Combined Cr and S poisoning of La0.8Sr0.2MnO3-δ (LSM) cathode of solid oxide fuel cells

Wang, Cheng Cheng; Darvish, Shadi; Chen, Kongfa; Hou, Bingxue; Zhang, Qi; Tan, Zanxiong; Zhong, Yu

doi:10.1016/j.electacta.2019.04.116

Cited by 21 publications

(6 citation statements)

References 34 publications

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“…The Cr 2 O 3 layer formed on the surface of the SUS 430 interconnect can react with O 2 to form volatile CrO 3 in dry air, and volatile CrO 3 species enter the cathode backbone under flowing air . The Cr deposition mechanism at the cathode can be caused by an electrochemical mechanism and a chemical reaction mechanism. − For pure electronically conducting cathodes such as LSM, Cr deposition mainly occurs at the three phase boundary (TPB), which can be explained by an electrochemical mechanism . CrO 3 acquires electrons at the TPB, is electrochemically reduced to Cr 2 O 3 , and is subsequently deposited on the cathode surface, as showing in eq .…”

Section: Results and Discussionmentioning

confidence: 99%

“…36−38 For pure electronically conducting cathodes such as LSM, Cr deposition mainly occurs at the three phase boundary (TPB), which can be explained by an electrochemical mechanism. 39 CrO 3 acquires electrons at the TPB, is electrochemically reduced to Cr 2 O 3 , and is subsequently deposited on the cathode surface, as showing in eq 1. 40 Cr 2 O 3 can further react with SFM to form SrCrO 4 .…”

Section: Acs Applied Energy Materialsmentioning

confidence: 99%

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Evaluation of Cr-Tolerance of the Sr₂Fe_1.5Mo_0.5O_6−δ Cathode for Solid Oxide Fuel Cells

Qiu

Lin

Lei

et al. 2019

ACS Appl. Energy Mater.

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Sr2Fe1.5Mo0.5O6−δ (SFM) is a promising electrode material recently studied for intermediate temperature solid oxide fuel cells (IT-SOFCs). In this work, Cr-tolerance of SFM has been systematically assessed. Due to the presence of Sr at the A-site, SFM has been found to be vulnerable to Cr species that resulted from the metallic interconnects. The main product of Cr-poisoning for SFM is SrCrO4 deposited on the SFM surface. Furthermore, the Cr-poisoning mechanism of the SFM material has been evaluated both experimentally and thermodynamically. To enhance Cr-tolerance of SFM, LaCoO3−δ-infiltrated SFM (LC@SFM) has been developed. LC hinders the direct contact of SFM with Cr species, and LC@SFM has significantly enhanced Cr-tolerance compared with SFM. This study provides valuable guidance for the wide application of the SFM cathode in IT-SOFCs.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Acs Applied Energy Materialsmentioning

confidence: 99%

Evaluation of Cr-Tolerance of the Sr₂Fe_1.5Mo_0.5O_6−δ Cathode for Solid Oxide Fuel Cells

Qiu

Lin

Lei

et al. 2019

ACS Appl. Energy Mater.

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“…The effect of integrated Cr and S on the electrochemical performance of LSM cathodes was studied at 800 °C, 14 and it led to the formation of SrCrO 4 and SrSO 4 . The deposition was mainly due to a chemical reaction among Cr, S and SrO.…”

Section: Introductionmentioning

confidence: 99%

Integrated Cr and S poisoning of a La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ (LSCF) cathode for solid oxide fuel cells

et al. 2021

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“…The high operation temperature of electrolyte in SOFCs (900 °C) is an important limitation in commercial applications [9]. For this reason, porous materials with high and stable ionic (10 -1 -10 -4 S cm -1 )/electrical conductivities (higher than 100 S cm -1 ) at temperatures from 600 °C to 1000°C are desirable as components of the SOFCs [10,11]. At the same time, environmental regulations demand efficient methods to optimize the different sections that integrate the SOFCs [12,13].…”

Section: Introductionmentioning

confidence: 99%

Microwave irradiation synthesis to obtain La0.7-xPrxCa0.3MnO3 perovskites: Electrical and electrochemical performance

Ferrel-Álvarez

Domínguez‐Crespo

Cong

et al. 2021

Journal of Alloys and Compounds

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La0.7-xPrxCa0.3MnO3 (LPCM) perovskites previously synthesized by the microwave-assisted method at 4 minutes and with different stoichiometry (x=0.35, 0.52 and 0.63) were evaluated through thermogravimetric analysis (TGA), electrical conductivity, thermal expansion coefficient (TEC), scanning electron microscopy (SEM), Brunauer-Emmet-Teller (BET) analysis and electrochemical impedance spectroscopy (EIS) using yttria stabilized zirconia (YSZ) as an electrolyte. The results are discussed in terms of the potential as cathode material to be applied in solid oxide fuel cells (SOFCs) applications at temperatures from 600 to 800 °C. Results derived from TGA showed that Pr promotes the uncoupling oxygen and oxygen vacancies favoring the fuel combusting. Also, TEC analysis revealed adequate stability between the YSZ electrolyte and the La0.7-xPrxCa0.3MnO3 to avoid cracking or failing, especially with high amount of Pr. The transition in morphology from irregular to regular shapes improves the BET and Barret-Joyner-Halenda (BJH) surfaces and promotes the triple phase boundary (TPB) connectivity. The electrical conductivity correlated to the availability in oxygen vacancies showed maximum conductivities in the order of 10 -2 S cm -1 . Activation energy (Ea) was found to be reduced with a minimum quantity of Pr (0.071 eV). EIS results indicate that the oxygen vacancies in the LPCM/YSZ system were better promoted with the highest amount of Pr= 0.63 (=0.9 V, 800 °C and 0.06 V of amplitude) in comparison with the minimum, Pr=0.35 (=1.2 V, 800 °C and 0.06 V of amplitude).

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Combined Cr and S poisoning of La0.8Sr0.2MnO3-δ (LSM) cathode of solid oxide fuel cells

Cited by 21 publications

References 34 publications

Evaluation of Cr-Tolerance of the Sr₂Fe_1.5Mo_0.5O_6−δ Cathode for Solid Oxide Fuel Cells

Evaluation of Cr-Tolerance of the Sr₂Fe_1.5Mo_0.5O_6−δ Cathode for Solid Oxide Fuel Cells

Integrated Cr and S poisoning of a La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ (LSCF) cathode for solid oxide fuel cells

Microwave irradiation synthesis to obtain La0.7-xPrxCa0.3MnO3 perovskites: Electrical and electrochemical performance

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Combined Cr and S poisoning of La0.8Sr0.2MnO3-δ (LSM) cathode of solid oxide fuel cells

Cited by 21 publications

References 34 publications

Evaluation of Cr-Tolerance of the Sr2Fe1.5Mo0.5O6−δ Cathode for Solid Oxide Fuel Cells

Evaluation of Cr-Tolerance of the Sr2Fe1.5Mo0.5O6−δ Cathode for Solid Oxide Fuel Cells

Integrated Cr and S poisoning of a La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) cathode for solid oxide fuel cells

Microwave irradiation synthesis to obtain La0.7-xPrxCa0.3MnO3 perovskites: Electrical and electrochemical performance

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Evaluation of Cr-Tolerance of the Sr₂Fe_1.5Mo_0.5O_6−δ Cathode for Solid Oxide Fuel Cells

Evaluation of Cr-Tolerance of the Sr₂Fe_1.5Mo_0.5O_6−δ Cathode for Solid Oxide Fuel Cells

Integrated Cr and S poisoning of a La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ (LSCF) cathode for solid oxide fuel cells