Performance of Cathode Current Collection Layer of Planar Solid Oxide Fuel Cell Formed Using Slurry Coating Technique

Taniguchi, Shunsuke; Kadowaki, Masataka; Yasuo, Takashi; Akiyama, Yukinori; Miyake, Yasuo; Nishio, Koji

doi:10.5796/electrochemistry.68.337

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“…(Cr-Ba-O (nuclei) + CrO 3 → Cr 2 O 3 [5] Cr 2 O 3 + CrO 3 + BaO → BaCrO 4 [6] The volatile Cr gaseous species would react with segregated Sr and/or Ba, forming Cr-Sr-O and/or Cr-Ba-O nuclei and subsequent crystallization and grain growth of Cr 2 O 3 and BaCrO 4 /SrCrO 4 solid phases. The nuclei-induced crystallization and grain growth of Cr deposits is also supported by the direct observation of Mn-rich nuclei within the Cr particles.…”

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confidence: 99%

“…The accumulation of Cr deposits eventually leads to a serious polarization loss of the cathode and performance degradation of the cell. [6][7][8][9][10][11][12] The chromium deposition and poisoning is a critical issue for the application of metallic interconnect materials in IT-SOFCs. 10,13 Numerous studies have shown that the occurrence of Cr deposition and poisoning phenomena depends on the nature of electrode materials.…”

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Effect of Strontium Content on Chromium Deposition and Poisoning in Ba_1−xSr_xCo_0.8Fe_0.2O_3−δ(0.3 ≤x ≤0.7) Cathodes of Solid Oxide Fuel Cells

Kim

Chen

Bae

2011

J. Electrochem. Soc.

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The effect of strontium content on Cr deposition and poisoning in barium strontium cobalt ferrite electrodes, Ba 1−x Sr x Co 0.8 Fe 0.2 O 3−δ (BSCF, 0.3 ≤ x ≤ 0.7), was investigated at 900 • C for 20 h with a cathodic polarization of 200 mA cm −2 . In contrast to the superb and stable electrochemical performance of the BSCF electrodes without interconnects, electrode polarization resistance and overpotential (R E and η) were found to increase for the O 2 reduction reaction on BSCF electrodes in the presence of Fe-Cr metallic interconnects. Most important, the increase in R E and η values, R E and η measured after polarized at 200 mA cm −2 for 20 h, increased significantly as the Sr content of the BSCF electrodes was increased, indicating that the Sr content in BSCF electrodes is a governing factor in Cr poisoning. Scanning electron microscopy (SEM) analysis of the BSCF electrodes after the Cr poisoning test at 900 • C for 20 h revealed the presence of Cr deposits on the cathode surface. The magnitude of Cr deposits on the electrode surface under the rib of the interconnect is significantly higher than that under the channel of the interconnect. The results in this study indicate that Sr and/or Ba segregation plays an important role in the Cr deposition and poisoning for the O 2 reduction on BSCF cathodes, which is closely related to the Ba/Sr ratio of the cathode.

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Effect of Strontium Content on Chromium Deposition and Poisoning in Ba_1−xSr_xCo_0.8Fe_0.2O_3−δ(0.3 ≤x ≤0.7) Cathodes of Solid Oxide Fuel Cells

Kim

Chen

Bae

2011

J. Electrochem. Soc.

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Performance of Cathode Current Collection Layer of Planar Solid Oxide Fuel Cell Formed Using Slurry Coating Technique

Cited by 1 publication

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Effect of Strontium Content on Chromium Deposition and Poisoning in Ba_1−xSr_xCo_0.8Fe_0.2O_3−δ(0.3 ≤x ≤0.7) Cathodes of Solid Oxide Fuel Cells

Effect of Strontium Content on Chromium Deposition and Poisoning in Ba_1−xSr_xCo_0.8Fe_0.2O_3−δ(0.3 ≤x ≤0.7) Cathodes of Solid Oxide Fuel Cells

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Performance of Cathode Current Collection Layer of Planar Solid Oxide Fuel Cell Formed Using Slurry Coating Technique

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Effect of Strontium Content on Chromium Deposition and Poisoning in Ba1−xSrxCo0.8Fe0.2O3−δ(0.3 ≤x ≤0.7) Cathodes of Solid Oxide Fuel Cells

Effect of Strontium Content on Chromium Deposition and Poisoning in Ba1−xSrxCo0.8Fe0.2O3−δ(0.3 ≤x ≤0.7) Cathodes of Solid Oxide Fuel Cells

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Effect of Strontium Content on Chromium Deposition and Poisoning in Ba_1−xSr_xCo_0.8Fe_0.2O_3−δ(0.3 ≤x ≤0.7) Cathodes of Solid Oxide Fuel Cells

Effect of Strontium Content on Chromium Deposition and Poisoning in Ba_1−xSr_xCo_0.8Fe_0.2O_3−δ(0.3 ≤x ≤0.7) Cathodes of Solid Oxide Fuel Cells