Chemically Driven Enhancement of Oxygen Reduction Electrocatalysis in Supported Perovskite Oxides
- Chemically Driven Enhancement of Oxygen Reduction Electrocatalysis in Supported Perovskite Oxides
- 채근화; 김주선; 탄재완; 정범균; Aloysius Soon; 안성진; 문주호; 이대희
- Electrocatalysis; Perovskite; Oxygen Reduction
- Issue Date
- Journal of Physical Chemistry Letters
- VOL 8, NO 1-242
- Perovskite oxides have the capacity to efficiently catalyze the oxygen reduction reaction (ORR), which is of fundamental importance for electrochemical energy conversion. While the perovskite catalysts have been generally utilized with a support, the role of the supports, regarded as inert toward the ORR, has been emphasized mostly in terms of the thermal stability of the catalyst system and as an ancillary transport channel for oxygen ions during the ORR. We demonstrate a novel approach to improving the catalytic activity of perovskite oxides for solid oxide fuel cells by controlling the oxygen-ion conducting oxide supports. Catalytic activities of (La0.8Sr0.2)0.95MnO3 perovskite thin-film placed on different oxide supports are characterized by electrochemical impedance spectroscopy and X-ray absorption spectroscopy. These analyses confirm that the strong atomic orbital interactions between the support and the perovskite catalyst enhance the surface exchange kinetics by ∼2.4 times, in turn, improving the overall ORR activity.
- Appears in Collections:
- KIST Publication > Article
- Files in This Item:
There are no files associated with this item.
- RIS (EndNote)
- XLS (Excel)
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.