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Kwak, Sang Kyu
Kyu’s MolSim Lab @ UNIST
Research Interests
  • Molecular modeling and simulation, statistical thermodynamics, molecular physics

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Precisely-controlled, a few layers of iron titanate inverse opal structure for enhanced photoelectrochemical water splitting

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Title
Precisely-controlled, a few layers of iron titanate inverse opal structure for enhanced photoelectrochemical water splitting
Author
Zhang, HeminPark, Sung O.Joo, Se HunKim, Jin HyunKwak, Sang KyuLee, Jae Sung
Issue Date
2019-08
Publisher
Elsevier Ltd
Citation
NANO ENERGY, v.62, pp.20 - 29
Abstract
Iron titanate (Fe 2 TiO 5 ) is a promising photoanode material due to a narrow band gap, appropriate band edges, robustness and abundance. However, its performance is limited because of its low conductivity and short hole diffusion length. Precisely controlled, a few Fe 2 TiO 5 layers of inverse opal structure (IOS) is fabricated via a layer-by-layer self-assembly and then treated by hybrid microwave annealing to produce a highly crystalline, yet IOS morphology-preserved Fe 2 TiO 5 photoanode film for solar water splitting. The highly transparent Fe 2 TiO 5 IOS film shows a greatly enhanced visible light harvesting, higher density of catalytically more active crystal planes, and many single crystalline nanoplates grown on the IOS architecture, relative to a reference planar film prepared under similar conditions. As a result, the optimized ‘exactly’ three Fe 2 TiO 5 layers IOS electrode with a sacrificial gallium oxide underlayer and a ternary (Ni 2 CoFe)OOH co-catalyst records 2.08 mA cm −2 at 1.23 V RHE under 1 sun (100 mW cm −2 ) irradiation, which is the highest photocurrent density produced by Fe 2 TiO 5 photoanode up to date.
URI
https://scholarworks.unist.ac.kr/handle/201301/27181
URL
https://www.sciencedirect.com/science/article/pii/S2211285519304318?via%3Dihub
DOI
10.1016/j.nanoen.2019.05.025
ISSN
2211-2855
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ECHE_Journal Papers
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