Mechanical properties at the nanometer scale of GDC and YSZ used as electrolytes for solid oxide fuel cells

Morales, M.; Roa, J.J.; Capdevila, X.G.; Segarra, M.; Piñol, S.

doi:10.1016/j.actamat.2009.12.036

Cited by 103 publications

(48 citation statements)

References 20 publications

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“…While Ni-GDC anode was enough active towards methane partial oxidation at cell temperatures higher than 700°C, the LSC-GDC cathode was enough inactive towards partial and total oxidation of methane at cell temperatures lower than 800°C. Under optimised gas compositions (CH 4 /O 2 ratio (1) and total flow rate ((530 mL min based on doped ceria materials are usually used as electrolytes [9], because of their much higher ionic conductivities than that of ytria-stabilised zirconia (YSZ) [10,11]. Another way is to reduce the thickness of the gadolinia doped ceria (GDC) electrolyte, fabricating a thin electrolyte film on an anode support.…”

Section: Introductionmentioning

confidence: 99%

Anode‐supported SOFC Operated Under Single‐chamber Conditions at Intermediate Temperatures

Morales

Roa

Capdevila³

et al. 2010

Fuel Cells

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Anode-supported SOFC was fabricated using gadolinia\ud doped ceria (GDC) as the electrolyte (15 lm of thickness),\ud Ni-GDC as the anode and La0.5Sr0.5CoO3 – d-GDC as the\ud cathode. Catalytic activities of the electrodes and electrical\ud properties of the cell were determined, using mixtures of\ud methane + air, under single-chamber conditions. This work\ud assessed with special and wide emphasis the effect of temperature,\ud gas composition and total flow rate on the cell performance.\ud As a result, operational temperature range of the\ud fuel cell was approximately between 700 and 800 °C, which\ud agrees with the results corresponding to the catalytic activities\ud of electrodes. While Ni-GDC anode was enough active\ud towards methane partial oxidation at cell temperatures\ud higher than 700 °C, the LSC-GDC cathode was enough inactive\ud towards partial and total oxidation of methane at cell\ud temperatures lower than 800 °C. Under optimised gas compositions\ud (CH4/O2 ratio (1) and total flow rate\ud ((530 mL min–1), power densities of 145 and 235Peer ReviewedPostprint (published version

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Section: Introductionmentioning

confidence: 99%

Anode‐supported SOFC Operated Under Single‐chamber Conditions at Intermediate Temperatures

Morales

Roa

Capdevila³

et al. 2010

Fuel Cells

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“…During the last decade, several authors have studied a range of mechanical properties of bulk YSZ [11] and GDC electrolyte materials, such as nanohardness, elastic modulus and toughness fracture [12,13]. However, studies about the different plastic mechanisms induced by nanoindentation technique are rather limited in the literature.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characterisation at Nanometric Scale of a New Design of SOFCs

et al. 2010

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The mechanical stability is an important parameter to gain knowledge in the potential applications of a novel design of electrolyte‐supported SOFC, based on yttria‐stabilised zirconia (YSZ) and NiO‐YSZ composites, with cross‐linked channels (∼90 μm of diameter). In this experimental work, the mechanical properties (hardness, H and Young's modulus, E) at different applied loads have been studied using the nanoindentation technique and the equivalent indenter method. On the other hand, the different fracture mechanisms have been determined using atomic force microscopy (AFM), observing the plastic behaviour that takes place during the indentation process. H value for YSZ is higher than that for NiO‐YSZ, while E values for YSZ and NiO‐YSZ are 260 ± 15 and 205 ± 20 GPa, respectively. Only YSZ samples present several radial cracks at the corners nucleated by sharp indentation, thus indicating that H values have been underestimated.

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“…20,21 This decrease can be attributed to both the microstructural differences of tubular support and the use of doped ceria in the support, AFL and electrolyte, which presents lower mechanical properties than YSZ. 47,48 In any case, the mechanical strength in terms of MOR and Weibull modulus for the studied half-cell may be suitable for their implementation in robust stacks.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Microtubular solid oxide fuel cells fabricated by gel-casting: the role of supporting microstructure on the mechanical properties

Morales

Laguna‐Bercero

2017

RSC Adv.

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Different cell configurations of anode-supported microtubular solid oxide fuel cells (mT-SOFCs) using samaria-doped ceria (SDC) as the electrolyte were fabricated. Several cells were processed varying the porosity and wall thickness (outer diameter) of NiO-SDC tubular supports. Suitable aqueous slurry formulations of NiO-SDC for gel-casting were prepared using agarose, as a gelling agent, and sucrose, as a pore former. The subsequent NiO-SDC anode functional layer (AFL), the SDC electrolyte and the La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3Àd -SDC cathode were deposited by spray-coating. Afterwards, the electrochemical performance of different single cells was tested under humidified hydrogen as the fuel and air as the oxidant. The mechanical strength of the supporting tubes at different processing stages (green, pre-/ post-sintering, post-reduction, post-redox cycle conditions) were also determined to study the macromechanical failure behaviour of the cells. In addition, the mechanical strength of half-cells with different porosity, sintering temperature and wall thickness in the tubular supports was also determined. For this purpose, the modulus of rupture was measured by a three point bending test. This study shows that the electrochemical properties and mechanical strength are feasible for further development of anodesupported mT-SOFCs fabricated by gel-casting.

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Mechanical properties at the nanometer scale of GDC and YSZ used as electrolytes for solid oxide fuel cells

Cited by 103 publications

References 20 publications

Anode‐supported SOFC Operated Under Single‐chamber Conditions at Intermediate Temperatures

Anode‐supported SOFC Operated Under Single‐chamber Conditions at Intermediate Temperatures

Mechanical Characterisation at Nanometric Scale of a New Design of SOFCs

Microtubular solid oxide fuel cells fabricated by gel-casting: the role of supporting microstructure on the mechanical properties

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