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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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Multi-heteroatom-doped carbon from waste-yeast biomass for sustained water splitting

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Title
Multi-heteroatom-doped carbon from waste-yeast biomass for sustained water splitting
Author
Tiwari, Jitendra N.Dang, Ngoc KimSultan, SirajThangavel, PandiarajanJeong, Hu YoungKim, Kwang S.
Issue Date
2020-07
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE SUSTAINABILITY , v.3, no.7, pp.556-+
Abstract
Producing hydrogen in clean, affordable and safe manners without damaging the environment can help address the challenge of meeting a growing energy demand sustainably. Yeast biomass-derived materials-such as multi-heteroatoms (nitrogen, sulfur and phosphorus) doped carbon (MHC) catalysts from waste biomass-can help develop efficient, eco-friendly and economical catalysts to improve the sustainability of hydrogen production. Here we report hydrogen and oxygen production in 1 M potassium hydroxide using ruthenium single atoms (RuSAs) along with Ru nanoparticles (RuNPs) embedded in MHC (RuSAs + RuNPs@MHC) as a cathode and magnetite (Fe3O4) supported on MHC (Fe3O4@MHC) as an anode. The RuSAs + RuNPs@MHC catalyst outperforms the state-of-the-art commercial platinum on carbon catalyst for hydrogen evolution reaction in terms of overpotential, exchange current density, Tafel slope and durability. Furthermore, compared with industrially adopted catalysts (that is, iridium oxide), the Fe3O4@MHC caalyst displays outstanding oxygen evolution reaction activity. For whole water splitting, it requires a solar voltage of 1.74 V to drive 30 mA, along with remarkable long-term stability in the presence (12 h) and absence (58 h) of outdoor-sunlight exposure, as a promising strategy towards a sustainable energy development. Cleaner hydrogen production can help energy sustainability. The use of yeast biomass-derived materials to develop efficient, eco-friendly and economical catalysts-compared with industrially adopted catalysts-is shown to improve hydrogen production as a strategy towards a sustainable energy system.
URI
https://scholarworks.unist.ac.kr/handle/201301/31990
URL
https://www.nature.com/articles/s41893-020-0509-6
DOI
10.1038/s41893-020-0509-6
ISSN
2398-9629
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CHM_Journal Papers
UCRF_Journal Papers
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