Surface enhanced performance of La0.6Sr0.4Co0.2Fe0.8O3-δ cathodes by infiltration Pr-Ni-Mn-O progress

Shi, Yongjing; Wen, Yeting; Huang, Kevin; Xiong, Xiaolei; Wang, Jie; Liu, Meilin; Ding, Dong; Chen, Yu; Liu, Tong

doi:10.1016/j.jallcom.2021.163337

Title: Surface enhanced performance of La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ cathodes by infiltration Pr-Ni-Mn-O progress

Journal Article · 22 December 2021 · Journal of Alloys and Compounds

DOI: https://doi.org/10.1016/j.jallcom.2021.163337 · OSTI ID:1977240

Shi, Yongjing ^[1]; Wen, Yeting ^[2]; Huang, Kevin ^[2]; Xiong, Xiaolei ^[2]; Wang, Jie ^[3]; Liu, Meilin ^[4]; Ding, Dong ^[4]; Chen, Yu ^[4]; Liu, Tong ^[5]

Chongqing University of Science and Technology (China); Univ. of South Carolina, Columbia, SC (United States); Georgia Institute of Technology, Atlanta, GA (United States); OSTI
Univ. of South Carolina, Columbia, SC (United States)
Univ. of Science and Technology, Beijing (China)
Georgia Institute of Technology, Atlanta, GA (United States)
Wuhan Univ. (China)

Herein the present study reports the enhancement of electrochemical oxygen reduction activity of porous La_0.6Sr_0.4Co_0.2Fe_0.8O_3–δ (LSCF) cathodes by coating a thin film of Pr-Ni-Mn oxide (PNM5) using a multi-step infiltration process. XRD examination reveals that PNM5 mainly contains a multiphase mixture of Pr₆O₁₁, PrNiO₃, MnO and NiO. SEM morphology shows a thin PNM5 film and small particles are formed on the surface of LSCF backbone particles. Impedance spectrum analysis indicates that PNM5 infiltrated LSCF exhibits dramatically reduced polarization resistance (R_p), reaching R_p of 0.244 Ω cm² at 973 K, which is one-half of the baseline LSCF cathode. The activation energy of LSCF cathodes infiltrated with PNM5 is 1.45 eV, slightly lower than the baseline LSCF cathode (1.77 eV). Distribution of relaxation time (DRT) function analysis shows PNM5 infiltration layer significantly promotes the oxygen reduction reaction (ORR) of cathode surface. With the increase in firing temperature, the total resistance increases and R_p changes from ion transport to oxygen reduction reaction. Degradation rate of the PNM5-infiltrated LSCF is also lower, 0.02168% vs 0.07093% for the baseline LSCF over a 200-h period. A single cell testing indicated that the peak power density of the PNM5-infiltrated cell was increased by 140.66%. Overall, PNM5 could be a potential catalyst for boosting the performance of a commercial LSCF cathode for solid oxide fuel cells (SOFC).

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Research Organization:: Univ. of South Carolina, Columbia, SC (United States)

Sponsoring Organization:: USDOE; USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AR0000492

OSTI ID:: 1977240

Journal Information:: Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Journal Issue: C Vol. 902; ISSN 0925-8388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Surface enhanced performance of La0.6Sr0.4Co0.2Fe0.8O3-δ cathodes by infiltration Pr-Ni-Mn-O progress

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Title: Surface enhanced performance of La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ cathodes by infiltration Pr-Ni-Mn-O progress