TY - JOUR
T1 - Surface modification of La0.6Sr0.4Co0.2Fe0.8O3 cathode by infiltrating A-site deficient non-strontium La0.94Ni0.6Fe0.4O3 perovskite for solid oxide fuel cells
AU - Zhao, Hanwen
AU - Li, Wenlu
AU - Wang, Haojie
AU - Zhou, Juan
AU - Sun, Xiufu
AU - Wang, Erjing
AU - Zhao, Li
AU - Dong, Binghai
AU - Wang, Shimin
PY - 2022
Y1 - 2022
N2 - La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) is a promising cathode for intermediate temperature range, however strontium tends to segregate on the surface of the cathode and reacts with CO2 from atmosphere and Cr from interconnect, which deteriorates its oxygen reduction reaction (ORR) activity. Here, we propose infiltrating stable and active A-site deficient Fe-doped lanthanum nickelate perovskite La1-xNiyFe1-yO3 without Sr element over the LSCF by delicately tailoring the infiltrating amount. It is found that 150 μL La0.94Ni0.6Fe0.4O3(LNF94) infiltrated LSCF (LNF94@LSCF) composite cathode with improved ORR catalytic activity, its symmetrical cell area specific resistance is 0.041 Ω·cm2 and its single cell exhibited 1.08 W cm-2 output power density at 800 ℃. The heterogeneous interface significantly improved the electron conduction and enhanced the dissociation of oxygen molecules which has been verified by the energy band alignment of LSCF and LNF94. Moreover, the core-shell LNF94@LSCF composite cathode showed excellent long-term tolerance to CO2 and Cr atmosphere.
AB - La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) is a promising cathode for intermediate temperature range, however strontium tends to segregate on the surface of the cathode and reacts with CO2 from atmosphere and Cr from interconnect, which deteriorates its oxygen reduction reaction (ORR) activity. Here, we propose infiltrating stable and active A-site deficient Fe-doped lanthanum nickelate perovskite La1-xNiyFe1-yO3 without Sr element over the LSCF by delicately tailoring the infiltrating amount. It is found that 150 μL La0.94Ni0.6Fe0.4O3(LNF94) infiltrated LSCF (LNF94@LSCF) composite cathode with improved ORR catalytic activity, its symmetrical cell area specific resistance is 0.041 Ω·cm2 and its single cell exhibited 1.08 W cm-2 output power density at 800 ℃. The heterogeneous interface significantly improved the electron conduction and enhanced the dissociation of oxygen molecules which has been verified by the energy band alignment of LSCF and LNF94. Moreover, the core-shell LNF94@LSCF composite cathode showed excellent long-term tolerance to CO2 and Cr atmosphere.
KW - Infiltration
KW - La0.94Ni0.6Fe0.4O3
KW - La0.6Sr0.4Co0.2Fe0.8O3
KW - Solid oxide fuel cells
U2 - 10.1016/j.apsusc.2021.151382
DO - 10.1016/j.apsusc.2021.151382
M3 - Journal article
SN - 0169-4332
VL - 572
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 151382
ER -