Investigation on a novel composite solid oxide fuel cell anode with La0.6Sr0.4Co0.2Fe0.8O3−δ derived phases

Zhu, Lin; Wei, Bo; Lü, Zhe; Wang, Zhihong; Huang, Xiqiang; Cao, Zhiqun; Jiang, Wei; Li, Yiqian

doi:10.1016/j.electacta.2015.02.024

Cited by 21 publications

(6 citation statements)

References 23 publications

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“…Xu et al studied metal-support interactions and their effects in Ni-La0.6Sr0.4FeO3-δ and Ni-SrTi0.7Fe0.3O3-δ composite systems in CO2/CO methanation and methane steam reforming reactions. They found that pre-reduction treatment with hydrogen and treatment in the reaction mixture causes various structural effects resulting in exsolution of Fe particles and formation of Ni-Fe alloy particles, and improved catalytic performance [11][12][13][14] . The interaction and influence of Niperovskite materials such as Ni-La0.6Sr0.4Fe0.8Co0.2O3 (LSCF) has reached outstanding activity in ethanol fuel cells [13] .…”

Section: Introductionmentioning

confidence: 99%

“…They found that pre-reduction treatment with hydrogen and treatment in the reaction mixture causes various structural effects resulting in exsolution of Fe particles and formation of Ni-Fe alloy particles, and improved catalytic performance [11][12][13][14] . The interaction and influence of Niperovskite materials such as Ni-La0.6Sr0.4Fe0.8Co0.2O3 (LSCF) has reached outstanding activity in ethanol fuel cells [13] . Based on above observations, the Ni-perovskite composite material could produce novel catalytic effects since the metal will be exsolved from the perovskite and it forms an alloy or intermetallic after reduction, which interacts strongly with the oxide substrate.…”

Section: Introductionmentioning

confidence: 99%

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Coking resistant Ni–La0.8Sr0.2FeO3 composite anode improves the stability of syngas-fueled SOFC

Yao

Asghar

Zhao

et al. 2021

International Journal of Hydrogen Energy

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coking resistant Ni–La0.8Sr0.2FeO3 composite anode improves the stability of syngas-fueled SOFC

Yao

Asghar

Zhao

et al. 2021

International Journal of Hydrogen Energy

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“…However, the poor chemical stability of Fe‐based perovskite oxides would lead to phase decomposition in reducing atmosphere . A composite anode consisting of Co, Fe 7 Co 3 , LaSrFeO 4 , and La 2 O 3 produced by H 2 ‐decomposed LSCF presents another example about the decomposition of ferrite‐based oxide . In general, the introduction of high‐valence cations in the B‐site, such as Nb 5+ and Ti 4+ , is proved to be an effective way to improve the structural stability .…”

Section: Introductionmentioning

confidence: 99%

Niobium Doped Lanthanum Strontium Ferrite as A Redox‐Stable and Sulfur‐Tolerant Anode for Solid Oxide Fuel Cells

Wei

Cao

et al. 2017

ChemSusChem

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The Nb-doped lanthanum strontium ferrite perovskite oxide La Sr Fe Nb O (LSFNb) is evaluated as an anode material in a solid oxide fuel cell (SOFC). The effects of Nb partial substitution in the crystal structure, the electrical conductivity, and the valence of Fe ions are studied. LSFNb exhibits good structural stability in a severe reducing atmosphere at 800 °C, suggesting that high-valent Nb can effectively promote the stability of the lattice structure. The concentration of Fe increases after Nb doping, as confirmed by X-ray photoelectron spectroscopy. The maximum power density of a thick Sc-stabilized zirconia (ScSZ) electrolyte-supported single cell reached 241.6 mW cm at 800 °C with H as fuel. The cell exhibited excellent stability for 100 h continuous operation without detectable degeneration. Scanning electron microscopy clearly revealed exsolution on the LSFNb surface after operation. Meanwhile, LSFNb particles agglomerated significantly during long-term stability testing. Impedance spectra suggested that both the LSFNb anode and the (La Sr ) MnO /ScSZ cathode underwent an activation process during long-term testing, through which the charge transfer ability increased significantly. Meanwhile, low-frequency resistance (R ) mainly attributed to the anode (80 %) significantly increased, probably due to the agglomeration of LSFNb particles. The LSFNb anode exhibits excellent anti-sulfuring poisoning ability and redox stability. These results demonstrate that LSFNb is a promising anode material for SOFCs.

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“…This is expected given that the formation of a carbon template creates a reducing environment and numerous researchers have reported that binary oxide and metal phases are favored over LSCF under low oxygen fugacity atmospheres. [33][34][35] In general, primary phase peaks become broader with increasing Glucose:M molar ratios, i.e. higher carbon template concentrations, and decreasing processing temperatures.…”

Section: Resultsmentioning

confidence: 98%

The Impact of Sintering Atmosphere and Temperature on the Phase Evolution of High Surface Area LSCF Prepared by In Situ Carbon Templating

Muhoza

Taylor

Song

et al. 2021

J. Electrochem. Soc.

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The thermochemical stability of lanthanum strontium cobalt ferrite (LSCF) processed between 1000 °C–1200 °C via the in situ carbon templating method was studied. This method generates high surface area ceramics at traditional solid oxide fuel cell (SOFC) sintering temperatures by generating a carbon template in situ and subsequently removing the template by oxidation at 700 °C. Argon processed samples produced an amorphous carbon template, whereas nitrogen tended to form graphitic carbon. Prior to the oxidation step, nitrogen samples comprised larger La2O3 crystallites (22–40 nm) compared to argon (9–17 nm). Upon oxidation, argon samples resulted in a pure LSCF phase with surface areas in the 21–29 m2·g−1 range, whereas nitrogen samples contained significant impurities. This demonstrates that the size of La2O3 crystallites formed during inert processing limited the ability to produce a pure LSCF phase. Symmetrical cells comprising nano-LSCF electrodes generated by the templating method were compared to cells sintered directly in air. Impedance results suggest that nano-LSCF cells and cells processed in air were dominated by interfacial charge transfer resistance and gas diffusion, respectively. The results map out conditions for preparing and integrating high surface area, nanostructured LSCF into SOFC electrodes at traditional sintering temperatures. Strategies for improving the interfacial resistance of nano-LSCF electrodes are discussed.

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Investigation on a novel composite solid oxide fuel cell anode with La0.6Sr0.4Co0.2Fe0.8O3−δ derived phases

Cited by 21 publications

References 23 publications

Coking resistant Ni–La0.8Sr0.2FeO3 composite anode improves the stability of syngas-fueled SOFC

Coking resistant Ni–La0.8Sr0.2FeO3 composite anode improves the stability of syngas-fueled SOFC

Niobium Doped Lanthanum Strontium Ferrite as A Redox‐Stable and Sulfur‐Tolerant Anode for Solid Oxide Fuel Cells

The Impact of Sintering Atmosphere and Temperature on the Phase Evolution of High Surface Area LSCF Prepared by In Situ Carbon Templating

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