Electronic and ionic transport in Ce0.8PrxTb0.2-xO2-δ and evaluation of performance as oxygen permeation membranes

Publication: Research - peer-reviewConference article – Annual report year: 2012

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@article{32d924fd079146838bd03edc3ee8e89e,
title = "Electronic and ionic transport in Ce<sub>0.8</sub>Pr<sub>x</sub>Tb<sub>0.2-x</sub>O<sub>2-</sub>δ and evaluation of performance as oxygen permeation membranes",
publisher = "Electrochemical Society, Inc.",
author = "Christodoulos Chatzichristodoulou and Hendriksen, {Peter Vang}",
year = "2012",
doi = "10.1149/1.3701292",
volume = "45",
number = "1",
pages = "45--62",
journal = "E C S Transactions",
issn = "1938-5862",

}

RIS

TY - CONF

T1 - Electronic and ionic transport in Ce<sub>0.8</sub>Pr<sub>x</sub>Tb<sub>0.2-x</sub>O<sub>2-</sub>δ and evaluation of performance as oxygen permeation membranes

A1 - Chatzichristodoulou,Christodoulos

A1 - Hendriksen,Peter Vang

AU - Chatzichristodoulou,Christodoulos

AU - Hendriksen,Peter Vang

PB - Electrochemical Society, Inc.

PY - 2012

Y1 - 2012

N2 - <p>The electronic conductivity of Ce<sub>0.8</sub>Pr<sub>x</sub>Tb<sub>0.2-x</sub>O<sub>2-δ</sub> (x = 0, 0.05, 0.10, 0.15, 0.20) was determined in the oxygen activity range a<sub>O2</sub> ≈ 10<sup>3</sup> to a<sub>O2</sub> ≈ 10<sup>-17</sup> at 700- 900 °C by means of Hebb-Wagner polarisation. The electronic conductivity of all the Ce<sub>0.8</sub>Pr<sub>x</sub>Tb<sub>0.2-x</sub>O<sub>2-δ</sub> compositions was significantly enhanced as compared to that of Ce<sub>0.9</sub>Gd<sub>0.1</sub>O<sub>1.95-δ</sub>, and its value was found to increase with increasing Pr/Tb ratio. The ionic mobility of Ce<sub>0.8</sub>Pr<sub>x</sub>Tb<sub>0.2-x</sub>O<sub>2-δ</sub> is similar to that of Ce<sub>1- 2δ</sub>Gd<sub>2δ</sub>O<sub>2-δ</sub> at the same oxygen vacancy concentration. The calculated oxygen flux of a Ce<sub>0.8</sub>Pr<sub>x</sub>Tb<sub>0.2-x</sub>O<sub>2-δ</sub> membrane is significantly enhanced relative to that of a Ce<sub>0.9</sub>Gd<sub>0.1</sub>O<sub>1.95-δ</sub> membrane at high oxygen activities of the permeate gas (a<sub>O2</sub> <sup>an</sup> &gt; 10<sup>-15</sup>) due to the enhanced electronic conductivity of the Ce<sub>0.8</sub>Pr<sub>x</sub>Tb<sub>0.2-x</sub>O<sub>2-δ</sub> compounds. Interference between the ionic and electronic flows has a significant positive effect on the deliverable oxygen flux, as evaluated for Ce<sub>0.8</sub>Pr<sub>0.2</sub>O<sub>2-δ</sub> (1).</p>

AB - <p>The electronic conductivity of Ce<sub>0.8</sub>Pr<sub>x</sub>Tb<sub>0.2-x</sub>O<sub>2-δ</sub> (x = 0, 0.05, 0.10, 0.15, 0.20) was determined in the oxygen activity range a<sub>O2</sub> ≈ 10<sup>3</sup> to a<sub>O2</sub> ≈ 10<sup>-17</sup> at 700- 900 °C by means of Hebb-Wagner polarisation. The electronic conductivity of all the Ce<sub>0.8</sub>Pr<sub>x</sub>Tb<sub>0.2-x</sub>O<sub>2-δ</sub> compositions was significantly enhanced as compared to that of Ce<sub>0.9</sub>Gd<sub>0.1</sub>O<sub>1.95-δ</sub>, and its value was found to increase with increasing Pr/Tb ratio. The ionic mobility of Ce<sub>0.8</sub>Pr<sub>x</sub>Tb<sub>0.2-x</sub>O<sub>2-δ</sub> is similar to that of Ce<sub>1- 2δ</sub>Gd<sub>2δ</sub>O<sub>2-δ</sub> at the same oxygen vacancy concentration. The calculated oxygen flux of a Ce<sub>0.8</sub>Pr<sub>x</sub>Tb<sub>0.2-x</sub>O<sub>2-δ</sub> membrane is significantly enhanced relative to that of a Ce<sub>0.9</sub>Gd<sub>0.1</sub>O<sub>1.95-δ</sub> membrane at high oxygen activities of the permeate gas (a<sub>O2</sub> <sup>an</sup> &gt; 10<sup>-15</sup>) due to the enhanced electronic conductivity of the Ce<sub>0.8</sub>Pr<sub>x</sub>Tb<sub>0.2-x</sub>O<sub>2-δ</sub> compounds. Interference between the ionic and electronic flows has a significant positive effect on the deliverable oxygen flux, as evaluated for Ce<sub>0.8</sub>Pr<sub>0.2</sub>O<sub>2-δ</sub> (1).</p>

U2 - 10.1149/1.3701292

DO - 10.1149/1.3701292

JO - E C S Transactions

JF - E C S Transactions

SN - 1938-5862

IS - 1

VL - 45

SP - 45

EP - 62

ER -