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Jeong, Hu Young
UNIST Central Research Facilities (UCRF)
Research Interests
  • Soft material characterization such as graphene using a low kV Cs-corrected TEM
  • Insitu-TEM characterization of carbon-based materials using nanofactory STM holder for Li-ion battery application
  • Structural characterization of mesoporous materials using SEM & TEM
  • Interface analysis between various oxides and metals through Cs-corrected (S)TEM
  • Resistive switching mechanism of graphene oxide thin films for RRAM application

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Immobilizing single atom catalytic sites onto highly reduced carbon hosts: Fe-N-4/CNT as a durable oxygen reduction catalyst for Na-air batteries

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Title
Immobilizing single atom catalytic sites onto highly reduced carbon hosts: Fe-N-4/CNT as a durable oxygen reduction catalyst for Na-air batteries
Author
Noh, Woo YeongKim, Eun MiKim, Kwang YoungKim, Jin HyunJeong, Hu YoungSharma, PankajLee, GeunsikJang, Ji-WookJoo, Sang HoonLee, Jae Sung
Issue Date
2020-09
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.8, no.36, pp.18891 - 18902
Abstract
Immobilizing metal ions on a carbon support usually involves severe aggregation (sintering) and loose attachment of metal ions owing to a weak metal-support interaction. Here, we propose an alternative synthetic strategy termed 'selective microwave annealing' (SMA) to stabilize abundant single atom catalytic sites onto a highly reduced form of carbon host with only a few minutes of microwave irradiation. Thus, nitrogen-coordinated single atom iron sites on a carbon nanotube (Fe-N-4/CNT) synthesizedviaSMA show unprecedented oxygen reduction reaction (ORR) activity and pH-universal durability superior to those of thermally annealed Fe-N-4/CNT and expensive Pt/C catalysts. Furthermore, an aqueous Na-air battery with our Fe-N-4/CNT catalyst operates as effectively as the device with the Pt/C catalyst. The method provides a new concept for the design of various strongly coupled and highly dispersed carbon-supported catalysts, which could open up new avenues for use in a wide range of electrochemical and catalytic applications.
URI
https://scholarworks.unist.ac.kr/handle/201301/48299
URL
https://pubs.rsc.org/en/content/articlelanding/2020/ta/d0ta06489k#!divAbstract
DOI
10.1039/d0ta06489k
ISSN
2050-7488
Appears in Collections:
CHM_Journal Papers
UCRF_Journal Papers
ECHE_Journal Papers
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