SrZrO3 Formation at the Interlayer/Electrolyte Interface during (La1-xSrx)1-δCo1-yFeyO3 Cathode Sintering

Lu, Zigui; Darvish, Shadi; Hardy, John; Templeton, Jared; Stevenson, Jeffry; Zhong, Yu

doi:10.1149/2.0141710jes

Title: SrZrO₃ Formation at the Interlayer/Electrolyte Interface during (La_1-xSr_x)_1-δCo_1-yFe_yO₃ Cathode Sintering

Journal Article · Wed Jul 19 00:00:00 EDT 2017 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/2.0141710jes· OSTI ID:1390433

Lu, Zigui ^[1]; Darvish, Shadi ^[2]; Hardy, John ^[1]; Templeton, Jared ^[1]; Stevenson, Jeffry ^[1]; Zhong, Yu ^[3]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Florida International Univ., Miami, FL (United States)
Florida International Univ., Miami, FL (United States); Worcester Polytechnic Institute, Worcester, MA (United States)

This work probes the formation of SrZrO₃ at the SDC/YSZ interface (Sm doped ceria, SDC; Y stabilized zirconia, YSZ) during (La_1-xSr_x)_1-δCo1_-yFe_yO₃ (LSCF) cathode sintering. SEM/EDS and grazing incidence X-ray diffraction results of annealed LSCF and YSZ samples reveal that even without physical contact between LSCF and YSZ, SrZrO₃ was formed on the surface of YSZ, preferentially at the grain boundaries. It was suspected that the SrZrO₃ formation is due to the Sr-containing gas species diffused through the pores of the SDC layer and reacted with the YSZ electrolyte. Computational thermodynamics was adopted to predict the gas species formed in air during sintering by using the La-Sr-Co-Fe-O-H thermodynamic database. Sr(OH)₂ is identified as the dominant Sr-containing gas species under the experimental conditions. In addition, it was found that A-site deficiency in LSCF could effectively suppress the SrZrO₃ formation while a dense and pore-free SDC interlayer is required to totally block the SrZrO₃ formation. As a result, cell performance was significantly improved for a cell with a dense SDC interlayer fabricated by pulsed laser deposition, due to elimination of SrZrO₃ formation and therefore reduced interfacial resistance.

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Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1390433

Report Number(s):: PNNL-SA-127510; AA6040000

Journal Information:: Journal of the Electrochemical Society, Vol. 164, Issue 10; ISSN 0013-4651

Publisher:: The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 33 works

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Thermodynamic and Experimental Evaluation of La1−xSrxMnO3±δ Cathode in Presence of Cr-Containing Humidified Air Darvish, Shadi; Hu, Boxun; Singh, Prabhakar JOM, Vol. 71, Issue 11 https://doi.org/10.1007/s11837-018-3169-5	journal	October 2018
Nature and Functionality of La _0.58 Sr _0.4 Co _0.2 Fe _0.8 O _3-δ / Gd _0.2 Ce _0.8 O _2-δ / Y _0.16 Zr _0.84 O _2-δ Interfaces in SOFCs Szász, Julian; Wankmüller, Florian; Wilde, Virginia Journal of The Electrochemical Society, Vol. 165, Issue 10 https://doi.org/10.1149/2.0031811jes	journal	January 2018
Mechanism of SrZrO ₃ Formation at GDC/YSZ Interface of SOFC Cathode Chou, Jyh-Tyng; Inoue, Yuko; Kawabata, Tsutomu Journal of The Electrochemical Society, Vol. 165, Issue 11 https://doi.org/10.1149/2.0551811jes	journal	January 2018
Evaluation of La _0.57 Sr _0.38 Co _0.2 Fe _0.8 O _3-δ Electrode Performance Degradation Based on Three-Dimensional Microstructure Reconstruction and Electrochemical Simulation Shimura, T.; He, A.; Shikazono, N. Journal of The Electrochemical Society, Vol. 166, Issue 12 https://doi.org/10.1149/2.1091912jes	journal	January 2019

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Title: SrZrO3 Formation at the Interlayer/Electrolyte Interface during (La1-xSrx)1-δCo1-yFeyO3 Cathode Sintering

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Title: SrZrO₃ Formation at the Interlayer/Electrolyte Interface during (La_1-xSr_x)_1-δCo_1-yFe_yO₃ Cathode Sintering