Sulfur Deposition and Poisoning of La0.6Sr0.4Co0.2Fe0.8O3-δCathode Materials of Solid Oxide Fuel Cells

Wang, Cheng Cheng; Chen, Kongfa; Jiang, San Ping

doi:10.1149/2.0041412jes

Cited by 43 publications

(39 citation statements)

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“…It is in accordance with the severe sulfur poisoning effect on LSCF as a function of temperature. 21 Nevertheless, the size of the deposits formed on the surface of the LSCF electrode is in the range of 1∼3.5 μm (Fig. 3i), very different from that formed in the presence of S only after the heat-treatment at the same temperatures (Fig.…”

Section: Resultsmentioning

confidence: 88%

“…• C. 17,21 were also shown in the figure. There are significant increases in both the size and number of deposits on the LSCF surface.…”

Section: Resultsmentioning

confidence: 92%

“…The surface of LSCF sample is almost completely covered by the deposits formed on the surface of LSCF grains and the particles formed are strontium sulfate, SrSO 4 , as shown previously. 21 As the temperature decreases to 600…”

Section: Resultsmentioning

confidence: 99%

“…21 Sulfur deposition shows a strong dependence on the temperature and is most severe at temperatures around 700…”

mentioning

confidence: 99%

“…21 In SOFC stack operation conditions, both chromium and sulfur source exists. Horita et al 5 studied the effect of impurities on the performance stability of the flatten tubular SOFC stack and found that the concentrations of contaminants like Cr, Si and S increase with the operation time.…”

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Co-Deposition and Poisoning of Chromium and Sulfur Contaminants on La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δCathodes of Solid Oxide Fuel Cells

Wang

O’Donnell

et al. 2015

J. Electrochem. Soc.

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The presence of both chromium and sulfur (Cr/S) contaminants on the microstructure and electrocatalytic activity properties of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) electrodes of solid oxide fuel cells (SOFCs) is studied, using Confocal laser Raman spectroscopy, XRD, scanning electron microscopy, X-ray photoelectron spectroscopy (XPS) and electrical conductivity relaxation (ECR) methods. LSCF dense bar samples were heat treated in the presence of Cr 2 O 3 and 20 ppm SO 2 and in the temperature range of 600-900 • C. The deposition and reaction products between LSCF and Cr/S depend on the temperature: SrCrO 4 only forms on LSCF samples at 900 • C and 800 • C, while formation of SrSO 4 phase occurs at all temperatures studied. The results indicate that sulfur shows a higher activity with LSCF, as compared to gaseous Cr species. Segregated SrO is more likely to react with gaseous Cr species at higher temperatures, however, reaction with SO 2 is more pronounced at lower temperatures, forming SrSO 4 . ECR results indicate that co-deposition of Cr and sulfur significantly deteriorates the surface exchange and diffusion processes for the O 2 reduction reaction on LSCF electrodes. The durability of a solid oxide fuel cell (SOFC) is critically related to the degradation behavior of its cathodes such as La 0.8 Sr 0.2 MnO 3 (LSM) and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) in the presence of impurity species such as chromium from the chromia-forming interconnect, silica, boron and volatile alkaline elements from the glass seals sealant and sulfur from air.1-8 Among them, gaseous chromium species vaporized from the chromium oxide scale of chromia-forming metallic interconnect are probably the most investigated contaminants affecting the performance of SOFCs' cathodes. The mechanism and process of the deposition and poisoning of chromium species at the cathodes of SOFCs have been extensively investigated, including LSM, 9-11 LSCF 12 and Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF). 13 In the case of LSCF electrodes, deposition of Cr species preferentially take place on the surface of the LSCF electrode, resulted from the interaction between the segregated SrO and gaseous Cr species.14,15 Both the humidity in the air stream and operation temperature have a significant effect on the Cr deposition. 16 Cr deposition decreases significantly with the decrease of temperature, most likely due to the reduced Sr segregation as well as the decrease of the partial pressure of gaseous Cr species at reduced temperatures. 17The sulfur in the form of SO 2 or H 2 S in the air stream is another important contaminant affecting the performance stability of SOFC cathodes. SO 2 content in air can be in the range of 10-340 μg m −3 (3.5 × 10 −3 -0.12 ppm) in cities. 18 Despite the low concentration of SO 2 , sulfur in the air stream can accumulate at the cathodes of SOFC cells, degrading the performance.5 Wang et al. 19 studied the polarization performance behavior of LSCF in the presence of 0.1 ppm SO 2 and observed two-stages of performance degrad...

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Section: Resultsmentioning

confidence: 88%

“…• C. 17,21 were also shown in the figure. There are significant increases in both the size and number of deposits on the LSCF surface.…”

Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

“…21 Sulfur deposition shows a strong dependence on the temperature and is most severe at temperatures around 700…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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Co-Deposition and Poisoning of Chromium and Sulfur Contaminants on La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δCathodes of Solid Oxide Fuel Cells

Wang

O’Donnell

et al. 2015

J. Electrochem. Soc.

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A critical review of key materials and issues in solid oxide cells

Zou

Chen

et al. 2023

Interdisciplinary Materials

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Solid oxide cells (SOCs) are all solid ceramic devices with the dual functionality of solid oxide fuel cells (SOFCs) to convert the chemical energy of fuels like H2, natural gas and other hydrocarbons to electricity and of solid oxide electrolysis cells (SOECs) to store renewable electric energy of sun and wind in hydrogen fuel. Among the electrochemical energy conversion and storage devices, SOCs are the most clean and efficient technology with unique dual functionality. Due to the high operation temperature (typically 600–800°C), SOCs exhibit many advantages over other energy conversion devices, such as low material cost, high efficiency and fuel flexibility. There has been rapid development of SOC technologies over the last decade with significant advantages and progress in key materials and a fundamental understanding of key issues such as an electrode, electrolyte, performance degradation, poisoning, and stack design. The reversible polarization also has a critical effect on the surface segregation and stability of the electrode and electrode/electrolyte interface. This critical review starts with a brief introduction, working principles and thermodynamics of SOC technology to readers with interests in this rapidly developing and emerging field. Then the key materials currently used in SOCs are summarized, followed by the discussion of the most advanced electrode modification methods and critical issues of SOCs, including the surface chemistry, segregation, electrode/electrolyte interface and varying material degradation mechanisms under reversible operations. The challenges and prospects of SOC technology for future developments are discussed.

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Solid Oxide Fuel Cells: Techniques and Characterization

2021

Introduction to Fuel Cells

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Sulfur Deposition and Poisoning of La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δCathode Materials of Solid Oxide Fuel Cells

Cited by 43 publications

References 41 publications

Co-Deposition and Poisoning of Chromium and Sulfur Contaminants on La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δCathodes of Solid Oxide Fuel Cells

Co-Deposition and Poisoning of Chromium and Sulfur Contaminants on La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δCathodes of Solid Oxide Fuel Cells

A critical review of key materials and issues in solid oxide cells

Solid Oxide Fuel Cells: Techniques and Characterization

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Sulfur Deposition and Poisoning of La0.6Sr0.4Co0.2Fe0.8O3-δCathode Materials of Solid Oxide Fuel Cells

Cited by 43 publications

References 41 publications

Co-Deposition and Poisoning of Chromium and Sulfur Contaminants on La0.6Sr0.4Co0.2Fe0.8O3-δCathodes of Solid Oxide Fuel Cells

Co-Deposition and Poisoning of Chromium and Sulfur Contaminants on La0.6Sr0.4Co0.2Fe0.8O3-δCathodes of Solid Oxide Fuel Cells

A critical review of key materials and issues in solid oxide cells

Solid Oxide Fuel Cells: Techniques and Characterization

Contact Info

Product

Resources

About

Sulfur Deposition and Poisoning of La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δCathode Materials of Solid Oxide Fuel Cells

Co-Deposition and Poisoning of Chromium and Sulfur Contaminants on La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δCathodes of Solid Oxide Fuel Cells

Co-Deposition and Poisoning of Chromium and Sulfur Contaminants on La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δCathodes of Solid Oxide Fuel Cells