phase Transitions Brownmillerite -2H Perovskite - Cubic Perovskite in the CaxSr1–xCoO3−δ (x = 0 and 0.5) System


Vista previa

Ver/Abrir:
 Thermochemical_Azcondo_et_al_2021.pdf

1,4 MB
Adobe PDF
Título : Thermochemical Energy Storage Using the Phase Transitions Brownmillerite -2H Perovskite - Cubic Perovskite in the CaxSr1–xCoO3−δ (x = 0 and 0.5) System
Autor : Azcondo Sánchez, María Teresa
Orfila, María
Linares, María
Molina, Raúl
Marugán, Javier
Amador Elizondo, Ulises Julio
Boulahya, Khalid
Botas, Juan Ángel
Sanz, Raúl
Materias: Thermochemical energy storagePerovskiteBrownmilleriteCyclabilityThermal hysteresisStructural transitionRedox processes
Editorial : American Chemical Society
Citación : Víctor Zapata-Ramírez, Paula Rosendo-Santos, Ulises Amador, Clemens Ritter, Glenn C. Mather, Domingo Pérez-Coll, Optimisation of high-performance, cobalt-free SrFe1-xMoxO3-y cathodes for solid oxide fuel cells prepared by spray pyrolysis, Renewable Energy, 2022 185, 1167-1176. DOI: 10.1016/j.renene.2021.12.121
Resumen : The oxides Ca0.5Sr0.5CoO3-δ and SrCoO3-δ, which present perovskite or perovskite-related phases in different temperature domains, have been tested as materials for thermochemical energy storage. The first one, Ca0.5Sr0.5CoO3-δ, experiences a reversible phase transition upon consecutive cycles under air flow at a maximum operating temperature of 1196 K. Unfortunately, the heat stored in this process, associated to an oxygen loss/gain and a structural phase transition, is very small hindering its use for thermochemical heat storage. The as-prepared oxide SrCoO3-δ, which displays a brownmillerite structure like the Ca-containing compound, in the first heating step irreversibly segregates some Co3O4 at 823 K to yield a 2H hexagonal-perovskite. This phase reversibly transforms at 1073 K into a cubic-perovskite. These 2H⇄C transition occurs from the second to, at least, thirty cycles. The average absorbed and released heat are ~104.1±0.06 J/g and ~68.8±1.8 J/g, respectively, and therefore SrCoO3-δ presents a high exo/endo ratio. The exergy efficiency is, on average for the 30 cycles performed, as high as 63.9±1.2%. The mechanism of the phase 2H⇄C transition of SrCoO3-δ explains the good performance of this material for thermochemical energy storage.
URI : http://hdl.handle.net/10637/14774
Derechos: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
ISSN : 2574-0962
Fecha de publicación : 9-ago-2021
Centro : Universidad San Pablo-CEU
Aparece en las colecciones: Facultad de Farmacia





Los ítems de DSpace están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.