TY - JOUR
T1 - Microwave irradiation synthesis to obtain La0.7-xPrxCa0.3MnO3 perovskites
T2 - electrical and electrochemical performance
AU - Ferrel-Alvarez, A.C.
AU - Domínguez-Crespo, M.A.
AU - Cong, H.
AU - Torres-Huerta, A.M.
AU - Palma-Ramírez, D.
AU - Irvine, J. T. S.
N1 - Atzin Ferrel is grateful for her grants from CONACYT and SIP- IPN. The authors also appreciate the financial support provided by the Consejo Nacional de Ciencia y Tecnología (CONACYT), México, Comisión de Operación y Fomento de Actividades Académicas del IPN (COFAA), México and Secretaría de Investigación y Posgrado (SIP) of the Instituto Politécnico Nacional (IPN) México through the CB2015–252181, 20201278, 20201279, 20201280, 20202443 and 20200909 projects as well as the SNI-CONACyT.
PY - 2021/1/15
Y1 - 2021/1/15
N2 - La0.7-xPrxCa0.3MnO3 (LPCM)
perovskites previously synthesized by the microwave-assisted method at
4 min and with different stoichiometry (x = 0.35, 0.52 and 0.63) were
evaluated through thermogravimetric analysis (TGA), electrical
conductivity, thermal expansion coefficient (TEC), scanning electron
microscopy (SEM), Brunauer- Emmet- Teller (BET) analysis and
electrochemical impedance spectroscopy (EIS) using yttria stabilized
zirconia (YSZ) as an electrolyte. The results are discussed in terms of
the potential as cathode material to be applied in solid oxide fuel
cells (SOFCs) applications at temperatures from 600 to 800 °C. Results
derived from TGA showed that Pr promotes the uncoupling oxygen and
oxygen vacancies favoring the fuel combusting. Also, TEC analysis
revealed adequate stability between the YSZ electrolyte and the La0.7-xPrxCa0.3MnO3
to avoid cracking or failing, especially with high amount of Pr. The
transition in morphology from irregular to regular shapes improves the
BET and Barret- Joyner- Halenda (BJH) surfaces and promotes the triple
phase boundary (TPB) connectivity. The electrical conductivity
correlated to the availability in oxygen vacancies showed maximum
conductivities in the order of 10−2 S cm−1.
Activation energy (Ea) was found to be reduced with a minimum quantity
of Pr (0.071 eV). EIS results indicate that the oxygen vacancies in the
LPCM/YSZ system were better promoted with the highest amount of
Pr = 0.63 (η = 0.9 V, 800 °C and 0.06 V of amplitude) in comparison with
the minimum, Pr = 0.35 (η = 1.2 V, 800 °C and 0.06 V of amplitude).
AB - La0.7-xPrxCa0.3MnO3 (LPCM)
perovskites previously synthesized by the microwave-assisted method at
4 min and with different stoichiometry (x = 0.35, 0.52 and 0.63) were
evaluated through thermogravimetric analysis (TGA), electrical
conductivity, thermal expansion coefficient (TEC), scanning electron
microscopy (SEM), Brunauer- Emmet- Teller (BET) analysis and
electrochemical impedance spectroscopy (EIS) using yttria stabilized
zirconia (YSZ) as an electrolyte. The results are discussed in terms of
the potential as cathode material to be applied in solid oxide fuel
cells (SOFCs) applications at temperatures from 600 to 800 °C. Results
derived from TGA showed that Pr promotes the uncoupling oxygen and
oxygen vacancies favoring the fuel combusting. Also, TEC analysis
revealed adequate stability between the YSZ electrolyte and the La0.7-xPrxCa0.3MnO3
to avoid cracking or failing, especially with high amount of Pr. The
transition in morphology from irregular to regular shapes improves the
BET and Barret- Joyner- Halenda (BJH) surfaces and promotes the triple
phase boundary (TPB) connectivity. The electrical conductivity
correlated to the availability in oxygen vacancies showed maximum
conductivities in the order of 10−2 S cm−1.
Activation energy (Ea) was found to be reduced with a minimum quantity
of Pr (0.071 eV). EIS results indicate that the oxygen vacancies in the
LPCM/YSZ system were better promoted with the highest amount of
Pr = 0.63 (η = 0.9 V, 800 °C and 0.06 V of amplitude) in comparison with
the minimum, Pr = 0.35 (η = 1.2 V, 800 °C and 0.06 V of amplitude).
KW - Lanthanum manganites
KW - Microwave irradiation synthesis
KW - Electrical conductivity SOFC cathode Materials
KW - Ceramic interconnects
U2 - 10.1016/j.jallcom.2020.156882
DO - 10.1016/j.jallcom.2020.156882
M3 - Article
SN - 0925-8388
VL - 851
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 156882
ER -