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Park, Noejung
Computational Physics & Electronic Structure Lab
Research Interests
  • Electronic structure calculation, computational physics, computational material science

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Carbon-Coated Core-Shell Fe-Cu Nanoparticles as Highly Active and Durable Electrocatalysts for a Zn-Air Battery

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Title
Carbon-Coated Core-Shell Fe-Cu Nanoparticles as Highly Active and Durable Electrocatalysts for a Zn-Air Battery
Author
Nam, GyutaePark, JoohyukChoi, MinOh, PilgunPark, SuhyeonKim, Min GyuPark, NoejungCho, JaephilLee, Jang-Soo
Issue Date
2015-06
Publisher
AMER CHEMICAL SOC
Citation
ACS NANO, v.9, no.6, pp.6493 - 6501
Abstract
Understanding the interaction between a catalyst and oxygen has been a key step in designing better electrocatalysts for the oxygen reduction reaction (ORR) as well as applying them in metal-air batteries and fuel cells. Alloying has been studied to finely tune the catalysts’ electronic structures to afford proper binding affinities for oxygen. Herein, we synthesized a noble-metal-free and nanosized transition metal CuFe alloy encapsulated with a graphitic carbon shell as a highly efficient and durable electrocatalyst for the ORR in alkaline solution. Theoretical models and experimental results demonstrated that the CuFe alloy has a more moderate binding strength for oxygen molecules as well as the final product, OH-, thus facilitating the oxygen reduction process. Furthermore, the nitrogen-doped graphitic carbon-coated layer, formed catalytically under the influence of iron, affords enhanced charge transfer during the oxygen reduction process and superior durability. These benefits were successfully confirmed by realizing the catalyst application in a mechanically rechargeable Zn-air battery.
URI
https://scholarworks.unist.ac.kr/handle/201301/16925
URL
http://pubs.acs.org/doi/abs/10.1021/acsnano.5b02266
DOI
10.1021/acsnano.5b02266
ISSN
1936-0851
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PHY_Journal Papers
ECHE_Journal Papers
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