MoSexOy-Coated 1D TiO2 Nanotube Layers: Efficient Interface for Light-Driven Applications

Ng SW, Krbal M, Zazpe R, Prikryl J, Charvot J, Dvorak F, Strizik L, Slang S, Sopha H, Kosto Y, Matolin V, Yam FK, Bures F, Macak JM (2018)

Publication Type: Journal article

Publication year: 2018

Journal

Advanced Materials Interfaces WILEY-VCH Verlag GmbH & Co. KGaA

Book Volume: 5

Article Number: 1701146

Journal Issue: 3

DOI: 10.1002/admi.201701146

Abstract

Ultrathin molybdenum oxyselenide (MoSexOy) coatings are made first ever by atomic layer deposition (ALD) within anodic 1D TiO2 nanotube layers for photoelectrochemical and photocatalytic applications. The coating thickness is controlled through varying ALD cycles from 5 to 50 cycles (corresponding to ≈1–10 nm). In the ultraviolet region, the coatings have enhanced up to four times the incident photon-to-current conversion efficiency (IPCE), and the highest IPCE is recorded at 32% at (at λ = 365 nm). The coatings notably extend the photoresponse to the visible spectral region and remarkable improvement of photocurrent densities up to ≈40 times is registered at λ = 470 nm. As a result, the MoSexOy-coated-TiO2 nanotube layers have shown to be an effective photocatalyst for methylene blue degradation, and the optimal performance is credited to a coating thickness between 2 and 5 nm (feasible only by ALD). The enhancement in photoactivities of the presented heterojunction is mainly associated with the passivation effect of MoSexOy on the TiO2 nanotube walls and the suitability of bandgap position between MoSexOy and TiO2 interface for an efficient charge transfer. In addition, MoSexOy possesses a narrow bandgap, which favors the photoactivity in the visible spectral region.

Authors with CRIS profile

Siow Woon Ng

Involved external institutions

University of Pardubice CZ Czech Republic (CZ) Univerzita Karlova v Praze / Charles University in Prague CZ Czech Republic (CZ) University of Science Malaysia (USM) / Universiti Sains Malaysia MY Malaysia (MY)

How to cite

APA:

Ng, S.W., Krbal, M., Zazpe, R., Prikryl, J., Charvot, J., Dvorak, F.,... Macak, J.M. (2018). MoSexOy-Coated 1D TiO2 Nanotube Layers: Efficient Interface for Light-Driven Applications. Advanced Materials Interfaces, 5(3). https://doi.org/10.1002/admi.201701146

MLA:

Ng, Siow Woon, et al. "MoSexOy-Coated 1D TiO2 Nanotube Layers: Efficient Interface for Light-Driven Applications." Advanced Materials Interfaces 5.3 (2018).

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