Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 136-143 |
| Journal | Journal of materials chemistry. A |
| Volume | 2 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2014 |
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Keywords
- IR-87839
- METIS-298915
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Electrical conductivity relaxation of Sr2Fe1.5Mo0.5O6−δ–Sm0.2Ce0.8O1.9 dual-phase composites. / Wang, Yunlong; Hu, Bobing; Zhu, Zhuoying; Bouwmeester, Henricus J.M.; Xia, Changrong.
In: Journal of materials chemistry. A, Vol. 2, No. 1, 2014, p. 136-143.Research output: Contribution to journal › Article › Academic › peer-review
TY - JOUR
T1 - Electrical conductivity relaxation of Sr2Fe1.5Mo0.5O6−δ–Sm0.2Ce0.8O1.9 dual-phase composites
AU - Wang, Yunlong
AU - Hu, Bobing
AU - Zhu, Zhuoying
AU - Bouwmeester, Henricus J.M.
AU - Xia, Changrong
PY - 2014
Y1 - 2014
N2 - The oxygen incorporation kinetics of Sr2Fe1.5Mo0.5O6 d–Sm0.2Ce0.8O1.9 (SFM–SDC) dual-phase composites has been investigated, at 750 C, as a function of SDC phase volume fraction using electrical conductivity relaxation. It is shown that the oxygen re-equilibration kinetics in the range of oxygen partial pressure (pO2) from 0.01 to 1 atm is limited by the surface exchange rate. The effective surface exchange coefficient of the composites is found to increase profoundly upon increasing the phase volume fraction of the oxide electrolyte phase SDC. The results are interpreted to reflect the synergistic oxygen incorporation at the SFM–SDC–gas triple phase boundaries (TPBs), which occurs in addition to the direct incorporation via the surface of the perovskite mixed conductor SFM. Already at a SDC phase volume fraction of 0.105, the uptake of oxygen via the synergistic TPB route (referred to as route III), following a step change in the surrounding pO2, comprises more than 75% of the overall uptake of oxygen by the composite. It is further concluded that under the conditions of the experiments the twophase SFM–SDC boundaries allow for a facile exchange of oxygen ions between both involved phases.
AB - The oxygen incorporation kinetics of Sr2Fe1.5Mo0.5O6 d–Sm0.2Ce0.8O1.9 (SFM–SDC) dual-phase composites has been investigated, at 750 C, as a function of SDC phase volume fraction using electrical conductivity relaxation. It is shown that the oxygen re-equilibration kinetics in the range of oxygen partial pressure (pO2) from 0.01 to 1 atm is limited by the surface exchange rate. The effective surface exchange coefficient of the composites is found to increase profoundly upon increasing the phase volume fraction of the oxide electrolyte phase SDC. The results are interpreted to reflect the synergistic oxygen incorporation at the SFM–SDC–gas triple phase boundaries (TPBs), which occurs in addition to the direct incorporation via the surface of the perovskite mixed conductor SFM. Already at a SDC phase volume fraction of 0.105, the uptake of oxygen via the synergistic TPB route (referred to as route III), following a step change in the surrounding pO2, comprises more than 75% of the overall uptake of oxygen by the composite. It is further concluded that under the conditions of the experiments the twophase SFM–SDC boundaries allow for a facile exchange of oxygen ions between both involved phases.
KW - IR-87839
KW - METIS-298915
U2 - 10.1039/c3ta12787g
DO - 10.1039/c3ta12787g
M3 - Article
VL - 2
SP - 136
EP - 143
JO - Journal of materials chemistry. A
JF - Journal of materials chemistry. A
SN - 2050-7488
IS - 1
ER -