Effect of doping with Co2O3, TiO2, Fe2O3, and Mn2O3 on the properties of Ce0.8Gd0.2O2−δ

Pikalova, E. Yu.; Demina, A. N.; Demin, A.; Мурашкина, А. А.; Sopernikov, V. E.; Esina, N. O.

doi:10.1134/s0020168507070126

Cited by 26 publications

(23 citation statements)

References 17 publications

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“…Co, Fe or Cu oxide addition, 32 but a slight decrease of electrical conductivity for addition of Mn oxide. 33,34 In contrast, a significant deviation can be seen in the temperature range 200-400…”

Section: Resultsmentioning

confidence: 80%

“…Obviously, the amount of incorporated metal cations as well as their valence in sintered ceria depends strongly on the preparation method, sintering temperature and co-dopant concentrations 28,32,33 which underlines the importance of an investigation of charge carrier transport for materials with a standardized (commercial) ceria host matrix.…”

Section: F534mentioning

confidence: 99%

“…Avila-Paredes et al and other groups found out that the introduction of small amounts of Fe, Co, Mn, or Cu to Gd-doped ceria results in significant reduction of the grain boundary resistivity of the samples [30][31][32][33] while the total conductivity remains nearly similar or is even reduced in case of Mn. 33,34 Especially Co 32,35,36 and Fe, 32,[36][37][38] but to a lesser extent also Mn, 28,38,39 Ni, 36,38 Cu 32,38 and Zn 40,41 have besides been reported to facilitate the sintering of ceria ceramics while Cr, in contrast, was observed to suppress the sinterability of ceria. 31,35 At the same time, * Electrochemical Society Member.…”

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confidence: 99%

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Assessment of the Effect of Transition Metal Oxide Addition on the Conductivity of Commercial Gd-Doped Ceria

Neuhaus¹,

Dolle²,

Wiemhöfer³

2018

J. Electrochem. Soc.

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The effect of addition of transition metal oxides on the charge transport of commercially available Gd-doped ceria (Ce 0.9 Gd 0.1 O 2-δ ) was assessed with special emphasis on the electronic partial conductivity. The samples were doped by adding 2, 4 or 6 cat% of CoO 3/4 or FeO 2/3 , or 2 mol% of the transition metal oxides V 2 O 5 , MnO 2 , and CuO, respectively. It was found that even small amounts of transition metal oxides severely change the partial electronic conductivity of ceria while the majority oxygen ion conductivity was only mildly affected: for high oxygen ion conductivity, Fe or Mn oxide addition as well as small amounts of Co oxide are beneficial, as especially the grain boundary conductivity is slightly increased. Addition of V or Cu oxide in contrast increases the minority charge carrier conductivity of electrons and thus enhances the mixed ionic-electronic conductivity. For Co oxide addition, an increasing electronic conductivity with decreasing oxygen partial pressure from 10 −8 to 10 −4 bar at temperatures below 600 • C indicates the changing redox state of Co from divalent at low oxygen partial pressures to trivalent under ambient oxygen partial pressure.

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Section: Resultsmentioning

confidence: 80%

Section: F534mentioning

confidence: 99%

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confidence: 99%

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Assessment of the Effect of Transition Metal Oxide Addition on the Conductivity of Commercial Gd-Doped Ceria

Neuhaus¹,

Dolle²,

Wiemhöfer³

2018

J. Electrochem. Soc.

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“…So far, the effect of Mn addition has mostly been investigated using Mn as a co-dopant or rather sintering additive [7][8][9][10]. Mainly Gd 2 O 3 [7,10,11], but in some cases also other oxides [1], were used as main dopants to fix the oxygen vacancy concentration of the material.…”

Section: Introductionmentioning

confidence: 99%

“…Mainly Gd 2 O 3 [7,10,11], but in some cases also other oxides [1], were used as main dopants to fix the oxygen vacancy concentration of the material. The solubility limit of Mn in pure ceria has been found to be in the range between 5-10 mol % [7,8,12], or <1 mol % in another study [13].…”

Section: Introductionmentioning

confidence: 99%

Effect of MnO2 Concentration on the Conductivity of Ce0.9Gd0.1MnxO2−δ

et al. 2018

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Samples with the composition Ce 0.9 Gd 0.1 Mn x O 2−δ with x = 0.01, 0.02, and 0.05 Mn-addition were prepared by mixed oxide route from Ce 0.9 Gd 0.1 O 2−δ and MnO 2 and sintered at 1300 • C. The electronic conductivity was measured using a modified Hebb-Wagner technique, the electrical conductivity was investigated by impedance spectroscopy, and oxygen permeation was measured for the sample with x = 0.05. An increase of the electronic partial conductivity with increasing Mn addition was observed, which can be attributed to an additional Mn 3d-related state between the top of the valence band and the bottom of the Ce 4f band. The grain boundary conductivity was found to be suppressed for low Mn contents, but enhanced for the sample with x = 0.05.

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Materials development for intermediate-temperature solid oxide electrochemical devices

et al. 2012

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Effect of doping with Co2O3, TiO2, Fe2O3, and Mn2O3 on the properties of Ce0.8Gd0.2O2−δ

Cited by 26 publications

References 17 publications

Assessment of the Effect of Transition Metal Oxide Addition on the Conductivity of Commercial Gd-Doped Ceria

Assessment of the Effect of Transition Metal Oxide Addition on the Conductivity of Commercial Gd-Doped Ceria

Effect of MnO2 Concentration on the Conductivity of Ce0.9Gd0.1MnxO2−δ

Materials development for intermediate-temperature solid oxide electrochemical devices

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