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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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Unveiling the critical role of active site interaction in single atom catalyst towards hydrogen evolution catalysis

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Title
Unveiling the critical role of active site interaction in single atom catalyst towards hydrogen evolution catalysis
Author
Li, FengHan, Gao-FengBu, YunfeiChen, ShanshanAhmad, IshfaqJeong, Hu YoungFu, ZhengpingLu, YalinBaek, Jong-Beom
Issue Date
2022-03
Publisher
ELSEVIER
Citation
NANO ENERGY, v.93, pp.106819
Abstract
Single atom catalysts (SACs) with efficient active sites are considered as valuable candidates to replace traditional catalysts. Fundamental insights into the interaction between single atom active sites, and its effect on the catalytic performance are still rare. Herein, we demonstrate the critical role of active site interaction in the intrinsic activity of SACs during acidic hydrogen evolution catalysis. Different amounts of platinum (Pt) atoms were atomically dispersed on graphitic carbon supports (PtSACs) to vary the spatial distance and thus the interaction between active sites. Remarkably, the PtSAC with improved active site interaction exhibited significantly enhanced intrinsic activity towards acidic hydrogen evolution (e.g., a high turnover frequency of 8.01 H2 s−1 at 20 mV), surpassing commercial Pt/C and other reported outstanding catalysts. Theoretical calculations further revealed that the increasing interaction between single atom active sites can largely modify their electronic configurations and result in more favored hydrogen adsorption/desorption behaviors, which is responsible for the enhanced intrinsic activity towards hydrogen evolution catalysis.
URI
https://scholarworks.unist.ac.kr/handle/201301/55860
URL
https://www.sciencedirect.com/science/article/pii/S2211285521010685?via%3Dihub
DOI
10.1016/j.nanoen.2021.106819
ISSN
2211-2855
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