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Influence of Surface Orientation on the Catalytic Activities of La 0.8 Sr 0.2 CoO 3 Crystal Electrodes for Oxygen Reduction and Evolution Reactions
Author(s) -
Miyahara Yuto,
Miyazaki Kohei,
Fukutsuka Tomokazu,
Abe Takeshi
Publication year - 2016
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500439
Subject(s) - oxygen , electrocatalyst , oxygen evolution , electrode , crystal (programming language) , oxygen reduction , catalysis , single crystal , materials science , carbon fibers , crystallography , orientation (vector space) , chemistry , analytical chemistry (journal) , electrochemistry , geometry , composite material , biochemistry , organic chemistry , chromatography , composite number , computer science , programming language , mathematics
We investigated the influence of the surface orientation of La 0.8 Sr 0.2 CoO 3 (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.