Electrode properties of Co-doped Ca<sub>2</sub>Fe<sub>2</sub>O<sub>5</sub> as new cathode materials for intermediate-temperature SOFCs
| hal.structure.identifier | Key Laboratory of Functional Inorganic Materials Chemistry of Ministry of Education | |
| dc.contributor.author | LI, Qiang | |
| hal.structure.identifier | Key Laboratory of Functional Inorganic Materials Chemistry of Ministry of Education | |
| dc.contributor.author | SUN, Liping | |
| hal.structure.identifier | Key Laboratory of Functional Inorganic Materials Chemistry of Ministry of Education | |
| dc.contributor.author | LIHUA, Huo | |
| hal.structure.identifier | Key Laboratory of Functional Inorganic Materials Chemistry of Ministry of Education | |
| dc.contributor.author | ZHAO, Hui | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | GRENIER, Jean-Claude | |
| dc.date.issued | 2010 | |
| dc.identifier.issn | 0360-3199 | |
| dc.description.abstractEn | Brownmillerite oxide Ca<sub>2</sub>Fe<sub>2−<i>x</i></sub>Co<i><sub>x</sub></i>O<sub>5</sub> (<i>x</i> = 0.2, 0.4, 0.6) was characterized by XRD, SEM and electrochemical impedance spectrum (EIS), respectively. Ca<sub>2</sub>Fe<sub>2−<i>x</i></sub>Co<i><sub>x</sub></i>O<sub>5</sub> has no reaction with Sm<sub>0.2</sub>Ce<sub>0.8</sub>O<sub>1.9</sub> (SDC) electrolyte at 1100 °C for 10 h in air. The thermal expansion coefficient (TEC) of Ca<sub>2</sub>Fe<sub>2−<i>x</i></sub>Co<i><sub>x</sub></i>O<sub>5</sub> increased with increasing Co content, and the TEC value was compatible with SDC. The electrode properties of Ca<sub>2</sub>Fe<sub>2−<i>x</i></sub>Co<i><sub>x</sub></i>O<sub>5</sub> were studied under various temperatures and oxygen partial pressures. The polarization resistance (<i>R</i><sub>p</sub>) of Ca<sub>2</sub>Fe<sub>2−<i>x</i></sub>Co<i><sub>x</sub></i>O<sub>5</sub> with <i>x</i> = 0.2, 0.4 and 0.6 are 0.23, 0.48 and 1.05 Ω cm<sup>2</sup> at 700 °C in air, respectively. The rate-limiting step for oxygen reduction reaction was the charge transfer process. Ca<sub>2</sub>Fe<sub>1.8</sub>Co<sub>0.2</sub>O<sub>5</sub> cathode exhibits the lowest overpotential of about 50 mV at a current density of 70 mA cm<sup>−2</sup> at 700 °C in air. | |
| dc.language.iso | en | |
| dc.publisher | Elsevier | |
| dc.subject.en | Brownmillerite oxide | |
| dc.subject.en | IT-SOFCs | |
| dc.subject.en | Ca2Fe2−xCoxO5 cathodes | |
| dc.title.en | Electrode properties of Co-doped Ca<sub>2</sub>Fe<sub>2</sub>O<sub>5</sub> as new cathode materials for intermediate-temperature SOFCs | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1016/j.ijhydene.2010.06.048 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | International Journal of Hydrogen Energy | |
| bordeaux.page | 9151-9157 | |
| bordeaux.volume | 35 | |
| bordeaux.issue | 17 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00549312 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00549312v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=International%20Journal%20of%20Hydrogen%20Energy&rft.date=2010&rft.volume=35&rft.issue=17&rft.spage=9151-9157&rft.epage=9151-9157&rft.eissn=0360-3199&rft.issn=0360-3199&rft.au=LI,%20Qiang&SUN,%20Liping&LIHUA,%20Huo&ZHAO,%20Hui&GRENIER,%20Jean-Claude&rft.genre=article |
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