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J Phys Chem Lett. 2017 Jan 5;8(1):235-242. doi: 10.1021/acs.jpclett.6b02503. Epub 2016 Dec 19.

Chemically Driven Enhancement of Oxygen Reduction Electrocatalysis in Supported Perovskite Oxides.

Author information

1
Department of Materials Science and Engineering, Yonsei University , Seoul 03722, Republic of Korea.
2
Advanced Analysis Center, Korea Institute of Science and Technology , Seoul 02792, Republic of Korea.
3
Division of Material Science, Korea Basic Science Institute , Daejeon 34133, Republic of Korea.
4
Samsung Advanced Institute of Technology , Gyeonggi-do 16678, Republic of Korea.
5
High Temperature Energy Materials Research Center, Korea Institute of Science and Technology , Seoul 02792, Republic of Korea.

Abstract

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.

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