New Rhenium-Doped SrCo1−xRexO3−δ Perovskites Performing as Cathodes in Solid Oxide Fuel Cells
Abstract
:1. Introduction
2. Experimental
3. Results and Discussion
3.1. Crystallographic Characterization
3.2. Thermal Analysis, Thermal Expansion Measurements and Chemical Compatibility
3.3. Electrical Conductivity Measurements
3.4. Impedance Spectroscopy Results
3.5. Fuel-Cell Tests
4. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Atoms | Site | x | y | z | Biso (Å2) | Beq (Å2) * | focc |
---|---|---|---|---|---|---|---|
Sr | 2h | 1/2 | 1/2 | 0.2513(9) | 1.14(2) | 1.00 | |
Co1 | 1a | 0 | 0 | 0 | 0.09(4) | 1.00 | |
(Co,Re)2 | 1b | 0 | 0 | 1/2 | 1.23(4) | 0.815(1)/0.185(1) | |
O1 | 2e | 1/2 | 0 | 0 | 1.139 | 0.921(2) | |
O2 | 2g | 0 | 0 | 0.755(1) | 2.227 | 1.00(2) | |
O3 | 2f | 1/2 | 0 | 1/2 | 1.569 | 0.924(2) | |
* Anisotropic Thermal Factors (× 10−4) (β12 = β13 = β23 = 0) | |||||||
Atoms | β11 | β22 | β33 | ||||
O1 | 100(56) | 151(59) | 80(18) | ||||
O2 | 401(30) | β11 | 79(13) | ||||
O3 | 141(60) | 207(67) | 109(20) |
T (°C) | 400 | 600 | 800 | 950 |
---|---|---|---|---|
a (Å) | 3.8979(4) | 3.9221(1) | 3.9460(1) | 3.9641(1) |
V (Å3) | 59.227(1) | 60.333(1) | 61.442(2) | 62.292(2) |
Atoms | ||||
Sr | 1b (½,½,½) | |||
Biso (Å2) | 2.06(5) | 2.59(6) | 3.19(8) | 3.78(9) |
focc | 1.00 | 1.00 | 1.00 | 1.00 |
(Co,Re) | 1a (0,0,0) | |||
Biso (Å2) | 0.50(8) | 1.58(10) | 2.12(13) | 2.52(16) |
focc | 0.9/0.1 | 0.9/0.1 | 0.9/0.1 | 0.9/0.1 |
O | 3d (½, 0, 0) | |||
β11 * | 317(13) | 407(15) | 534(19) | 655(22) |
β22 = β33 * | 438(8) | 638(10) | 801(12) | 943(14) |
Beq (Å2) | 2.415 | 3.461 | 4.456 | 5.324 |
focc | 2.733(2) | 2.708(3) | 2.649(34) | 2.566(36) |
Reliability factors | ||||
χ2 | 2.49 | 1.56 | 1.40 | 1.37 |
Rp (%) | 1.60 | 1.40 | 1.33 | 1.31 |
Rwp (%) | 2.16 | 1.79 | 1.67 | 1.65 |
RBragg (%) | 1.65 | 2.52 | 2.11 | 2.14 |
Bond distances (Å) | ||||
(Co,Re)–O (x6) | 1.94899(2) | 1.96105(2) | 1.97299(4) | 1.98205(5) |
700 °C | 800 °C | 850 °C | |
---|---|---|---|
SrCoO3−δ | |||
R1/ASR (Ω·cm2) | 4.065 | 0.592 | 0.326 |
SrCo0.95Re0.05O3−δ | |||
R1 (Ω·cm2) | 0.072 | 0.018 | 0.047 |
R2 (Ω·cm2) | 0.585 | 0.102 | 0.033 |
ASR (Ω·cm2) | 0.658 | 0.120 | 0.080 |
SrCo0.9Re0.1O3−δ | |||
R1 (Ω·cm2) | 0.035 | 0.127 | 0.066 |
R2 (Ω·cm2) | 0.565 | ||
ASR (Ω·cm2) | 0.600 | 0.127 | 0.066 |
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Troncoso, L.; Gardey, M.C.; Fernández-Díaz, M.T.; Alonso, J.A. New Rhenium-Doped SrCo1−xRexO3−δ Perovskites Performing as Cathodes in Solid Oxide Fuel Cells. Materials 2016, 9, 717. https://doi.org/10.3390/ma9090717
Troncoso L, Gardey MC, Fernández-Díaz MT, Alonso JA. New Rhenium-Doped SrCo1−xRexO3−δ Perovskites Performing as Cathodes in Solid Oxide Fuel Cells. Materials. 2016; 9(9):717. https://doi.org/10.3390/ma9090717
Chicago/Turabian StyleTroncoso, Loreto, María Celeste Gardey, María Teresa Fernández-Díaz, and José Antonio Alonso. 2016. "New Rhenium-Doped SrCo1−xRexO3−δ Perovskites Performing as Cathodes in Solid Oxide Fuel Cells" Materials 9, no. 9: 717. https://doi.org/10.3390/ma9090717