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Electronically Coupled Uranium and Iron Oxide Heterojunctions as Efficient Water Oxidation Catalysts

Tutkimustuotosvertaisarvioitu

Standard

Electronically Coupled Uranium and Iron Oxide Heterojunctions as Efficient Water Oxidation Catalysts. / Leduc, Jennifer; Gönüllü, Yakup; Ruoko, Tero-Petri; Fischer, Thomas; Mayrhofer, Leonhard; Tkachenko, Nikolai V.; Dong, Chung-Li; Held, Alexander; Moseler, Michael; Mathur, Sanjay.

julkaisussa: Advanced Functional Materials, 03.10.2019.

Tutkimustuotosvertaisarvioitu

Harvard

Leduc, J, Gönüllü, Y, Ruoko, T-P, Fischer, T, Mayrhofer, L, Tkachenko, NV, Dong, C-L, Held, A, Moseler, M & Mathur, S 2019, 'Electronically Coupled Uranium and Iron Oxide Heterojunctions as Efficient Water Oxidation Catalysts', Advanced Functional Materials. https://doi.org/10.1002/adfm.201905005

APA

Leduc, J., Gönüllü, Y., Ruoko, T-P., Fischer, T., Mayrhofer, L., Tkachenko, N. V., ... Mathur, S. (2019). Electronically Coupled Uranium and Iron Oxide Heterojunctions as Efficient Water Oxidation Catalysts. Advanced Functional Materials, [1905005]. https://doi.org/10.1002/adfm.201905005

Vancouver

Leduc J, Gönüllü Y, Ruoko T-P, Fischer T, Mayrhofer L, Tkachenko NV et al. Electronically Coupled Uranium and Iron Oxide Heterojunctions as Efficient Water Oxidation Catalysts. Advanced Functional Materials. 2019 loka 3. 1905005. https://doi.org/10.1002/adfm.201905005

Author

Leduc, Jennifer ; Gönüllü, Yakup ; Ruoko, Tero-Petri ; Fischer, Thomas ; Mayrhofer, Leonhard ; Tkachenko, Nikolai V. ; Dong, Chung-Li ; Held, Alexander ; Moseler, Michael ; Mathur, Sanjay. / Electronically Coupled Uranium and Iron Oxide Heterojunctions as Efficient Water Oxidation Catalysts. Julkaisussa: Advanced Functional Materials. 2019.

Bibtex - Lataa

@article{9c2c1dcb50a944bc894d35f088c94632,
title = "Electronically Coupled Uranium and Iron Oxide Heterojunctions as Efficient Water Oxidation Catalysts",
abstract = "The most critical challenge faced in realizing a high efficiency photoelectrochemical water splitting process is the lack of suitable photoanodes enabling the transfer of four electrons involved in the complex oxygen evolution reaction (OER). Uranium oxides are efficient catalysts due to their wide range optical absorption (E-g approximate to 1.8-3.2 eV), high photoconductivity, and multiple valence switching among uranium centers that improves the charge propagation kinetics. Herein, thin films of depleted uranium oxide (U3O8) are demonstrated grown via chemical vapor deposition effectively accelerate the OER in conjunction with hematite (alpha-Fe2O3) overlayers through a built-in potential at the interface. Density functional theory simulations demonstrate that the multivalence of U and Fe ions induce the adjustment of the band alignment subject to the concentration of interfacial Fe ions. In general, the equilibrium state depicts a type II band edge as the favored alignment, which improves charge-transfer processes as observed in transient and X-ray absorption (TAS and XAS) spectroscopy. The enhanced water splitting photocurrent density of the heterostructures (J = 2.42 mA cm(-2)) demonstrates the unexplored potential of uranium oxide in artificial photosynthesis.",
keywords = "absorption spectroscopy, DFT simulations, heterojunction, OER, photoelectrochemical water splitting, ULTRATHIN HEMATITE FILMS, LAYER-BY-LAYER, THIN-FILM, TRANSITION-METAL, OXYGEN, STATES, EVOLUTION, SPECTROSCOPY, PERFORMANCE, UNDERLAYER",
author = "Jennifer Leduc and Yakup G{\"o}n{\"u}ll{\"u} and Tero-Petri Ruoko and Thomas Fischer and Leonhard Mayrhofer and Tkachenko, {Nikolai V.} and Chung-Li Dong and Alexander Held and Michael Moseler and Sanjay Mathur",
year = "2019",
month = "10",
day = "3",
doi = "10.1002/adfm.201905005",
language = "English",
journal = "Advanced Functional Materials",
issn = "1616-301X",
publisher = "WILEY-V C H VERLAG GMBH",

}

RIS (suitable for import to EndNote) - Lataa

TY - JOUR

T1 - Electronically Coupled Uranium and Iron Oxide Heterojunctions as Efficient Water Oxidation Catalysts

AU - Leduc, Jennifer

AU - Gönüllü, Yakup

AU - Ruoko, Tero-Petri

AU - Fischer, Thomas

AU - Mayrhofer, Leonhard

AU - Tkachenko, Nikolai V.

AU - Dong, Chung-Li

AU - Held, Alexander

AU - Moseler, Michael

AU - Mathur, Sanjay

PY - 2019/10/3

Y1 - 2019/10/3

N2 - The most critical challenge faced in realizing a high efficiency photoelectrochemical water splitting process is the lack of suitable photoanodes enabling the transfer of four electrons involved in the complex oxygen evolution reaction (OER). Uranium oxides are efficient catalysts due to their wide range optical absorption (E-g approximate to 1.8-3.2 eV), high photoconductivity, and multiple valence switching among uranium centers that improves the charge propagation kinetics. Herein, thin films of depleted uranium oxide (U3O8) are demonstrated grown via chemical vapor deposition effectively accelerate the OER in conjunction with hematite (alpha-Fe2O3) overlayers through a built-in potential at the interface. Density functional theory simulations demonstrate that the multivalence of U and Fe ions induce the adjustment of the band alignment subject to the concentration of interfacial Fe ions. In general, the equilibrium state depicts a type II band edge as the favored alignment, which improves charge-transfer processes as observed in transient and X-ray absorption (TAS and XAS) spectroscopy. The enhanced water splitting photocurrent density of the heterostructures (J = 2.42 mA cm(-2)) demonstrates the unexplored potential of uranium oxide in artificial photosynthesis.

AB - The most critical challenge faced in realizing a high efficiency photoelectrochemical water splitting process is the lack of suitable photoanodes enabling the transfer of four electrons involved in the complex oxygen evolution reaction (OER). Uranium oxides are efficient catalysts due to their wide range optical absorption (E-g approximate to 1.8-3.2 eV), high photoconductivity, and multiple valence switching among uranium centers that improves the charge propagation kinetics. Herein, thin films of depleted uranium oxide (U3O8) are demonstrated grown via chemical vapor deposition effectively accelerate the OER in conjunction with hematite (alpha-Fe2O3) overlayers through a built-in potential at the interface. Density functional theory simulations demonstrate that the multivalence of U and Fe ions induce the adjustment of the band alignment subject to the concentration of interfacial Fe ions. In general, the equilibrium state depicts a type II band edge as the favored alignment, which improves charge-transfer processes as observed in transient and X-ray absorption (TAS and XAS) spectroscopy. The enhanced water splitting photocurrent density of the heterostructures (J = 2.42 mA cm(-2)) demonstrates the unexplored potential of uranium oxide in artificial photosynthesis.

KW - absorption spectroscopy

KW - DFT simulations

KW - heterojunction

KW - OER

KW - photoelectrochemical water splitting

KW - ULTRATHIN HEMATITE FILMS

KW - LAYER-BY-LAYER

KW - THIN-FILM

KW - TRANSITION-METAL

KW - OXYGEN

KW - STATES

KW - EVOLUTION

KW - SPECTROSCOPY

KW - PERFORMANCE

KW - UNDERLAYER

U2 - 10.1002/adfm.201905005

DO - 10.1002/adfm.201905005

M3 - Article

JO - Advanced Functional Materials

JF - Advanced Functional Materials

SN - 1616-301X

M1 - 1905005

ER -