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 MoS_x > 2. Due to its hybrid structure, the MoS_x > 2/Mo nanomaterial can be effectively used for electro- and photocatalysis of water splitting. The MoS_{x > 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.

中文翻译：

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Mo纳米粒子沉积辅助脉冲激光烧蚀形成氢析出MoS x> 2的有效电催化剂

摘要

研究了MoS ₂靶材在脉冲激光烧蚀过程中的成膜机理。确定了沉积激光腐蚀羽流的条件。这使得可以获得具有多孔结构的涂层的涂层，该多孔结构由涂覆有非晶态硫化钼MoS _{x  > 2的}薄壳的圆形Mo纳米颗粒组成。由于其混合结构，MoS _{x  > 2} / Mo纳米材料可以有效地用于水分解的电催化和光催化。MoS _{x > 2}沉积在玻璃碳基底上的/ Mo膜的特点是电流传输性能好和有效表面积大。当膜厚度由于沉积时间的增加而增加时，在酸溶液中析氢的过电压单调降低至142.5 mV，这对于获得10 mA / cm ²的析氢电流密度是必需的。催化剂负载量为230μg/ cm ²。负载的进一步增加并未显着降低过电压。结果表明，有望将Mo纳米颗粒用作非晶态硫化钼催化纳米层的超细载体。