Atomic Layer Deposition of MoSe2 Nanosheets on TiO2 Nanotube Arrays for Photocatalytic Dye Degradation and Electrocatalytic Hydrogen Evolution

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Authors

ZAZPE Raul KRUMPOLEC Richard SOPHA Hanna RODRIGUEZ-PEREIRA Jhonatan CHARVOT Jaroslav HROMÁDKO Luděk KOLÍBALOVÁ Eva MICHALIČKA Jan PAVLIŇÁK David MOTOLA Martin PŘIKRYL Jan KRBAL Miloš BUREŠ Filip MACAK Jan M.

Year of publication 2020
Type Article in Periodical
Magazine / Source ACS Applied Nano Materials
MU Faculty or unit

Faculty of Science

Citation
Web https://doi.org/10.1021/acsanm.0c02553
Doi http://dx.doi.org/10.1021/acsanm.0c02553
Keywords MoSe2; nanosheets; atomic layer deposition; TiO2 nanotube layers; catalysis
Description Herein, a hierarchical MoSe2/1D TiO2 nanotube layer structure was successfully fabricated in a simple and fast fashion and its photocatalytic and electrocatalytic properties were assessed. The novelty of this work lies in the utilization of the atomic layer deposition (ALD) technique to deposit MoSe2 nanosheets on 1D TiO2 nanotube layers. The photoelectrochemical and photo- and electrocatalytic properties were explored and optimized as a function of MoSe2 ALD cycles. ALD allowed precise control on MoSe2 nanosheet size, and in turn, on the surface structure, which is pivotal for efficient catalysts. The MoSe2 nanosheets grew on both the inner and outer 1D TiO2 nanotube surface mainly in a perpendicular orientation, maximizing the exposed active edges, an essential aspect to fully exploit the MoSe2 photo- and electrochemical properties. Outstanding photo- and electrocatalytic activities were recorded in both organic dye pollutant degradation and hydrogen evolution reaction applications, respectively. The excellent photocatalytic and electrochemical activities stem from the synergy between tailored ALD loading of MoSe2 nanosheets and the 1D TiO2 nanotubular structure with a high surface/volume ratio, which provides fast electron transfer and easy access to the MoSe2 active edges, boosting the catalytic activity.
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