Electrolyte materials for solid oxide fuel cells derived from metal complexes: Gadolinia-doped ceria

Veranitisagul, Chatchai; Kaewvilai, Attaphon; Wattanathana, Worawat; Koonsaeng, Nattamon; Traversa, Enrico; Laobuthee, Apirat

doi:10.1016/j.ceramint.2011.11.006

Cited by 41 publications

(22 citation statements)

References 17 publications

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“…The impedance spectra of the samples were similar to the trend observed for ceramic materials as frequently published in the literature . By curve fitting a circle to the semicircles on the impedance spectra, the sample resistances were obtained as R total = R gi + R gb .…”

Section: Resultssupporting

confidence: 65%

Polyol Synthesis and Investigation of Ce_1−xRE_xO_2−x/2 (RE = Sm, Gd, Nd, La, 0 ≤ x ≤ 0.25) Electrolytes for IT‐SOFCs

et al. 2014

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In this study, we aimed to examine the effect of dopant type and concentration on the ionic conductivity of ceria‐based electrolytes. Ceria electrolytes doped with samarium (SDC), gadolinium (GDC), neodymium (NDC), and lanthanum (LDC) for solid oxide fuel cells were prepared through the polyol process. Acetate compounds of cerium and dopants were used as starting materials, and triethylene glycol was used as a solvent. Prepared powders and pellets were characterized by TG/DTA, XRD, FTIR, SEM, EIS, and EDS techniques. The results of the TG/DTA and XRD indicated that a single‐phase fluorite structure formed at the relatively low calcination temperature of 500°C. The relative densities of the pellets were higher than 90% and these finding were supported by the SEM images. The lattice parameters of the samples increased with the dopant concentration. According to the electrochemical analysis results, the samples with maximum conductivity values were SDC‐20, GDC‐15, NDC‐15, and LDC‐15. The results of the impedance spectroscopy revealed that the SDC‐20 sample exhibited the highest ionic conductivity with a value of 4.29 × 10−2 S/cm at 800°C in air.

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Section: Resultssupporting

confidence: 65%

Polyol Synthesis and Investigation of Ce_1−xRE_xO_2−x/2 (RE = Sm, Gd, Nd, La, 0 ≤ x ≤ 0.25) Electrolytes for IT‐SOFCs

et al. 2014

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“…The total conductivity of the GDC sample sintered using two‐step profile was 10 times higher than conventional sintering. For comparison, the total conductivity of GDC taken after Huang et al, Veranitisagul et al and Cheng et al are shown in Figure . The total conductivity of GDC prepared via CSP and two‐step profile was comparable to that observed in this literature although they employed higher sintering temperature and those samples showed higher density.…”

Section: Resultssupporting

confidence: 65%

“…Arrhenius plot of total conductivity of gadolinium‐doped cerium oxide (GDC) using different sintering approach (red) two‐step sintering at 1300°C for 1 min—800°C for 5 h (blue) conventional sintering at 1650°C for 10 h). The black lines are the total conductivity cited from the works by Huang et al, Veranitisagul et al and Cheng et al [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

Solvent‐deficient method lowers grain‐boundary resistivity of doped ceria

2019

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Nanoparticles of gadolinium‐doped cerium oxide (GDC) were synthesized using solvent‐deficient method and their sinterability and electrical properties were investigated using the powder and cold sintering process. The GDC powder was uniaxially pressed into cylindrically‐shaped pellets with a mixture of nitric acid and hydrogen peroxide at 200°C to encourage particle arrangement during forming process. These bulk samples were annealed using two different temperature profiles: at 800°C for 5 hours and at 1300°C for 1 minute—800°C for 5 hours. The samples produced using HNO3/H2O2 mixture showed higher relative density than ones without it. Ionic conductivity of the sample sintered through the two‐step profile was obtained from electrochemical impedance spectroscopy. Although the grain conductivity for the samples (8.0 × 10−3 S cm−1 at 500°C, and 3.3 × 10−2 S cm−1 at 700°C) is on par with a conventionally sintered sample, the measured total conductivity (3.9 × 10−3 S cm−1 at 500°C, and 2.5 × 10−2 S cm−1 at 700°C) is about 10 times higher than the conventionally sintered one and is comparable to the values seen in the previous studies for GDC which employed higher sintering temperature, pointing to the effectively lower grain‐boundary impedance. This result could be attributed to no significant phase segregation along grain boundaries due to the low‐temperature processing.

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“…Gadolinia doped ceria (GDC) is reported to have appreciable ionic conductivity and ionic transport number to make it a candidate electrolyte material for intermediate temperature SOFC (IT-SOFC) [1][2][3][4]. The electrode materials should have good electro-catalytic activity in the operation temperature range.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of GdCoO3 as a potential SOFC cathode material

Lenka

Mahata

Patro

et al. 2012

Journal of Alloys and Compounds

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Electrolyte materials for solid oxide fuel cells derived from metal complexes: Gadolinia-doped ceria

Cited by 41 publications

References 17 publications

Polyol Synthesis and Investigation of Ce_1−xRE_xO_2−x/2 (RE = Sm, Gd, Nd, La, 0 ≤ x ≤ 0.25) Electrolytes for IT‐SOFCs

Polyol Synthesis and Investigation of Ce_1−xRE_xO_2−x/2 (RE = Sm, Gd, Nd, La, 0 ≤ x ≤ 0.25) Electrolytes for IT‐SOFCs

Solvent‐deficient method lowers grain‐boundary resistivity of doped ceria

Synthesis and characterization of GdCoO3 as a potential SOFC cathode material

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Electrolyte materials for solid oxide fuel cells derived from metal complexes: Gadolinia-doped ceria

Cited by 41 publications

References 17 publications

Polyol Synthesis and Investigation of Ce1−xRExO2−x/2 (RE = Sm, Gd, Nd, La, 0 ≤ x ≤ 0.25) Electrolytes for IT‐SOFCs

Polyol Synthesis and Investigation of Ce1−xRExO2−x/2 (RE = Sm, Gd, Nd, La, 0 ≤ x ≤ 0.25) Electrolytes for IT‐SOFCs

Solvent‐deficient method lowers grain‐boundary resistivity of doped ceria

Synthesis and characterization of GdCoO3 as a potential SOFC cathode material

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Polyol Synthesis and Investigation of Ce_1−xRE_xO_2−x/2 (RE = Sm, Gd, Nd, La, 0 ≤ x ≤ 0.25) Electrolytes for IT‐SOFCs

Polyol Synthesis and Investigation of Ce_1−xRE_xO_2−x/2 (RE = Sm, Gd, Nd, La, 0 ≤ x ≤ 0.25) Electrolytes for IT‐SOFCs