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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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Metal-free Ketjenblack incorporated nitrogen-doped carbon sheets derived from gelatin as oxygen reduction catalysts

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Title
Metal-free Ketjenblack incorporated nitrogen-doped carbon sheets derived from gelatin as oxygen reduction catalysts
Author
Nam, GyutaePark, JoohyukKim, Sun TaiShin, Dong-binPark, NoejungKim, YoungsikLee, Jang-SooCho, Jaephil
Issue Date
2014-04
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.14, no.4, pp.1870 - 1876
Abstract
Electrocatalysts facilitating oxygen reduction reaction (ORR) are vital components in advanced fuel cells and metal-air batteries. Here we report Ketjenblack incorporated nitrogen-doped carbon sheets derived from gelatin and apply these easily scalable materials as metal-free electrocatalysts for ORR. These carbon nanosheets demonstrate highly comparable catalytic activity for ORR as well as better durability than commercial Vulcan carbon supported Pt catalysts in alkaline media. Physico-chemical characterization and theoretical calculations suggest that proper combination of graphitic and pyridinic nitrogen species with more exposed edge sites effectively facilitates a formation of superoxide, [O2(ad)]-, via one-electron transfer, thus increasing catalytic activities for ORR. Our results demonstrate a novel strategy to expose more nitrogen doped edge sites by irregular stacked small sheets in developing better electrocatalysts for Zn-air batteries. These desirable architectures are embodied by an amphiphlilic gelatin mediated compatible synthetic strategy between hydrophobic carbon and aqueous water.
URI
https://scholarworks.unist.ac.kr/handle/201301/4462
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84898004752
DOI
10.1021/nl404640n
ISSN
1530-6984
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PHY_Journal Papers
ECHE_Journal Papers
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