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Cho, Jaephil
Nano Energy Storage Material Lab.
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Unveiling the Catalytic Origin of Nanocrystalline Yttrium Ruthenate Pyrochlore as a Bifunctional Electrocatalyst for Zn-Air Batteries

Author(s)
Park, JoohyukPark, MinjoonNam, GyutaeKim, Min GyuCho, Jaephil
Issued Date
2017-06
DOI
10.1021/acs.nanolett.7b01812
URI
https://scholarworks.unist.ac.kr/handle/201301/22313
Fulltext
http://pubs.acs.org/doi/abs/10.1021/acs.nanolett.7b01812
Citation
NANO LETTERS, v.17, no.6, pp.3974 - 3981
Abstract
Zn-air batteries suffer from the slow kinetics of oxygen reduction reaction (ORR) and/or oxygen evolution reaction (OER). Thus, the bifunctional electrocatalysts are required for the practical application of rechargeable Zn-air batteries. In terms of the catalytic activity and structural stability, pyrochlore oxides (A2[B2-xAx]O7-y) have emerged as promising candidates. However, a limited use of A-site cations (e.g., lead or bismuth cations) of reported pyrochlore catalysts have hampered broad understanding of their catalytic effect and structure. More seriously, the catalytic origin of the pyrochlore structure was not clearly revealed yet. Here, we report the new nanocrystalline yttrium ruthenate (Y2[Ru2-xYx]O7-y) with pyrochlore structure. The prepared pyrochlore oxide demonstrates comparable catalytic activities in both ORR and OER, compared to that of previously reported metal oxide-based catalysts such as perovskite oxides. Notably, we first find that the catalytic activity of the Y2[Ru2-xYx]O7-y is associated with the oxidations and corresponding changes of geometric local structures of yttrium and ruthenium ions during electrocatalysis, which were investigated by in situ X-ray absorption spectroscopy (XAS) in real-time. Zn-air batteries using the prepared pyrochlore oxide achieve highly enhanced charge and discharge performance with a stable potential retention for 200 cycles.
Publisher
AMER CHEMICAL SOC
ISSN
1530-6984
Keyword (Author)
Pyrochlore oxideyttrium ruthenatebifunctional electrocatalystsin situ XAScatalytic originZn-air batteries
Keyword
RAY-ABSORPTION SPECTROSCOPYOXYGEN REDUCTION REACTIONNEAR-EDGE STRUCTUREHIGH-PERFORMANCEEVOLUTION REACTIONSFUEL-CELLSMETALNANOPARTICLESPEROVSKITESPRINCIPLES

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