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Cho, Jaephil
Nano Energy Storage Materials Lab (NESM)
Research Interests
  • Li-ion battery, metal-air battery, redox-flow battery, flexible battery .

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Tunable Internal and Surface Structures of the Bifunctional Oxygen Perovskite Catalysts

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Title
Tunable Internal and Surface Structures of the Bifunctional Oxygen Perovskite Catalysts
Author
Jung, Jae-IlPark, SeungkyuKim, Min-GyuCho, Jaephil
Issue Date
2015-12
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED ENERGY MATERIALS, v.5, no.24, pp.1501560
Abstract
Perovskite oxide ceramics attracts significant attention as a strong candidate of bifunctional oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) electrocatalyst for the metal-air batteries. Numerous approaches to the viability of bifunctional perovskite electrocatalyst represent that the electrochemical performance is highly correlated with defect chemistry, surface structure, and overall polycrystalline perovskite structure. By making use of the intrinsic flexibility of internal structure and high nonstoichiometry in perovskite oxide, the heat treatment effect of the complex Ba0.5Sr0.5CoxFe1-xO3- (x = 0.2 and 0.8) perovskites in argon atmosphere at 950 degrees C (Ar-BSCF5582 and Ar-BSCF5528) on the surface structure/defect chemistry and electrocatalytic performance is intensively investigated. Upon heat-treatment in argon atmosphere, the amorphous thickness layer increases from approximate to 20 to 180-200 nm in BSCF5582, while there is little change in BSCF5528 with approximate to 20 nm. The electrocatalytic performance of BSCF5582 catalyst both in ORR and OER deteriorates seriously, while Ar-BSCF5528 demonstrates a significant increase of electrochemical performance in ORR. This study demonstrates that the electrochemical performances of a perovskite catalyst can be significantly determined by the simultaneous modification of both surface structure and internal defect chemistry, which are explained with transmission electron microscopy and atomic-selective X-ray absorption fine structure analyses, respectively.
URI
https://scholarworks.unist.ac.kr/handle/201301/18179
URL
http://onlinelibrary.wiley.com/doi/10.1002/aenm.201501560/abstract
DOI
10.1002/aenm.201501560
ISSN
1614-6832
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