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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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A Few Atomic FeNbO4 Overlayers on Hematite Nanorods: Microwave-Induced High Temperature Phase for Efficient Photoelectrochemical Water Splitting

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Title
A Few Atomic FeNbO4 Overlayers on Hematite Nanorods: Microwave-Induced High Temperature Phase for Efficient Photoelectrochemical Water Splitting
Author
Zhang, HeminKim, Young KyeongJeong, Hu YoungLee, Jae Sung
Issue Date
2019-02
Publisher
AMER CHEMICAL SOC
Citation
ACS CATALYSIS, v.9, no.2, pp.1289 - 1297
Abstract
Orthorhombic iron niobate (FeNbO4) has a band structure to form an effective heterojunction with hematite to make an efficient photoanode for photoelectrochemical water splitting. However, this high temperature phase is difficult to synthesize by conventional thermal annealing (CTA) without damaging F:SnO2 (FTO) substrate. In contrast, hybrid microwave annealing (HMA) selectively forms a few atomic overlayers of highly crystalline orthorhombic FeNbO4 phase covering hematite nanorods in an extremely short time (2 min) without any FTO damage forming a core-shell-type Fe2O3@FeNbO4 nanorod heterojunction on FTO. At the same time, hematite is codoped naturally with Nb and Sn during the HMA synthesis by diffusion from FeNbO4 and FTO, respectively. The optimized Nb,Sn:Fe2O3@FeNbO4/FTO electrode loaded with NiFeOx cocatalyst achieves a stable photocurrent density of 2.71 mA cm-2 at 1.23 VRHE under simulated sunlight (100 mW cm-2) with ∼100% faradaic efficiency of hydrogen production, which is ∼3.4 times higher than that of bare hematite prepared by CTA (0.8 mA cm-2).
URI
https://scholarworks.unist.ac.kr/handle/201301/25858
URL
https://pubs.acs.org/doi/10.1021/acscatal.8b04034
DOI
10.1021/acscatal.8b04034
ISSN
2155-5435
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UCRF_Journal Papers
ECHE_Journal Papers
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