Influence of Surface Orientation on the Catalytic Activities of La0.8Sr0.2CoO3 Crystal Electrodes for Oxygen Reduction and Evolution Reactions.

Autor: Miyahara, Yuto, Miyazaki, Kohei, Fukutsuka, Tomokazu, Abe, Takeshi
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Zdroj: ChemElectroChem; Feb2016, Vol. 3 Issue 2, p214-217, 4p
Abstrakt: We investigated the influence of the surface orientation of La0.8Sr0.2CoO3 (LSCO) on the catalytic activities for oxygen evolution and reduction reactions in alkaline solutions when using single crystals of LSCO. When LSCO single-crystal rods are sliced along the (001), (110), and (111) planes of a high-temperature cubic structure, we obtain crystal electrodes that can be denoted (001)C, (110)C, and (111)C, respectively. The catalytic activities for oxygen evolution occur in the order (110)C> (001)C≈(111)C. Although the currents for oxygen reduction on LSCO single crystals are hardly observed, their activities are enhanced when carbon is placed on the crystal surfaces. These results clearly show that the oxygen evolution activities of LSCO electrodes are dependent on their crystal planes, whereas their oxygen reduction activities rely on the interplay between carbon and LSCO. These findings may contribute toward the development of an effective electrocatalyst for rechargeable air electrodes. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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