Ionic conductivity in the CeO2–Gd2O3 system (0.05≤Gd/Ce≤0.4) prepared by oxalate coprecipitation

Zhang, Tianshu; Hing, Peter; Huang, Haitao; Kilner, John A.

doi:10.1016/s0167-2738(02)00121-2

Cited by 262 publications

(173 citation statements)

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“…There are different types of solid oxide fuel cell electrolytes like solid oxide electrochemical cells [1,2] and solid oxide fuel cells [3], of these tetragonal or cubic yttrium stabilized zirconia (YSZ) is the most common electrolyte used in commercial SOFC's [4,5]. YSZ exhibits highest ionic conductivity at 1000…”

Section: Introductionmentioning

confidence: 99%

Electrical Properties of Co-Doped Ceria Electrolyte Ce_0.8-xGd_0.2Sr_xO_2-δ(0.0 ≤ x ≤ 0.1)

Ramesh

Reddy

2009

Acta Phys. Pol. A

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Effects of strontium doping on electrical properties of gadolinium-doped ceria were investigated. The Ce 0.8−x Gd 0.2 Sr x O 2−δ (0.0 ≤ x ≤ 0.1) compositions were prepared by sol-gel method and sintered at 1300• C for 8 h, the bulk densities were over 93% of theoretical density. These results were consistent with scanning electron microscope. The crystallite size of these materials was determined using the X-ray powder diffractometer and the sizes range from 19.4 nm to 24.4 nm. From the experimental results, it was observed that the composition Ce 0.8−x Gd 0.2 Sr x O 2−δ (x = 0.02) exhibits higher conductivity (23.6 × 10 −3 S cm −1 ) and minimum activation energy (0.83 eV) at 700• C. This composition is thus a potential candidate for use as electrolyte applications in intermediate temperature solid oxide fuel cells.

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Section: Introductionmentioning

confidence: 99%

Electrical Properties of Co-Doped Ceria Electrolyte Ce_0.8-xGd_0.2Sr_xO_2-δ(0.0 ≤ x ≤ 0.1)

Ramesh

Reddy

2009

Acta Phys. Pol. A

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“…É bem estabelecido na literatura que SiO 2 é a principal impureza da céria que gera um filme fino ao longo do contorno de grão durante a sinterização. Este filme bloqueia o movimento dos portadores de carga através do contorno reduzindo a condutividade total [13]. A fase silicosa é muito dinâmica em natureza (amorfa ou cristalina), composição, localização e viscosidade.…”

Section: Vacâncias De Oxigênio V Ounclassified

Eletrólitos de céria dopada com Gd2O3 para pilhas a combustível de óxido sólido

Crochemore

Souza

2009

Matéria (Rio J.)

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Este trabalho investigou a condutividade elétrica e a microestrutura de amostras com composições Ce1-xGd xO2-δ (x = 0, 5, 10 e 15%em mol) preparadas com CeO2 com 99,9% pureza. A sinterização de corpos de prova obtidos por prensagem isostática foi realizada ao ar a 1450 ºC por 2 e 10 horas de patamar e a 1500 ºC por 8 horas de patamar. Amostras sinterizadas foram caracterizadas por microscopia eletrônica de varredura e espectroscopia de impedância entre 200-600ºC e na faixa de freqüência 5Hz-13MHz. A sinterização ocorreu via fase líquida e amostras sinterizadas a 1450 °C com 10 h apresentaram densidade superior a 97 %. A maior condutividade elétrica do grão foi obtida para amostra contendo 10 mol Gd2O3 e sinterizada a 1500 °C - 8 h. A condutividade elétrica do contorno de grão apresentou aumento sistemático com o aumento do teor de Gd2O3 sendo que a composição CeGdO15 (com 15% de Gd2O3) sinterizada a 1450 °C - 10 h apresentou a maior condutividade total.

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“…In the last forty years, the conductivity of solely Gd [2,8,11,12] or Pr doped ceria [13][14][15][16] as well as the co-doped system Ce 1-(x+y) Gd x Pr y O 2-δ [17][18][19][20][21] or other acceptor dopant/Pr co-doped systems [22] have been well investigated in the high temperature regime above 600 °C. Especially co-doped systems are of high interest for further improving the performance ceria-based materials especially for use in solid oxide fuel cells and for oxygen permeable membranes.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Charge Transport in Ce_0.8Gd_0.2-xPr_xO_2-δatT≤ 600°C

Neuhaus¹,

Eickholt²,

Maheshwari³

et al. 2017

J. Electrochem. Soc.

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Doped ceria pellets with the composition Ce 0.8 Gd 0.2-x Pr x O 2-δ with x = 0.15, 0.1, 0.05, and 0.03 were investigated with a special focus on the partial conductivities in the temperature range of 200-600 °C. Temperature dependent conductivity provided by impedance spectroscopy in air was compared to measurements of the oxygen partial pressure dependent electronic conductivity. The electronic conductivity was analyzed down to 200 °C by using a modified Hebb-Wagner setup with encapsulated Pt microcontacts. A small polaron hopping process introduced by reduction of praseodymium was found to have a pronounced influence on the electronic conductivity at low temperatures. A splitting of the maximum introduced by praseodymium small polaron hopping was observed. Especially for the compositions x ≤ 0.1, a strong deviation of the electronic conductivity curves from the standard acceptor doping case was measured due to superimposed electronic conductivity from the Pr 3+/4+ redox reaction.

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Ionic conductivity in the CeO2–Gd2O3 system (0.05≤Gd/Ce≤0.4) prepared by oxalate coprecipitation

Cited by 262 publications

References 10 publications

Electrical Properties of Co-Doped Ceria Electrolyte Ce_0.8-xGd_0.2Sr_xO_2-δ(0.0 ≤ x ≤ 0.1)

Electrical Properties of Co-Doped Ceria Electrolyte Ce_0.8-xGd_0.2Sr_xO_2-δ(0.0 ≤ x ≤ 0.1)

Eletrólitos de céria dopada com Gd2O3 para pilhas a combustível de óxido sólido

Analysis of Charge Transport in Ce_0.8Gd_0.2-xPr_xO_2-δatT≤ 600°C

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Ionic conductivity in the CeO2–Gd2O3 system (0.05≤Gd/Ce≤0.4) prepared by oxalate coprecipitation

Cited by 262 publications

References 10 publications

Electrical Properties of Co-Doped Ceria Electrolyte Ce0.8-xGd0.2SrxO2-δ(0.0 ≤ x ≤ 0.1)

Electrical Properties of Co-Doped Ceria Electrolyte Ce0.8-xGd0.2SrxO2-δ(0.0 ≤ x ≤ 0.1)

Eletrólitos de céria dopada com Gd2O3 para pilhas a combustível de óxido sólido

Analysis of Charge Transport in Ce0.8Gd0.2-xPrxO2-δatT≤ 600°C

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Electrical Properties of Co-Doped Ceria Electrolyte Ce_0.8-xGd_0.2Sr_xO_2-δ(0.0 ≤ x ≤ 0.1)

Electrical Properties of Co-Doped Ceria Electrolyte Ce_0.8-xGd_0.2Sr_xO_2-δ(0.0 ≤ x ≤ 0.1)

Analysis of Charge Transport in Ce_0.8Gd_0.2-xPr_xO_2-δatT≤ 600°C