Performance and degradation of La0.8Sr0.2Ga0.85Mg0.15O3−δ electrolyte-supported cells in single-chamber configuration

Morales, M.; Pérez-Falcón, José Manuel; Moure, A.; Tartaj, J.; Espiell, F.; Segarra, M.

doi:10.1016/j.ijhydene.2014.01.019

Cited by 16 publications

(8 citation statements)

References 32 publications

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“…10 For this purpose, both decreasing the electrolyte thickness to reduce ohmic resistance losses and using based electrolytes on gadolinium doped ceria (GDC), samarium doped ceria (SDC), or strontium and magnesium doped LaGaO 3 perovskite (LSGM), which present high ionic conductivity at intermediate temperatures, are good approaches. [11][12][13] In contrast, the manufacturing of mT-SOFCs is the main disadvantage in comparison to the planar design, as it is more difficult to fabricate a tight electrolyte layer deposited on a porous substrate in the tubular geometry. For this reason, processing methods are one of the most important topics in microtubular SOFC research, which present several difficulties, such as a relatively high investment in equipment and a long time for the adjustment of processing parameters.…”

Section: Introductionmentioning

confidence: 99%

The effect of anode support on the electrochemical performance of microtubular solid oxide fuel cells fabricated by gel-casting

et al. 2015

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Section: Introductionmentioning

confidence: 99%

The effect of anode support on the electrochemical performance of microtubular solid oxide fuel cells fabricated by gel-casting

et al. 2015

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“…40 FeO 2.8 , in stainless-steel media, produces an amorphous and highly reactive ceramic precursor which allows the synthesis to be achieved at 50-100ºC lower temperatures than those needed through classical solid-state methods. The stability of the perovskite phase is increased by the presence of Sr. Ceramics with high relative density (up to 98%) are M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 9 obtained at low sintering temperatures (1000-1050ºC) thanks to the high reactivity of the precursors and the eventual aid of a liquid phase.…”

Section: Mechanosynthesismentioning

confidence: 99%

“…In addition, the high diffusivity of the grain boundaries results in high conductivities and low activation energies that make possible to reduce the working temperature of these devices [40][41][42][43][44][45][46]. Thus, this original approach constitutes a good alternative for processing materials as electrolytes in SOFC applications which can successfully operate at intermediate temperatures (600 ºC-800 ºC).…”

Section: Proton Conductivity In Oxides (Based On Work From the Solidmentioning

confidence: 99%

Recent advances in perovskites: Processing and properties

Moure

Peña

2015

Progress in Solid State Chemistry

161

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The perovskite structure is one of the most wonderful to exist in nature. It obeys to a quite simple chemical formula, ABX 3 , in which A and B are metallic cations and X, an anion, usually oxygen. The anion packing is rather compact and leaves interstices for large A and small B cations. The A cation can be mono, di or trivalent, whereas B can be a di, tri, tetra, penta or hexavalent cation. This gives an extraordinary possibility of different combinations and partial or total substitutions, resulting in an incredible large number of compounds. Their physical and chemical properties strongly depend on the nature and oxidation states of cations, on the anionic and cationic stoichiometry, on the crystalline structure and elaboration techniques, etc.In this work, we review the different and most usual crystalline representations of perovskites, from high (cubic) to low (triclinic) symmetries, some well-known preparation methods, insisting for instance, in quite novel and original techniques such as the mechanosynthesis processing. Physical properties are reviewed, emphasizing the electrical (proton, ionic or mixed conductors) and catalytic properties of Mn-and Co-based perovskites ; a thorough view on the ferroelectric properties is presented, including piezoelectricity, thermistors or pyroelectric characteristics, just to mention some of them ; relaxors, microwave and optical features are also discussed, to end up with magnetism, superconductivity and multiferroïsme.Some materials discussed herein have already accomplished their way but others have promising horizons in both fundamental and applied research.To our knowledge, no much work exists to relate the crystalline nature of the different perovskite-type compounds with their properties and synthesis procedures, in particular with the most recent and newest processes such as the mechanosynthesis approach. Although this is not intended to be a full review of all existing perovskite materials, this report offers a good compilation of the main compounds, their structure and microstructure, processing and relationships between these features.

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“…Recently, new strategies for the synthesis of robust hollow fibers as microtubular supports have been reported (17,18,19).Many studies of mT-SOFCs perovskite (LSGM). (29,30,31,32,33) In anode-supported mT-SOFCs, volumetric power density depends remarkably on the inverse of cell diameter, (34) and the area power density is also strongly affected by the wall thickness and the porosity of tubular support. (6,35,36) These devices should also require a good strength for handling during their manufacturing of the single-cell and assembling the fuel-cell stack.…”

Section: Introductionmentioning

confidence: 99%

Influence of Anode Functional Layers on Electrochemical Performance and Mechanical Strength in Microtubular Solid Oxide Fuel Cells Fabricated by Gel-Casting

Morales

Laguna‐Bercero

2018

ACS Appl. Energy Mater.

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Anode-supported micro-tubular solid oxide fuel cells (mT-SOFCs) using samaria-doped ceria (SDC) as electrolyte were fabricated, varying the composition and number of anode functional layers (AFLs), by combining the aqueous gel-casting and spraycoating techniques. Suitable aqueous slurry formulation of NiO-SDC was prepared using agarose as a gelling agent for gel-casting of tubular supports. Afterwards, 40:60 and 50:50 wt.% NiO-SDC as AFLs and SDC electrolyte were deposited by spraycoating, and subsequently co-sintered. Finally, mT-SOFCs with 2.5 mm outer diameter and thicknesses of 380 µm support; 0, 12 and 24 µm AFLs; 15 µm electrolyte; and 30 µm cathode were obtained. The influence of AFLs on the performance and mechanical integrity was investigated for the three cells. For this purpose, electrochemical and mechanical tests at both macroscopic and micro-/nanometric scales (at the AFLs region) were determined by flexural strength and nanoindentation techniques, respectively. The results evidence that the use of AFLs with an adequate composition and microstructure in the mT-SOFCs is required to improve the performance and mechanical strength of cell. The cell with a single-layer AFL of 50:50 wt.% NiO-SDC and 12 µm thickness exhibited the best performance (0.52 Wcm-2) at 650ºC using hydrogen as fuel and air as oxidant.

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Performance and degradation of La0.8Sr0.2Ga0.85Mg0.15O3−δ electrolyte-supported cells in single-chamber configuration

Cited by 16 publications

References 32 publications

The effect of anode support on the electrochemical performance of microtubular solid oxide fuel cells fabricated by gel-casting

The effect of anode support on the electrochemical performance of microtubular solid oxide fuel cells fabricated by gel-casting

Recent advances in perovskites: Processing and properties

Influence of Anode Functional Layers on Electrochemical Performance and Mechanical Strength in Microtubular Solid Oxide Fuel Cells Fabricated by Gel-Casting

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