Symmetrical solid oxide fuel cells with impregnated SrFe0.75Mo0.25O3−δ electrodes

Meng, Xie; Liu, Xuejiao; Han, Da; Wu, Hao; Li, Junliang; Zhan, Zhongliang

doi:10.1016/j.jpowsour.2013.11.049

Cited by 61 publications

(27 citation statements)

References 23 publications

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“…This result is even better than that of the previous symmetrical fuel cell with 18 μm thick LSGM electrolyte and La 0.6 Sr 0.4 Fe 0.9 Sc 0.1 O 3-δ (LSFSc) electrodes, which gives a maximum power density of 0.56 W cm -2 at 800 o C [21]. However, the output performances are still lower than the prior results [22], 0.97 W cm -2 at 800 o C. That's because the oxidant of cathode in this study is fed by ambient air versus dry air at 100 mL min -1 for the prior study, resulting in an increased concentration polarization.…”

Section: Characterizationcontrasting

confidence: 53%

“…As can seen, the low-frequency arc remains almost constant, which is probably associated with gas transport through the porous LSGM skeleton or gas adsorption on the catalyst surface with the nature of temperature-independent. On the contrary, the high-frequency arc follows an Arrhenius dependence with temperature due to the thermally-activated nature of charge transfer reactions or surface diffusions [22]. The combination of anode and cathode interfacial polarization resistance were 0.17, 0.20, 0.27 and 0.40 Ω cm 2 at 800, 750, 700 and 650 o C, respectively.…”

Section: Xrd Analysis and Microstructures Of The Symmetrical Fuel Cellsmentioning

confidence: 96%

“…This will bring many attractive advantages, for instance, simplified fabrication process and cell structure, reduced materials and interfaces numbers and also better sulfur and coking tolerance. Among the symmetrical electrode materials, the perovskite molybdenum doped strontium ferrite (SFM) shows high electrical conductivity in both oxidizing and reducing environments and excellent redox stability, and exhibits promising performance as electrodes in symmetrical SOFCs [20][21][22]. As there are few reports on symmetrical electrodes and thin film LSGM electrolyte applied in DC-SOFCs, it is worthwhile to probe the feasibility of symmetrical SFM electrode operated directly on carbon fuel.…”

Section: Introductionmentioning

confidence: 99%

“…As there are few reports on symmetrical electrodes and thin film LSGM electrolyte applied in DC-SOFCs, it is worthwhile to probe the feasibility of symmetrical SFM electrode operated directly on carbon fuel. previous work [21,22]. First, a porous｜dense｜porous LSGM tri-layer structurea 17 μm thick dense layer sandwiched between two 160 μm thick porous layerswas produced by laminating three tape-casting ceramic green tapes, with 40 wt% starch as the fugitive materials for the two porous layers followed by co-sintering at 1450 o C to densify the LSGM electrolyte layer.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of symmetrical SrFe0.75Mo0.25O3−δ electrodes in direct carbon solid oxide fuel cells

Xiao

Han

et al. 2016

Journal of Alloys and Compounds

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Symmetrical solid oxide fuel cells (SOFCs) that feature nanostructured SrFe 0.75 Mo 0.25 O 3-δ (SFMO) electrodes which are impregnated into porous La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3-δ (LSGM) skeletons by solution infiltration technique are prepared. The symmetrical SOFCs are investigated in detail by operating with 5 wt.% * Corresponding author. Tel. /fax: +86 20 22236168. © 2016. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/ 2 Fe-loaded activated carbon as fuel and ambient air as oxidant. A typical single cell can give a maximum power density of 405 mW cm -2 at 850 o C, which is comparable to the results with Ni-based anode-supported SOFCs. Also, the direct carbon SOFC (DC-SOFC) with reloaded fuel can recover its initial performance. The microstructures and XRD of the electrodes after test are also examined and analysed.The results show that the SFMO-LSGM composite anode remains porous and maintains its structure stability, implying that the symmetrical SFMO electrodes can be applied into DC-SOFCs.

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Section: Characterizationcontrasting

confidence: 53%

Section: Xrd Analysis and Microstructures Of The Symmetrical Fuel Cellsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterization of symmetrical SrFe0.75Mo0.25O3−δ electrodes in direct carbon solid oxide fuel cells

Xiao

Han

et al. 2016

Journal of Alloys and Compounds

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“…For instance, particularly high conductivities were reported for Sr 2 FeMoO 6-δ with values around 1000 S · cm −1 in dry 5 vol% H 2 in argon over a wide temperature range, 8 4 , as well as iso-octane. 15,16 However, carbon deposition and sulfur poisoning issues are still under investigation for these compounds, because both processes are affected by many factors, including operating temperature, water and carbon content in the fuel, etc. 1,2 In this study, two Fe-and Mo-containing redox stable perovskites, SrFe 0.75 Mo 0.25 O 3-δ and SrFe 0.5 Mn 0.25 Mo 0.25 O 3-δ , were investigated as candidate anode and cathode materials for symmetrical SOFCs operating with CO and/or methane as fuel.…”

mentioning

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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Progress and Prospects in Symmetrical Solid Oxide Fuel Cells with Two Identical Electrodes

Wang

Liu

et al. 2015

Advanced Energy Materials

136

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The increasing impact of the greenhouse effect and environmental pollution from excessive and low-effi ciency use of everdiminishing fossil fuels has urged us to develop new energy materials and technologies for transitioning to a sustainable infrastructure. With this in mind, fuel cells, based on a concept Symmetrical solid oxide fuel cells (SOFCs) have attracted increasing attention due to their potential for improved thermomechanical compatibility of the electrolyte and the electrodes, reduced fabrication cost, and enhanced immunity to coking and sulfur poisoning. While the electrode materials of symmetrical SOFCs are initially limited to those with stable phase structures under both reducing and oxidizing atmospheres, many novel electrode materials are currently being developed and investigated that may undergo a benefi cial phase transition or reduction in a reducing atmosphere, although the same material may be used initially for the construction of both anode and cathode. Here, the advances made in the development of electrode materials and structures for symmetrical SOFCs are summarized, including single-phase electrodes, multi-phase (composite) electrodes, and those that are reducible upon exposure to a reducing atmosphere. The electrical conductivity, thermomechanical properties, and redox behavior of these electrode materials, together with their performance and stability in different SOFCs, are discussed and analyzed. The problems associated with different types of symmetrical SOFCs are outlined and the materials that show promise as symmetrical electrodes are highlighted, offering critical insights and useful guidelines for knowledge-based rational design of better electrodes for commercially viable symmetrical SOFCs.

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Symmetrical solid oxide fuel cells with impregnated SrFe0.75Mo0.25O3−δ electrodes

Cited by 61 publications

References 23 publications

Characterization of symmetrical SrFe0.75Mo0.25O3−δ electrodes in direct carbon solid oxide fuel cells

Characterization of symmetrical SrFe0.75Mo0.25O3−δ electrodes in direct carbon solid oxide fuel cells

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

Progress and Prospects in Symmetrical Solid Oxide Fuel Cells with Two Identical Electrodes

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Symmetrical solid oxide fuel cells with impregnated SrFe0.75Mo0.25O3−δ electrodes

Cited by 61 publications

References 23 publications

Characterization of symmetrical SrFe0.75Mo0.25O3−δ electrodes in direct carbon solid oxide fuel cells

Characterization of symmetrical SrFe0.75Mo0.25O3−δ electrodes in direct carbon solid oxide fuel cells

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

Progress and Prospects in Symmetrical Solid Oxide Fuel Cells with Two Identical Electrodes

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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