Formation of Effective Electrocatalysts of Hydrogen Evolution MoS x > 2 by Pulsed Laser Ablation Assisted by the Depo
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ICAL PHYSICS OF NANOMATERIALS
Formation of Effective Electrocatalysts of Hydrogen Evolution MoSx > 2 by Pulsed Laser Ablation Assisted by the Deposition of Mo Nanoparticles D. V. Fominskia, V. N. Nevolina, V. Yu. Fominskia, *, R. I. Romanova, O. V. Komlevaa, P. F. Kartseva, and G. V. Golubkovb aNational b
Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, 115409 Russia Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow, 119991 Russia *e-mail: [email protected] Received May 20, 2019; revised September 9, 2019; accepted September 20, 2019
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. Keywords: molybdenum sulfides, thin films, nanostructure, electrocatalysis, hydrogen evolution, pulsed laser deposition DOI: 10.1134/S1990793120040041
INTRODUCTION Transition metal chalcogenides, in particular, molybdenum sulfides MoSx with fairly high sulfur contents (x ≥ 2) have a unique ability to activate the electrochemical reaction of hydrogen evolution in acid and alkaline solutions. This causes growing interest in the development of new hybrid and nanocomposite materials containing such nanocomponents [1–3] and in studies of the reaction mechanisms of hydrogen evolution on chalcogen-containing nanophases with an amorphous or crystalline structure [4, 5]. As is known, the use of several nanostructured components in one functional coating enhances their useful properties, and even qualitatively new characteristics can be obtained [6, 7]. The majority of publications showed that catalytically active materials based on MoSx are created by chemical synthesis using expensive and often environmentally hazardous precursors. To obtain a continuous coating of nanoparticle catalysts, sometimes binders (ion-exchange resins) are used, which can reduce the efficiency of nanoparticles and impair the chemical resistance of the catalytic layer. Physical vapor deposition of catalytic layers such as pul
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