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
- Northwestern Univ., Evanston, IL (United States); Xi'an Jiaotong Univ., Shaanxi (China)
- Northwestern Univ., Evanston, IL (United States)
- Xi'an Jiaotong Univ., Shaanxi (China)
We report that the La0.8Sr0.2MnO3-Zr0.92Y0.16O2-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 SrTi0.3Fe0.6Co0.1O3-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.
- Research Organization:
- Northwestern Univ., Evanston, IL (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Hydrogen Fuel Cell Technologies Office (HFTO); National Science Foundation (NSF); China Scholarship Council; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
- Grant/Contract Number:
- SC0016965; EE0008079; DMR-1506925; DMR-1545907; DMR-1121262; NNCI-1542205; 201606285002; 51602248; EE450008079
- OSTI ID:
- 1599353
- Alternate ID(s):
- OSTI ID: 1547504; OSTI ID: 1658926; OSTI ID: 2229573
- Journal Information:
- Journal of Power Sources, Vol. 426, Issue C; ISSN 0378-7753
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Positive Effect of Incorporating Er 0.4 Bi 1.6 O 3 on the Performance and Stability of La 2 NiO 4+δ Cathode
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journal | January 2019 |
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