Characterization of solid oxide fuel cell using doped lanthanum gallate

Kuroda, Kiyoshi; Hashimoto, Ikiko; Adachi, Kazunori; Akikusa, Jun; Tamou, Yoshitaka; Komada, Norikazu; Ishihara, Takeshi; Takita, Yusaku

doi:10.1016/s0167-2738(00)00659-7

Cited by 88 publications

(40 citation statements)

References 16 publications

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“…15 Co 0.05 O 3-δ perovskite. [2] Nakayama et al reported high oxide ion conductivity on rare earth silicates RE 9.33 (SiO 4 ) 6 O 2 with apatite structure. [3,4] The most attractive feature is that its conductivity at a relatively low temperature (below 600 °C) is much higher than that of stabilized zirconia.…”

Section: Introductionmentioning

confidence: 99%

“…Single crystal X-ray diffraction for La 9.33 (SiO 4 ) 6 O 2 confirmed the above-mentioned results on structural analysis for the Nd-system in apatite structure (space group P6 3 /m) with no symmetry lowering. [17] However the high oxide ion conduction mechanism generated by their cation vacancy in RE 9.33 (SiO 4 ) 6 O 2 has not yet been fully understood.…”

Section: Introductionmentioning

confidence: 99%

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Oxide ion conduction mechanism in RE9.33(SiO4)6O2 and Sr2RE8(SiO4)6O2 (RE=La, Nd) from neutron powder diffraction

et al. 2006

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Oxide ion conduction mechanism was clarified by Rietveld and MEM analysis for both RE 9.33 (SiO 4 ) 6 O 2 and Sr 2 RE 8 (SiO 4 ) 6 O 2 (RE = La and Nd) in high purity using neutron powder diffraction data collected at room temperature. All compounds had an apatite type structure in space group P6 3 /m. There was neither site splitting nor interstitial site of oxide ion. RE 9.33 (SiO 4 ) 6 O 2 had cation vacancies only at 4f site. In Sr 2 RE 8 (SiO 4 ) 6 O 2 , the 4f sites were fully occupied by strontium and rare earth with a molar ratio of 1:1. Oxide ion at hexagonal channel site had large displacement along c-axis in RE 9.33 (SiO 4 ) 6 O 2 . The large displacement is induced by cooperative rotation of SiO 4 tetrahedra around rare earth in 4f site through oxide ion polyhedra around another rare earth in 6h site. The displacement, enhanced by a vacancy in the 4f site, is directly related to the oxide ion conduction in RE 9.33 (SiO 4 ) 6 O 2 .2

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Oxide ion conduction mechanism in RE9.33(SiO4)6O2 and Sr2RE8(SiO4)6O2 (RE=La, Nd) from neutron powder diffraction

et al. 2006

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“…XRD patterns have been identified as the desired perovskite phase with the cubic structure (space group Pm3m) for LSGM (23,24) and LSGMC (25). The secondary phases of LaSrGa 3 O 7 (JCPDS # 45-0637) and LaSrGaO 4 (# 80-1806) were present in both LSGM and LSGMC samples at the low calcination temperature.…”

Section: Resultsmentioning

confidence: 96%

Electrochemical Investigation of LSGMC-Composite Cathodes on LSGM-Substrate

Do¹,

Guo²,

Lu³

et al. 2008

ECS Trans.

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16 Ω were measured for LSCF/LSGMC composite cathode on LSGM substrate at 800ºC in air. Low-frequency secondary arcs in the impedance spectra of LSCF/LSGMC cathode coupled with low current density and low cathode porosity suggested possible mass transfer limitations. The LSCF/LSGMC composite electrode performed best at 800ºC (0.11 A/cm 2 at 0.045 V overpotential) while the BSCF/LSGMC performed best at the lowest temperature investigated (0.1 A/cm 2 at 700ºC and 0.04 V overpotential).

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“…generated by the cell are much lower that would be predicted theoretically, particularly in the case of thin film electrolyte membranes, raising the concern that the membrane possesses some detrimental electronic conductivity [25]. In recent years this has meant that the focus for reducing the temperature through the use of alternative electrolytes has moved to La(Sr) GaO [29]. A nickel based anode and a Sm 0.5 Sr 0.5 CoO 3 perovskite cathode were used.…”

Section: Oxygen-ion-conducting Systemsmentioning

confidence: 99%

Fuel Cells, Advanced Reactors and Smart Catalysis: The Exploitation of Ceramic Ion‐Conducting Membranes

Metcalfe¹

2003

Chem Eng & Technol

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CommunicationsThese results clearly show that the intensity observed in the two-dimensional scattering patterns comes from the porosity of the samples, which can be filled partially or totally with dibromomethane. According to contrast-matching results, the very narrow porosity existing in the original carbon fiber becomes wider during the activation process. It has been seen that the higher the burn-off, the higher the contrast-matching effect, due to the existence of a wider mean pore size of the porosity. ConclusionThe most widely used technique for characterizing microporous solids, nitrogen adsorption at 77 K, has been compared with CO 2 adsorption at low and high pressure. It has been shown that, in the case of samples with very narrow microporosity, e.g., carbon molecular sieves, nitrogen adsorption at 77 K is absent, because the narrow micropores are not accessible to nitrogen at this temperature. In this case, the N 2 at 77 K characterization may be worthless. On the other hand, it has been seen that by using CO 2 adsorption, these problems can be avoided. CO 2 adsorption at 273 K presents some advantages; the adsorption temperature is high enough to avoid diffusion problems, and its physical properties allow very low relative pressures to be attained, without the need for complex low-pressure adsorption equipment. It has been shown that by using CO 2 adsorption, the micropore volume and the MPSD of samples with very narrow MPSD can be obtained.In addition, contrast-matching lSAXS experiments have been preformed to study the evolution of the porosity in carbon fibers during physical activation with CO 2 . The original carbon fiber and two activated carbon fibers with different degrees of burn-off (29 % and 50 %) have been used for this study. The porosity of these samples, have been filled partial or totally with dibromomethane, in order to eliminate scattering. According to contrast-matching results, the very narrow porosity existing in the original carbon fiber is not accessible to dibromomethane. In addition, it is seen that the higher the burn-off degree, the higher the contrast-matching effect, due to the existence of a wider mean pore size of the porosity.In the present study, a well-established technique (gas adsorption) and a ªnewº technique (lSAXS) have both corroborated the limitations of nitrogen adsorption at 77 K for the characterization of narrow microporosity. AcknowledgementThe authors thank ESRF (Experiment Number ME-93) for the facilities and financial support. Also, we would like to thank MCYT (Project MAT 2000-0621) for financial support. However, a significant barrier to their uptake is the unavailability of membrane systems having the required performance at an acceptable cost. In this paper we will explore the use of one class of membrane that has the potential to deliver high performance at reasonable cost. Ion-conducting ceramic membranes can be used in a wide range of high temperature applications including fuel cells, advanced reactors and even smart catalytic systems.

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Characterization of solid oxide fuel cell using doped lanthanum gallate

Cited by 88 publications

References 16 publications

Oxide ion conduction mechanism in RE9.33(SiO4)6O2 and Sr2RE8(SiO4)6O2 (RE=La, Nd) from neutron powder diffraction

Oxide ion conduction mechanism in RE9.33(SiO4)6O2 and Sr2RE8(SiO4)6O2 (RE=La, Nd) from neutron powder diffraction

Electrochemical Investigation of LSGMC-Composite Cathodes on LSGM-Substrate

Fuel Cells, Advanced Reactors and Smart Catalysis: The Exploitation of Ceramic Ion‐Conducting Membranes

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