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

Neuhaus, Kerstin; Eickholt, Sebastian; Maheshwari, Aditya V.; Schulze‐Küppers, Falk; Baumann, Stefan; Wiemhöfer, Hans‐Dieter

doi:10.1149/2.0931707jes

Cited by 6 publications

(3 citation statements)

References 36 publications

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“…23,24 Pr as a redox active material also provides an additional oxygen partial pressure dependent maximum of the electronic conductivity due to the reduction from Pr 4+ to Pr 3+ and a related polaron hopping mechanism within a certain oxygen partial pressure range. 23,25,26 A comparable effect has also been confirmed for Mn doping in YSZ or ceria after sintering at certain temperatures to preserve the Mn 3+ state within the material [27][28][29] and is also conceivable for other redox-active transition metal cations.…”

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confidence: 65%

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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confidence: 65%

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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“…23,24 Pr as a redox active material also provides an additional oxygen partial pressure dependent maximum of the electronic conductivity due to the reduction from Pr 4+ to Pr 3+ and a related polaron hopping mechanism within a certain oxygen partial pressure range. 23,[25][26][27] A comparable effect has also been confirmed for Mn doping in YSZ or ceria after sintering at certain temperatures to preserve the Mn 3+ state within the material [28][29][30] and is also conceivable for other redox-active transition metal cations.…”

mentioning

confidence: 66%

The Effect of Transition Metal Oxide Addition on the Conductivity of Commercially Available Gd-Doped Ceria

Neuhaus

Dolle

Wiemhöfer

2020

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 (Ce0.9Gd0.1O2−δ ) was assessed with special emphasis on the electronic partial conductivity. The samples were doped by adding 2, 4 or 6 cat% of CoO 4 / 3 or FeO 3 / 2 , or 2 mol% of the transition metal oxides V2O5, MnO2, and CuO, respectively. All samples with transition metal oxides showed predominant ionic conductivity at high temperatures and for all materials except for MnO2 addition, the electrical conductivity was slightly increased at temperatures ≤500 °C compared to pure CGO. For Co other than for Fe addition, the electronic conductivity strongly depends on the Co concentration. Also 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. Additionally, it was found that 2 mol% of CuO already lead to a significantly decreased blocking effect of the grain boundaries in the temperature range below 500 °C.

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“…As no additional maximum of the electronic conductivity was found in the oxygen partial pressure range between 10 −4 and 10 −7 bar [17] (which would be the case if predominantly trivalent or tetravalent Mn was existing in the samples and would be reduced during Hebb-Wagner measurements), Mn exists predominantly in a Mn 2+ state, as initially assumed [9]. Reduction of Mn 3+ or Mn 4+ would hypothetically lead to a small polaron hopping process, which could be comparable to the effect of the reduction process of Pr 3+/4+ [31], but this mechanism was not observed.…”

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confidence: 90%

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

Cited by 6 publications

References 36 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

The Effect of Transition Metal Oxide Addition on the Conductivity of Commercially Available Gd-Doped Ceria

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

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