Highly chromium contaminant tolerant BaO infiltrated La0.6Sr0.4Co0.2Fe0.8O3−δ cathodes for solid oxide fuel cells

Chen, Kongfa; Ai, Na; O’Donnell, Kane M.; Jiang, San Ping

doi:10.1039/c4cp04172k

Cited by 62 publications

(41 citation statements)

References 27 publications

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“…This is in general consistent with the reported formation of BaCrO 4 , CoCr 2 O 4 , CrNdO 3 , and Cr 2 O 3 phases after the heat-treatment of NdBaCo 2 O 5+d electrode in contact with Cr pellet at 800 C for 2h [17]. The formation of less conductive phases like BaCrO 4 [21] and the decomposition of SBCO are detrimental to the electrochemical activity of SBCO cathode, as evidenced by the significant increase in both h and R p (Fig 1).…”

Section: Methodssupporting

confidence: 90%

Performance degradation of SmBaCo2O5+δ cathode induced by chromium deposition for solid oxide fuel cells

Wei

Chen

Wang

et al. 2015

Electrochimica Acta

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Section: Methodssupporting

confidence: 90%

Performance degradation of SmBaCo2O5+δ cathode induced by chromium deposition for solid oxide fuel cells

Wei

Chen

Wang

et al. 2015

Electrochimica Acta

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“…Instead of SrCrO 4 , BaCrO 4 phase is detected. BaCrO 4 is reported to be more stable compared to SrCrO 4 [33]. Therefore, the Cr deposition (CrO 3 , Cr 2 O 3 ) on the BSCF takes place by interacting with Ba 2+ rather than with Sr 2+ with the presence of BaO.…”

Section: Microstructuresmentioning

confidence: 93%

“…Our previous work has also demonstrated that these large particles are SrCrO 4 and they mainly reside on the surface of the cathode [31,32]. The formation of the poorly conductive SrCrO 4 (1.8 Â 10 À5 and 1.8 Â 10 À4 SÁcm À1 at 700 C and 800 C respectively [33]) increases the electrode ohmic resistance by blocking the electrical conductivity path. Also, SrCrO 4 formation extracts Sr species from the LSCF lattice, leading to Sr deficiency at the A-site.…”

Section: Microstructuresmentioning

confidence: 95%

“…Moreover, the extraction of the Ba species from the BSCF lattice leads to Ba deficiency at the A-site and changes its stoichiometry, leading to the cathode performance degradation. The electrical conductivity of BaCrO 4 has been reported to be 4.5 Â 10 À3 SÁcm À1 at 800 C, which is almost 25 times higher than that of SrCrO 4 [33]. Fig.…”

Section: Microstructuresmentioning

confidence: 96%

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Perovskite-type La0.6Sr0.4Co0.2Fe0.8O3, Ba0.5Sr0.5Co0.2Fe0.8O3, and Sm0.5Sr0.5Co0.2Fe0.8O3 cathode materials and their chromium poisoning for solid oxide fuel cells

Shen

2016

Electrochimica Acta

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A B S T R A C TIn the pursuit for solid oxide fuel cell (SOFC) cathode materials that can operate over a wide temperature range, especially at low temperatures such as 600 C, perovskite structure materials La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF), Ba 0.5 Sr 0.5 Co 0.2 Fe 0.8 O 3 (BSCF), and Sm 0.5 Sr 0.5 Co 0.2 Fe 0.8 O 3 (SSCF) are studied. Their electrochemical performance is compared by electrochemical impedance spectroscopy (EIS) at 600 C, 700 C and 800 C for 100 hrs through an AISI 441 interconnect/cathode/yttria-stabilized zirconia (YSZ) electrolyte half-cell structure. The BSCF cathode has the smallest polarization resistance at 600 C, closely followed by the SSCF cathode; the LSCF cathode has the smallest polarization resistance working at 700 C; the SSCF cathode has the smallest polarization resistance working at 800 C, closely followed by the LSCF cathode. From 600-800 C, SrCrO 4 phase forms on the SSCF cathodes near the interconnect while BaCrO 4 phase forms on the BSCF cathodes near the interconnect. For the LSCF cathodes, however, SrCrO 4 phase is only detected at 700 C and 800 C. Cr species diffusion to and poisoning of the cathodes do not directly correlate with the half-cell performance. Lattice constant, stoichiometry, particle size, Cr deposition, and working temperature are important factors to consider.

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“…No SrCrO 4 peaks are detected and the SSCF cathode is stable after 100 hrs of the thermal treatment.This further proves that the Co 0.8 Fe 0.2 oxide coating is effective in inhibiting the Cr diffusion and evaporation. SrCrO 4 phase is a poor electrical conductor (1.8×10 -5 and 1.8×10 -4 S cm -1 at 700°C and 800°C respectively [41]). If it forms on the cathode, the SSCF cathode ohmic resistance will eventually increase.…”

Section: Interconnect Coating Effects On the Sscf Cathodementioning

confidence: 99%

CoxFe1-x oxide coatings on metallic interconnects for solid oxide fuel cells

Shen

2016

Journal of Power Sources

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In order to improve the performance of Cr-containing steel as an interconnect material for solid oxide fuel cells, CoFe alloy coatings with Co:Fe ratios of 9:1, 8:2, 7:3, 6:4, and 5:5 are deposited by electrodeposition and then oxidized to Co x Fe 1-x oxide coatings with a thickness of ~6 µm as protective layers on the interconnect. The area specific resistance ofthe coated interconnect increases with the Fe content. Higher Co content oxide coatings are more effective in limiting the growth ofthe chromia scale while all coatingsare effective in inhibiting Cr diffusion and evaporation.With the Co 0.8 Fe 0.2 oxide coated interconnect, the electrochemical performance of the Sm 0.5 Sr 0.5 Co 0.2 Fe 0.8 O 3 cathode is improved. Only 1.54 atomic percentage of Cr is detected on the surface of the Sm 0.5 Sr 0.5 Co 0.2 Fe 0.8 O 3 cathode while no Cr is detected 0.66 µm or more into the cathode. Co x Fe 1-x oxide coatings are promising candidates for solid oxide fuel cellinterconnects with the advantage of using existing cathode species for compatibility and performance enhancement.

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Highly chromium contaminant tolerant BaO infiltrated La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ cathodes for solid oxide fuel cells

Cited by 62 publications

References 27 publications

Performance degradation of SmBaCo2O5+δ cathode induced by chromium deposition for solid oxide fuel cells

Performance degradation of SmBaCo2O5+δ cathode induced by chromium deposition for solid oxide fuel cells

Perovskite-type La0.6Sr0.4Co0.2Fe0.8O3, Ba0.5Sr0.5Co0.2Fe0.8O3, and Sm0.5Sr0.5Co0.2Fe0.8O3 cathode materials and their chromium poisoning for solid oxide fuel cells

CoxFe1-x oxide coatings on metallic interconnects for solid oxide fuel cells

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