Properties and electrochemical performance of La0.75Sr0.25Cr0.5Mn0.5O3−δ–La0.2Ce0.8O2−δ composite anodes for solid oxide fuel cells

Rath, Manas Kumar; Choi, Byung-Hyun; Lee, Kitae

doi:10.1016/j.jpowsour.2012.03.105

Cited by 25 publications

(11 citation statements)

References 34 publications

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“…Conductive oxides have been widely reported as potential candidates for solid oxide fuel cell (SOFC) anodes owing to the fact that they are mixed ionic and electronic conductors in typical anode conditions. − Some of these oxide materials, including the perovskites La 0.75 Sr 0.25 Cr 0.5 Mn 0.5 O 3 and SrTi 0.3 Fe 0.7 O 3−δ , have exhibited decidedly low anode polarization resistance R P,A values (≤0.2 Ω·cm 2 ) ,, that are reasonably close to those of typical SOFC anode material Ni-YSZ (<0.1 Ω·cm 2 at 800 °C) . One example of a mixed conducting oxide is the perovskite (La,Sr)(Cr,Fe)O 3−δ , which has demonstrated substantially lower R P,A than the exclusively electronically conducting (La,Sr)CrO 3−δ . , Recent studies on this perovskite have shown that by increasing the ratio of Fe to Cr substituted on the B-site, oxygen deficiency is increased, and the ionic conductivity is improved.…”

Section: Introductionmentioning

confidence: 88%

Decreasing the Polarization Resistance of (La,Sr)CrO_3−δ Solid Oxide Fuel Cell Anodes by Combined Fe and Ru Substitution

et al. 2015

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The perovskite compounds La 0.33 Sr 0.67 Cr 1−x−yFe x Ru y O 3−δ (LSCrFeRu, x = 0.62, 0.57, and 0.47; y = 0.05, 0.14, and 0.2, respectively) were synthesized and assessed as a new type of solid oxide fuel cell (SOFC) anode in composite with Gd 0.1 Ce 0.9 O 2-β (GDC) in La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3-ε / La 0.4 Ce 0.6 O 2 bilayer electrolyte-supported cells. By comparing anode polarization resistance R P,A values for the LSCrFeRu compounds to the either exclusively Fe-or Ru-substituted (La,Sr)CrO 3−δ perovskites, the present results demonstrate that the two substituent cations work synergistically to provide further reduction in R P,A from 0.290 Ω·cm 2 for La 0.33 Sr 0.67 Cr 0.33 -F e 0 . 6 7 O 3 − δ ( L S C r F e ) a n d 0 . 2 3 5 Ω · c m 2 f o r La 0.8 Sr 0.2 Cr 0.8 Ru 0.2 O 3−δ (LSCrRu) to 0.195 Ω·cm 2 for LSCrFeRu (all measured in humidified hydrogen at 800°C). These impedance results also strongly suggest that hydrogen dissociative adsorption was the rate-limiting step in the hydrogen oxidation reaction sequence for LSCrFe anodes at some of the pH 2 and temperatures measured. However, the formation of Ru nanoparticles on LSCrFeRu and LSCrRu surfaces, observed by scanning and transmission electron microscopy, appears to promote hydrogen dissociation. Substituting even small amounts of Ru into (La,Sr)(Cr,Fe)O 3−δ perovskites is thus sufficient to make hydrogen electrochemical oxidation the rate-limiting step, resulting in anodes with significantly reduced R P,A .

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Section: Introductionmentioning

confidence: 88%

Decreasing the Polarization Resistance of (La,Sr)CrO_3−δ Solid Oxide Fuel Cell Anodes by Combined Fe and Ru Substitution

et al. 2015

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“…Composites of LSCM with doped ceria show better activity, as well as increased carbon deposition. In one study, carbon deposition after exposure to dry methane for 6 h at 750 °C increased from less than 0.1 wt % in pure LSCM to 1.5 wt % in 33 wt % LSCM:67 wt % lanthanum-doped ceria . An increase in the amount of the doped ceria improved performance in fuel cell tests in methane, although above 50 wt % ceria the performance dropped, probably due to lower electronic conduction.…”

Section: Materials Design Strategies For Carbon Tolerance In Sofc Anodesmentioning

confidence: 99%

Strategies for Carbon and Sulfur Tolerant Solid Oxide Fuel Cell Materials, Incorporating Lessons from Heterogeneous Catalysis

et al. 2016

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Solid oxide fuel cells (SOFCs) are a rapidly emerging energy technology for a low carbon world, providing high efficiency, potential to use carbonaceous fuels, and compatibility with carbon capture and storage. However, current state-of-the-art materials have low tolerance to sulfur, a common contaminant of many fuels, and are vulnerable to deactivation due to carbon deposition when using carbon-containing compounds. In this review, we first study the theoretical basis behind carbon and sulfur poisoning, before examining the strategies toward carbon and sulfur tolerance used so far in the SOFC literature. We then study the more extensive relevant heterogeneous catalysis literature for strategies and materials which could be incorporated into carbon and sulfur tolerant fuel cells.

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“…Interestingly, the crystallite size of the LSCM in LSCM@SDC NFs is substantially smaller than that of NFs of LSCM alone (i.e., 78.1 ± 0.8 nm; Figure S2), despite the fact that they are calcined at an identical temperature. This suggests that the grain growth of LSCM particles is physically confined by the SDC envelope, which has high thermal stability as noted earlier. , This is further supported by the SEM images of LSCM NFs and SDC NFs after calcination at 1050 °C for 4 h, which display the exacerbated grain growth in LSCM NFs in contrast to that of SDC NFs (Figure S3). The chemical composition of the partially SDC encapsulated LSCM NFs was analyzed by inductively coupled plasma mass spectroscopy (ICP-MS) (Table ).…”

Section: Resultsmentioning

confidence: 99%

Nanofiber Composites as Highly Active and Robust Anodes for Direct-Hydrocarbon Solid Oxide Fuel Cells

et al. 2022

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Direct utilization of methane fuels in solid oxide fuel cells (SOFCs) is a key technology to realize the immediate inclusion of such high-efficiency fuel cells into the current electricity generation infrastructure. However, the broad commercialization of direct-methane fueled SOFCs is critically hindered by the inadequate electrode activity and their poor longevity, which primarily stems from the carbon build-up issues. To make the technology more competitive, a novel electrode structure that can dramatically improve the tolerance against coking is essential. Herein, we present highly active and robust core−shell nanofiber anodes, La 0.75 Sr 0.25 Cr 0.5 Mn 0.5 O 3 @ Sm 0.2 Ce 0.8 O 1.9 (LSCM@SDC), directly obtained with a singlenozzle electrospinning process through the use of two immiscible polymers. The intimate coverage of SDC on LSCM not only increases the active reaction sites but also promotes resistance toward carbon deposition and thermal aggregation. As such, the electrode polarization resistance obtained with LSCM@SDC NFs is among the lowest value ever reported with LSCM derivatives (∼0.11 Ω cm 2 in wet H 2 at 800 °C). The facile fabrication process of such complex heterostructures developed in this work is attractive for the design of not only SOFC electrodes but also other solid-state devices such as electrolysis cells, membrane reformers, and protonic cells.

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Properties and electrochemical performance of La0.75Sr0.25Cr0.5Mn0.5O3−δ–La0.2Ce0.8O2−δ composite anodes for solid oxide fuel cells

Cited by 25 publications

References 34 publications

Decreasing the Polarization Resistance of (La,Sr)CrO_3−δ Solid Oxide Fuel Cell Anodes by Combined Fe and Ru Substitution

Decreasing the Polarization Resistance of (La,Sr)CrO_3−δ Solid Oxide Fuel Cell Anodes by Combined Fe and Ru Substitution

Strategies for Carbon and Sulfur Tolerant Solid Oxide Fuel Cell Materials, Incorporating Lessons from Heterogeneous Catalysis

Nanofiber Composites as Highly Active and Robust Anodes for Direct-Hydrocarbon Solid Oxide Fuel Cells

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Properties and electrochemical performance of La0.75Sr0.25Cr0.5Mn0.5O3−δ–La0.2Ce0.8O2−δ composite anodes for solid oxide fuel cells

Cited by 25 publications

References 34 publications

Decreasing the Polarization Resistance of (La,Sr)CrO3−δ Solid Oxide Fuel Cell Anodes by Combined Fe and Ru Substitution

Decreasing the Polarization Resistance of (La,Sr)CrO3−δ Solid Oxide Fuel Cell Anodes by Combined Fe and Ru Substitution

Strategies for Carbon and Sulfur Tolerant Solid Oxide Fuel Cell Materials, Incorporating Lessons from Heterogeneous Catalysis

Nanofiber Composites as Highly Active and Robust Anodes for Direct-Hydrocarbon Solid Oxide Fuel Cells

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Decreasing the Polarization Resistance of (La,Sr)CrO_3−δ Solid Oxide Fuel Cell Anodes by Combined Fe and Ru Substitution

Decreasing the Polarization Resistance of (La,Sr)CrO_3−δ Solid Oxide Fuel Cell Anodes by Combined Fe and Ru Substitution