Comparative Study of the Structure, Composition, and Electrocatalytic Performance of Hydrogen Evolution in MoSx~2+δ/Mo and MoSx~3+δ Films Obtained by Pulsed Laser Deposition

Fominski, V.; Demin, M.; Fominski, D.; Romanov, R.; Goikhman, A.; Maksimova, K.

doi:10.3390/nano10020201

Open AccessArticle

Comparative Study of the Structure, Composition, and Electrocatalytic Performance of Hydrogen Evolution in MoS_x_~2+δ/Mo and MoS_x~_3+δ Films Obtained by Pulsed Laser Deposition

by

V. Fominski

^1,*

,

M. Demin

²,

D. Fominski

¹,

R. Romanov

¹,

A. Goikhman

² and

K. Maksimova

²

¹

Moscow Engineering Physics Institute, National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 115409 Moscow, Russia

²

Russia Immanuel Kant Baltic Federal University, 236016 Kaliningrad, Russia

^*

Author to whom correspondence should be addressed.

Nanomaterials 2020, 10(2), 201; https://doi.org/10.3390/nano10020201

Submission received: 2 December 2019 / Revised: 21 January 2020 / Accepted: 22 January 2020 / Published: 24 January 2020

(This article belongs to the Special Issue Laser Synthesis of Nanomaterials)

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Abstract

Systematic and in-depth studies of the structure, composition, and efficiency of hydrogen evolution reactions (HERs) in MoS_x films, obtained by means of on- and off-axis pulsed laser deposition (PLD) from a MoS₂ target, have been performed. The use of on-axis PLD (a standard configuration of PLD) in a buffer of Ar gas, with an optimal pressure, has allowed for the formation of porous hybrid films that consist of Mo particles which support a thin MoS_x_~2+δ (δ of ~0.7) film. The HER performance of MoS_x_~2+δ/Mo films increases with increased loading and reaches the highest value at a loading of ~240 μg/cm². For off-axis PLD, the substrate was located along the axis of expansion of the laser plume and the film was formed via the deposition of the atomic component of the plume, which was scattered in Ar molecules. This made it possible to obtain homogeneous MoS_x_~3+δ (δ~0.8–1.1) films. The HER performances of these films reached saturation at a loading value of ~163 μg/cm². The MoS_x_~3+δ films possessed higher catalytic activities in terms of the turnover frequency of their HERs. However, to achieve the current density of 10 mA/cm², the lowest over voltages were −162 mV and −150 mV for the films obtained by off- and on-axis PLD, respectively. Measurements of electrochemical characteristics indicated that the differences in the achievable HER performances of these films could be caused by their unique morphological properties.

Keywords: pulsed laser deposition; nanocatalysts; buffer gas; transition metal chalcogenides; hydrogen evolution reaction

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MDPI and ACS Style

Fominski, V.; Demin, M.; Fominski, D.; Romanov, R.; Goikhman, A.; Maksimova, K. Comparative Study of the Structure, Composition, and Electrocatalytic Performance of Hydrogen Evolution in MoS_x_~2+δ/Mo and MoS_x~_3+δ Films Obtained by Pulsed Laser Deposition. Nanomaterials 2020, 10, 201. https://doi.org/10.3390/nano10020201

AMA Style

Fominski V, Demin M, Fominski D, Romanov R, Goikhman A, Maksimova K. Comparative Study of the Structure, Composition, and Electrocatalytic Performance of Hydrogen Evolution in MoS_x_~2+δ/Mo and MoS_x~_3+δ Films Obtained by Pulsed Laser Deposition. Nanomaterials. 2020; 10(2):201. https://doi.org/10.3390/nano10020201

Chicago/Turabian Style

Fominski, V., M. Demin, D. Fominski, R. Romanov, A. Goikhman, and K. Maksimova. 2020. "Comparative Study of the Structure, Composition, and Electrocatalytic Performance of Hydrogen Evolution in MoS_x_~2+δ/Mo and MoS_x~_3+δ Films Obtained by Pulsed Laser Deposition" Nanomaterials 10, no. 2: 201. https://doi.org/10.3390/nano10020201

APA Style

Fominski, V., Demin, M., Fominski, D., Romanov, R., Goikhman, A., & Maksimova, K. (2020). Comparative Study of the Structure, Composition, and Electrocatalytic Performance of Hydrogen Evolution in MoS_x_~2+δ/Mo and MoS_x~_3+δ Films Obtained by Pulsed Laser Deposition. Nanomaterials, 10(2), 201. https://doi.org/10.3390/nano10020201

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Comparative Study of the Structure, Composition, and Electrocatalytic Performance of Hydrogen Evolution in MoS_x_~2+δ/Mo and MoS_x~_3+δ Films Obtained by Pulsed Laser Deposition

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