Simultaneous A- and B- site substituted double perovskite (AA’B2O5+) as a new high-performance and redox-stable anode material for solid oxide fuel cells
| Autor: | Jong Hoon Joo, Seung Jae Son, Dongyoung Kim, Daae Lee, Young-il Kwon, Jou-Hyeon Ahn, Younki Lee |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Reducing atmosphere Analytical chemistry Oxide Energy Engineering and Power Technology 02 engineering and technology Electrolyte Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Redox Cathode 0104 chemical sciences law.invention Anode chemistry.chemical_compound chemistry law Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Journal of Power Sources. 434:226743 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2019.226743 |
| Popis: | In this study, a novel PrBa0.5Sr0.5Fe2-xGexO5+δ (PBSFG) double perovskite is first introduced by the co-substitution of Sr for A-sites and Ge for B-sites as a high-performance and redox-stable anode material for solid oxide fuel cells. The modification of the A-sites of PrBaFe2O5+δ by Sr-doping (PBSF) significantly enhances electrical conductivity of PBSF under a reducing atmosphere by several orders of magnitude at 800 °C. Subsequently, Ge-doping on B-sites leads to meaningful increases in oxygen ion conductivity of PBSFG, and is owing to increases in the oxygen vacancy concentration. The electrochemical performances of PBSFG-Ce0.9Gd0.1O2-δ (GDC) are evaluated using a composite anode with a GDC|Zr0.79Sc0.2Ce0.01O2-δ (ScSZ)|GDC electrolyte (~100 μm) and a La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathode. The cell shows critical improvement in the maximum power density (838.4 mW cm−2 at 800 °C) relative to the PrBaFe2O5+δ composite (497.6 mW cm−2). Moreover, it shows good redox-cycle stability from fuel to air under a current load. |
| Databáze: | OpenAIRE |
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