Персона:
Фоминский, Дмитрий Вячеславович

Организационные подразделения

Организационная единица

Институт лазерных и плазменных технологий

Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.

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Фоминский

Имя

Дмитрий Вячеславович

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Только метаданные
Pulsed laser deposition of nanostructured MoS3/np-Mo//WO3-y hybrid catalyst for enhanced (Photo) electrochemical hydrogen evolution
(2019) Gnedovets, A.; Novikov, S.; Fominskii, V.; Fominski, D.; Romanov, R.; Kartsev, P.; Rubinkovskaya, O.; Фоминский, Вячеслав Юрьевич; Фоминский, Дмитрий Вячеславович; Романов, Роман Иванович; Карцев, Петр Федорович; Рубинковская, Оксана Владимировна
© 2019 by the authors. Licensee MDPI, Basel, Switzerland.Pulsed laser ablation of MoS2 and WO3 targets at appropriate pressures of background gas (Ar, air) were used for the preparation of new hybrid nanostructured catalytic films for hydrogen production in an acid solution. The films consisted of a nanostructured WO3-y underlayer that was covered with composite MoS3/np-Mo nanocatalyst. The use of dry air with pressures of 40 and 80 Pa allowed the formation of porous WO3-y films with cauliflower- and web-like morphology, respectively. The ablation of the MoS2 target in Ar gas at a pressure of 16 Pa resulted in the formation of amorphousMoS3films and spherical Mo nanoparticles. The hybrid MoS3/np-Mo//WO3-y films deposited on transparent conducting substrates possessed the enhanced (photo)electrocatalytic performance in comparison with that of any pristine one (MoS3/np-Mo or WO3-y films) with the same loading. Modeling by the kinetic Monte Carlo method indicated that the change in morphology of the deposited WO3-y films could be caused by the transition of ballistic deposition to diffusion limited aggregation of structural units (atoms/clusters) under background gas pressure growth. The factors and mechanisms contributing to the enhancement of the electrocatalytic activity of hybrid nanostructured films and facilitating the effective photo-activation of hydrogen evolution in these films are considered.
Только метаданные
Influence of the Chemical Composition and Local Atomic Packing of Nanostructured MoSx and MoSex Solid Lubricant Coatings on Their Tribological Properties under Complicated Conditions
(2020) Fominski, V. Y.; Nevolin, V. N.; Fominski, D. V.; Romanov, R. I.; Gritskevich, M. D.; Фоминский, Вячеслав Юрьевич; Неволин, Владимир Николаевич; Фоминский, Дмитрий Вячеславович; Романов, Роман Иванович; Грицкевич, Мария Дмитриевна
© 2020, Pleiades Publishing, Ltd.Abstract: We present the results of a comparative investigation of the friction and wear characteristics of MoSx and MoSex coatings in an oxidizing medium (argon–air mixture) at a temperature of –100°C. Thin films of these solid lubricants were manufactured by pulsed laser deposition using MoS2, MoSe2, and Mo targets in vacuum and H2S. It was established that S-containing coatings ensured a friction coefficient of ~0.09 and were much superior to S-containing coatings in respect of wear. The properties of MoSx coatings depended on the concentration of S that determined the local atomic packing in the amorphous structure of the film. The friction coefficient of MoS3 coating after running-in was half as small as that of MoS2 and amounted to 0.08.
Только метаданные
Features of Sliding Friction on Thin-Film Mo–S–C Coatings Prepared by Pulsed Laser Deposition
(2020) Novikov, S. M.; Chesnokov, A. V.; Fominski, V. Y.; Romanov, R. I.; Fominski, D. V.; Фоминский, Вячеслав Юрьевич; Романов, Роман Иванович; Фоминский, Дмитрий Вячеславович
© 2020, Allerton Press, Inc.Abstract: To obtain Mo–S–C thin-film coatings on steel substrates with varying structural and chemical states, pulsed laser codeposition method was used at room temperature, including the first ever use of reactive codeposition of Mo and C in H2S. The conditions are determined for obtaining sufficiently smooth layers with optimal local packing of atoms in amorphous MoSx and diamond-like carbon nanophases, which yielded relatively high wear resistance and a low sliding friction coefficient (~0.1) in air without a long running-in phase.
Только метаданные
Surface Physicochemical Treatment of Nickel Foam for Increasing Its Electrocatalytic Activity in Overall Water Splitting
(2020) Fominski, D. V.; Nevolin, V. N.; Romanov, R. I.; Fominski, V. Y.; Komleva, O. V.; Kartsev, P. F.; Novikov, S. M.; Фоминский, Дмитрий Вячеславович; Неволин, Владимир Николаевич; Романов, Роман Иванович; Фоминский, Вячеслав Юрьевич; Рубинковская, Оксана Владимировна; Карцев, Петр Федорович
© 2020, Pleiades Publishing, Ltd.Abstract: The possibility of using physicochemical methods for treating a nickel foam to increase its electrocatalytic activity in hydrogen and oxygen evolution reactions in an aqueous alkaline solution was studied. The modification of a 1-mm-thick sheet of the foam was carried out through its surface and included physical deposition of pulsed laser plasma for the formation of catalytic MoSx and MoSxSey films, followed by their annealing. The effect of foam pretreatment by sulfurization in H2S under varying conditions and formation of catalytic layers with different structures and compositions was studied. The best improvement in the electrocatalytic performance of the foam was exerted by thin-film coatings of molybdenum sulfide and sulfide/selenide with a nanocrystalline structure formed on the surface of a foam with a Ni3S2 underlayer. The possibility of a synergetic effect of the formed phases was analyzed by DFT calculations. For the optimum composition of the modified layers, the overvoltage of H2 evolution (for a current density of 10 mA/cm2) decreased to 155 mV, and the overvoltage of O2 evolution did not exceed 160 mV. The electrocatalytic characteristics obtained by this treatment are not inferior to those for the best modern electrocatalysts created on nickel foam by widely used methods of hydrothermal synthesis or electrodeposition.
Только метаданные
Electrophysical and Photo-Electrocatalytic Properties of MoS2 Nanofilms
(2020) Fominski, V. Y.; Nevolin, V. N.; Romanov, R. I.; Rubinkovskaya, O. V.; Fominski, D. V.; Soloviev, A. A.; Фоминский, Вячеслав Юрьевич; Неволин, Владимир Николаевич; Романов, Роман Иванович; Рубинковская, Оксана Владимировна; Фоминский, Дмитрий Вячеславович; Соловьев, Алексей
© 2020, Pleiades Publishing, Ltd.Abstract: MoS2 nanofilms were created by thermochemical processing (sulfurization) of thin-film Мо and МоОу precursors in S vapor. The precursor films were created by pulsed laser deposition. The obtained molybdenum disulfide films consisted of 2H-MoS2 nanocrystals with laminar packing of basal planes oriented perpendicular to the film surface. The increase in the sulfurization temperature from 500°C to 800°C provided better quality of local packing and, as a consequence, reduction of electric resistance, higher concentration of carriers (electrons) and their mobility. The application of metal oxide precursor МоОу resulted in higher efficiency of synthesis of high quality MoS2 nanofilms. The efficiency of activation of the electrochemical processes of hydrogen production in an acidic solution was lower with crystalline MoS2 nanofilms than with amorphous MoSx films. Nanocrystalline MoS2 films, however, manifested improved photo- and electrocatalytic characteristics in activation of reactions of hydrogen and oxygen evolution in an alkaline solution.
Только метаданные
Formation of Effective Electrocatalysts of Hydrogen Evolution MoSx > 2 by Pulsed Laser Ablation Assisted by the Deposition of Mo Nanoparticles
(2020) Golubkov, G. V.; Fominski, D. V.; Nevolin, V. N.; Fominski, V. Y.; Romanov, R. I.; Komleva, O. V.; Kartsev, P. F.; Фоминский, Дмитрий Вячеславович; Неволин, Владимир Николаевич; Фоминский, Вячеслав Юрьевич; Романов, Роман Иванович; Рубинковская, Оксана Владимировна; Карцев, Петр Федорович
© 2020, Pleiades Publishing, Ltd.Abstract: The mechanisms of film formation during pulsed laser ablation of a MoS2 target were studied. The conditions for the deposition of laser erosion plume were determined. This made it possible to obtain coatings with a porous structure consisting of round Mo nanoparticles coated with a thin shell of amorphous molybdenum sulfide MoSx > 2. Due to its hybrid structure, the MoSx > 2/Mo nanomaterial can be effectively used for electro- and photocatalysis of water splitting. The MoSx> 2/Mo films deposited on a glassy carbon substrate are characterized by good current transport and high active surface area. When the film thickness increased due to the increased deposition time, the overvoltage of hydrogen evolution in an acid solution monotonically decreased to 142.5 mV, which was necessary in order to obtain current density of hydrogen evolution of 10 mA/cm2. The catalyst loading was 230 μg/cm2. Further increase in the loading did not significantly reduce the overvoltage. The results indicate that it is promising to use Mo nanoparticles as an ultrafine support for the catalytic nanolayers of amorphous molybdenum sulfide.
Только метаданные
The Effect of MoS x Nanocoatings on the Water Electrolysis Performance Using a Nickel-Foam-Based Bifunctional Catalyst
(2019) Novikov, S. M.; Komleva, O. V.; Fominski, D. V.; Romanov, R. I.; Fominski, V. Y.; Esin, M. I.; Рубинковская, Оксана Владимировна; Фоминский, Дмитрий Вячеславович; Романов, Роман Иванович; Фоминский, Вячеслав Юрьевич
© 2019, Pleiades Publishing, Ltd.The ability to increase the efficiency of electrochemical H2 and O2 evolution reactions in an alkaline solution using nickel-foam-based electrodes has been studied. To improve the catalytic properties of the foam, it was subjected to complex modification via sulfurizing in sulfur-containing gaseous media and the additional formation of amorphous or crystalline MoSx nanolayers. The foam was sulfidized in hydrogen sulfide or sulfur vapor at a temperature of 400°C. Amorphous MoSx films were produced via pulsed laser deposition from a MoS2 target in an H2S atmosphere. To obtain nanocrystalline catalytic MoSx layers, thin-film Mo precursors were preliminarily applied to the foam pre-sulfurized in sulfur vapor at 400°C. The deposition of precursors was carried out in vacuum at 22°C. After deposition, the foam with precursors was oxidized in air at 600°C. The modified samples were probed via scanning electron microscopy involving microanalysis and Raman spectroscopy. The effect of the precursor layer thickness on the sulfurizing efficiency and phase composition of the modified layers was established. The amorphous layer deposition was found to have a strong impact on only the O2 evolution. The crystalline layers obtained via sulfidizing of Mo-containing precursors exerted influence on both the cathodic and anodic reactions. The hydrogen overvoltage at a current density of 10 mA/cm2 was −160 mV, and the oxygen overvoltage was below 150 mV, which corresponded to the best electrocatalysts on the nickel foam after the volume modification via conventional chemical treatment (hydro- and solvothermal synthesis).
Только метаданные
Nanostructured MoS3/WSe2 Thin-Film Photocathode for Efficient Water Splitting Under Light Illumination
(2021) Nevolin, V. N.; Romanov, R. I.; Fominski, D. V.; Rubinkovskaya, O. V.; Soloviev, A. A.; Fominski, V. Y.; Неволин, Владимир Николаевич; Романов, Роман Иванович; Фоминский, Дмитрий Вячеславович; Рубинковская, Оксана Владимировна; Соловьев, Алексей; Фоминский, Вячеслав Юрьевич
© 2021, Pleiades Publishing, Ltd.Abstract: The influence of the chemical state of a WOy thin-film precursor on formation of WSe2 nanofilms under rapid selenization on a glassy carbon substrate at 900°C is studied. A nanolayer of amorphous molybdenum sulfide (MoSx ~ 3), which has high catalytic activity in the electrochemical reaction of hydrogen evolution, is applied onto the surface of the obtained WSe2 films by pulsed laser deposition. It is shown that the composition of the WOy thin-film precursor has a significant effect on the morphology of the WSe2 nanolayers, and this characteristic largely determines the efficiency of hydrogen evolution by the MoS3/WSe2 heterostructure upon photoactivated water splitting. The most efficient hydrogen evolution is found for the MoS3/WSe2 photocathode heterostructure containing WSe2 in the form of crystal petals of ~50 nm in thickness, with these crystals oriented perpendicular to the substrate surface. A theoretical analysis of the possible effect of synergistic interaction at the MoS3/WSe2 interface on the efficiency of hydrogen evolution is carried out. Density functional theory calculations have shown that MoS3 clusters can increase the efficiency of the hydrogen evolution reaction upon contact with surface regions of WSe2 nanocrystals different in atomic packing.
Только метаданные
Comparative studies of photoactivated H2 evolution for nano-needle WO3 films with crystalline 2H-WS2 and amorphous a-MoSx co-catalysts
(2021) Romanov, R. I.; Fominski, D. V.; Rubinkovskaya, O. V.; Soloviev, A. A.; Nevolin, V. N.; Fominski, V. Yu.; Романов, Роман Иванович; Фоминский, Дмитрий Вячеславович; Рубинковская, Оксана Владимировна; Соловьев, Алексей; Неволин, Владимир Николаевич; Фоминский, Вячеслав Юрьевич
© 2021 Institute of Physics Publishing. All rights reserved.(Photo)electrocatalytic properties of nanostructured WO3 films used for H2 evolution reaction (HER) were modified by forming hybrid structures containing a crystalline 2H-WS2 and an amorphous a-MoSx phases. For this, respectively, thermochemical treatment of metal oxide films in H2S gas and reaction pulsed laser deposition of molybdenum in H2S were applied. The functional characteristics of the hybrid structures were studied in a three-electrode electrochemical cell in an acid solution under intermittent illumination with a Xe lamp. a-MoSx film deposition caused a more significant improvement in the HER activity of MoSx/WO3 structure compared to that of WS2/WO3 structure. However, WS2/WO3 structures were superior to MoSx/WO3 structures in the efficiency of the photoactivated HER. The factors that could influence the (photo)electrocatalytic behaviour of the created structures were analysed.
Только метаданные
Influence of Sulfidation Conditions of WO3 Nanocrystalline Film on Photoelectrocatalytic Activity of WS2/WO3 Hybrid Structure in Production of Hydrogen
(2021) Shvets, P. V.; Maznitsyna, E. A.; Nevolin, V. N.; Fominski, D. V.; Romanov, R. I.; Rubinkovskaya, O. V.; Soloviev, A. A.; Fominski, V. Y.; Неволин, Владимир Николаевич; Фоминский, Дмитрий Вячеславович; Романов, Роман Иванович; Рубинковская, Оксана Владимировна; Соловьев, Алексей; Фоминский, Вячеслав Юрьевич
© 2021, Pleiades Publishing, Ltd.Abstract: The thermochemical treatment of tungsten trioxide (WO3) nanostructured films in hydrogen sulfide to obtain tungsten disulfide (WS2) layers in the WS2/WO3 hybrid structure is studied. The temperature and treatment time influence the structural-phase state, morphology, optical properties of a WS2/WO3/FTO photocathode (on fluorinated tin oxide (FTO) substrates), and its photoelectrocatalytic activity in the hydrogen evolution reaction in acidic solution is established. The sulfidation of WO3 nanoneedle films leads to the formation of a WS2/WO3 nanocrystalline hybrid structure under optimal conditions, which provides the separation of photogenerated carriers (electrons and holes) at the interphase boundaries (heterojunctions) necessary for the efficient photoactivated hydrogen evolution reaction according to Z scheme. The calculations of thermodynamic properties of the WS2/WO3 hybrid nanocatalyst show that synergistic effect of nanophases is possible in it to increase the catalytic activity of hydrogen evolution both on the basal planes of WS2 nanoclusters and on the surface of metal oxide nanoclusters.