Effect of samaria-doped ceria (SDC) interlayer on the performance of La0.6Sr0.4Co0.2Fe0.8O3-δ/SDC composite oxygen electrode for reversible solid oxide fuel cells
| Autor: | Hanako Nishino, Manuel E. Brito, Hiroyuki Uchida, Katsuyoshi Kakinuma, Kazuki Shimura |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
020209 energy General Chemical Engineering Inorganic chemistry Oxide chemistry.chemical_element 02 engineering and technology Electrolyte 021001 nanoscience & nanotechnology Anode law.invention chemistry.chemical_compound Cerium chemistry law Electrode 0202 electrical engineering electronic engineering information engineering Electrochemistry Solid oxide fuel cell 0210 nano-technology Clark electrode Yttria-stabilized zirconia |
| Zdroj: | Electrochimica Acta. 225:114-120 |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2016.12.100 |
| Popis: | In order to establish clear criteria for designing highly active and highly durable oxygen electrode for reversible solid oxide fuel cells, we have focused on the effect of samaria-doped ceria (SDC) interlayers prepared on YSZ solid electrolyte surface on the performances of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF)-SDC composite oxygen electrode. Symmetrical cells with the configuration, LSCF-SDC|SDC interlayer|YSZ|SDC interlayer|LSCF-SDC, were constructed. We prepared two kinds of SDC interlayers, one from a mixed solution of cerium 2-ethylhexanoate (denoted as octoate) and samarium octoates (o-interlayer) and another from a mixed solution of cerium and samarium nitrates (n-interlayer). The LSCF-SDC electrodes with o-interlayer and n-interlayer exhibited very similar performances in both the anodic and cathodic reactions at 900 °C. When temperature was decreased to 800 °C, an increase in overpotentials was observed. However, the LSCF-SDC electrode with o-interlayer exhibited superior performance to that with n-interlayer. It was found that the entire surface of the YSZ electrolyte disk was well covered with a dense o-interlayer of uniform thickness. Such an interlayer enables uniform transport of oxide ions to and from the LSCF-SDC electrode, resulting in an enlarged effective reaction zone (ERZ). The I-E performance of the LSCF-SDC|o-interlayer|YSZ cell was found to be comparable to that of the identical electrode prepared on a dense SDC sintered electrolyte disk (as a reference). This observation supports our views regarding the essential role of a dense interlayer with uniform thickness in enhancing the performance of reversible solid oxide cells. |
| Databáze: | OpenAIRE |
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