Sr2Fe1.5Mo0.5O6 as Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells with La0.8Sr0.2Ga0.87Mg0.13O3 Electrolyte

Xiao, Guoliang; Liu, Qiang; Zhao, Fei; Zhang, Lei; Xia, Changrong; Chen, Fanglin

doi:10.1149/1.3556085

Cited by 134 publications

(73 citation statements)

References 31 publications

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“…5 Similar TEC data were reported for SrFe 0.75 Mo 0.25 O 3-δ by dilatometry. 26 Nevertheless, it is known that fabrication of composite anodes, consisting of mixture of powders of the anode material and electrolyte can lead to a decrease of TEC, and for instance, a composite of 60 wt% (Fig. 3a).…”

Section: Resultsmentioning

confidence: 99%

Carbon Deposition and Sulfur Poisoning in SrFe_0.75Mo_0.25O_3-δand SrFe_0.5Mn_0.25Mo_0.25O_3-δElectrode Materials for Symmetrical SOFCs

Zheng

Świerczek

Polfus

et al. 2015

J. Electrochem. Soc.

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Redox stable SrFe 0.75 Mo 0.25 O 3-δ and SrFe 0.5 Mn 0.25 Mo 0.25 O 3-δ electrode materials were studied in terms of their physicochemical properties and electrochemical performance in symmetrical SOFCs, with focus on their tolerance toward carbon deposition and sulfur poisoning. Both materials possess cubic, B-site cation-disordered Pm-3m structure in air up to high temperatures. SrFe 0.5 Mn 0.25 Mo 0.25 O 3-δ was found to transform to a B-site cation-ordered structure after reduction in dry 5 vol% H 2 /Ar at 1100 • C, while no structural changes were observed for SrFe 0.75 Mo 0.25 O 3-δ . Weight change upon annealing up to 850 • C in air and in dry 5 vol% H 2 /Ar indicated an increase in oxygen deficiency on the order of δ = 0.2. Seebeck coefficient and conductivity dependence on the oxygen partial pressure pO 2 showed that both oxides exhibit p-type conductivity in air and n-type conductivity under reducing conditions. Carbon deposition was found to depend on temperature, gas composition (CO or CH 4 ), and presence of Ce 0.8 Gd 0.2 O 1.9 electrolyte in the composite-type electrode. Stable fuel cell performance, without carbon deposition, was obtained for SrFe 0.75 Mo 0.25 O 3-δ -based SOFC in 10 vol% of CO in CO 2 . Also, SOFC operation with CH 4 as fuel was achieved without coking at temperatures ≤ 700 • C. However, both oxides suffer from sulfur poisoning-related effects in atmosphere with 800 ppm H 2 S. Compatibility of Solid Oxide Fuel Cells (SOFCs) with nonhydrogen fuels represents their important advantage over other types of fuel cells. Versatile fuel utilization can be an essential factor for future development and commercial adoption of SOFC technology in power generation, for instance, from biogas used as a renewable energy source.1,2 One of the main challenges with SOFCs running directly on carbon containing fuels, such as syngas, methane/biogas or other hydrocarbons, is carbon deposition occurring on the anode, which results in a significant, and sometimes detrimental decrease of the performance. In the case of well-established Ni-YSZ cermet anode, the performance degradation upon coking arises mainly from a decrease in length of the Triple Phase Boundary (TPB) on the anode, which limits the number of catalytic sites needed for fuel oxidation.1,2 Furthermore, the deposited carbon may expand and destroy mechanical integrity of the electrode. Also, the considered nonhydrogen fuels usually contain sulfur (in a form of H 2 S), which can irreversibly poison Ni-YSZ cermet anodes.1-3 It may be stated that construction of robust SOFCs with fuel versatility relies upon a development of the anode materials with improved tolerance towards carbon deposition and sulfur poisoning. Mo-containing perovskitetype oxides have shown promise in this respect.3,4 The considered family of materials possesses crystal structure that can be either B-site cation disordered, denoted as AM 1-x Mo x O 3-δ (A: Sr, Ba; M: 3d metals) or B-site cation-ordered one (so called double perovskite structure), A 2 M 2-x Mo x O 6-δ . 3,5 T...

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Section: Resultsmentioning

confidence: 99%

Carbon Deposition and Sulfur Poisoning in SrFe_0.75Mo_0.25O_3-δand SrFe_0.5Mn_0.25Mo_0.25O_3-δElectrode Materials for Symmetrical SOFCs

Zheng

Świerczek

Polfus

et al. 2015

J. Electrochem. Soc.

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“…However, the relationship between the activity and the properties of the material, especially the conductivity and the surface composition, is still unclear [18] [19,20].…”

Section: Introductionmentioning

confidence: 99%

Sr2Fe2−Mo O6− perovskite as an anode in a solid oxide fuel cell: Effect of the substitution ratio

Zhao

Wang

et al. 2016

Catalysis Today

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“…The ASR values of the SFT cathodes are much lower than that of the reported double perovskite-type cathode materials. For example, the ASR values are 0.076 Ω cm 2 at 800 1C for Sr 2 Fe 1.5 Mo 0.5 O 6 cathode on the LSGM electrolyte [53], and 0.74 Ω cm 2 at 750 1C for Sr 2 Fe 0.1 Co 0.9 NbO 6 cathode on CGO electrolyte [54]. Thus, SFT is expected to have higher catalytic activity for the reduction of molecular oxygen at intermediate temperatures.…”

Section: Ac Impedance Studymentioning

confidence: 99%

Evaluation of double perovskite Sr2FeTiO6−δ as potential cathode or anode materials for intermediate-temperature solid oxide fuel cells

Cheng

Zhou

et al. 2015

Ceramics International

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Sr2Fe1.5Mo0.5O6 as Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells with La0.8Sr0.2Ga0.87Mg0.13O3 Electrolyte

Cited by 134 publications

References 31 publications

Carbon Deposition and Sulfur Poisoning in SrFe_0.75Mo_0.25O_3-δand SrFe_0.5Mn_0.25Mo_0.25O_3-δElectrode Materials for Symmetrical SOFCs

Carbon Deposition and Sulfur Poisoning in SrFe_0.75Mo_0.25O_3-δand SrFe_0.5Mn_0.25Mo_0.25O_3-δElectrode Materials for Symmetrical SOFCs

Sr2Fe2−Mo O6− perovskite as an anode in a solid oxide fuel cell: Effect of the substitution ratio

Evaluation of double perovskite Sr2FeTiO6−δ as potential cathode or anode materials for intermediate-temperature solid oxide fuel cells

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Sr2Fe1.5Mo0.5O6 as Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells with La0.8Sr0.2Ga0.87Mg0.13O3 Electrolyte

Cited by 134 publications

References 31 publications

Carbon Deposition and Sulfur Poisoning in SrFe0.75Mo0.25O3-δand SrFe0.5Mn0.25Mo0.25O3-δElectrode Materials for Symmetrical SOFCs

Carbon Deposition and Sulfur Poisoning in SrFe0.75Mo0.25O3-δand SrFe0.5Mn0.25Mo0.25O3-δElectrode Materials for Symmetrical SOFCs

Sr2Fe2−Mo O6− perovskite as an anode in a solid oxide fuel cell: Effect of the substitution ratio

Evaluation of double perovskite Sr2FeTiO6−δ as potential cathode or anode materials for intermediate-temperature solid oxide fuel cells

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Carbon Deposition and Sulfur Poisoning in SrFe_0.75Mo_0.25O_3-δand SrFe_0.5Mn_0.25Mo_0.25O_3-δElectrode Materials for Symmetrical SOFCs

Carbon Deposition and Sulfur Poisoning in SrFe_0.75Mo_0.25O_3-δand SrFe_0.5Mn_0.25Mo_0.25O_3-δElectrode Materials for Symmetrical SOFCs