Electrochemical performance and stability of SrTi0.3Fe0.6Co0.1O3-δ infiltrated La0.8Sr0.2MnO3Zr0.92Y0.16O2-δ oxygen electrodes for intermediate-temperature solid oxide electrochemical cells

Zhang, Shan-Lin; Wang, Hongqian; Lu, Matthew Y.; Li, Cheng-Xin; Li, Chang-Jiu; Barnett, Scott A.

doi:10.1016/j.jpowsour.2019.04.044

Electrochemical performance and stability of SrTi_0.3Fe_0.6Co_0.1O_3-δ infiltrated La_0.8Sr_0.2MnO₃Zr_0.92Y_0.16O_2-δ oxygen electrodes for intermediate-temperature solid oxide electrochemical cells

Journal Article · Tue Apr 16 00:00:00 EDT 2019 · Journal of Power Sources

DOI:https://doi.org/10.1016/j.jpowsour.2019.04.044· OSTI ID:1599353

Zhang, Shan-Lin ^[1]; Wang, Hongqian ^[2]; ^[2]; ^[3]; Li, Chang-Jiu ^[3]; ^[2]

Northwestern Univ., Evanston, IL (United States); Xi'an Jiaotong Univ., Shaanxi (China); Northwestern Univ
Northwestern Univ., Evanston, IL (United States)
Xi'an Jiaotong Univ., Shaanxi (China)

We report that the La_0.8Sr_0.2MnO₃-Zr_0.92Y_0.16O_2-δ (LSM-YSZ) composite is the most widely used oxygen electrode for solid oxide electrochemical cells (SOCs). However, operating temperatures > 700 degrees C are required for good performance since oxygen reactions are limitied to three-phase boundaries (TPBs) because of poor ionic conductivity of LSM. Furthermore, LSM-YSZ electrodes typically delaminate during electrolysis operation leading to cell degradation. One strategy to improve SOCs with LSM-YSZ electrodes is to infiltrate a mixed ionically and electronically conducting (MIEC) material that promotes oxygen exchange. However, infiltrated materials have a nano-scale structure that may not be stable under SOC operating temperatures. Here, we report results on the infiltration of SrTi_0.3Fe_0.6Co_0.1O_3-δ(STFC), a recently reported high performance MIEC, into LSM-YSZ to improve its electrochemical performance and stability at intermediate temperatures. The infiltrated STFC enhances LSM-YSZ and cell performance, typically yielding a decrease in electrode polarization resistance by a factor > 3 times, resulting in an increase in fuel cell maximum power density and electrolysis current density (at 1.3 V) by a factor > 2 times. Perhaps more significantly, the infiltrated electrodes show good performance stability, with suppression of electrode delamination during electrolysis and no evidence of coarsening or segregation induced degradation.

View Accepted Manuscript (DOE)

Research Organization:: Northwestern Univ., Evanston, IL (United States); Northwestern University, Evanston, IL (United States)

Sponsoring Organization:: China Scholarship Council; National Science Foundation (NSF); USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Fuel Cell Technologies Office (EE-3F); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: EE0008079; SC0016965

OSTI ID:: 1599353

Alternate ID(s):: OSTI ID: 1547504
OSTI ID: 1658926
OSTI ID: 2229573

Journal Information:: Journal of Power Sources, Journal Name: Journal of Power Sources Journal Issue: C Vol. 426; ISSN 0378-7753

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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