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首页> 外文期刊>RSC Advances >Enhanced optical, magnetic and hydrogen evolution reaction properties of Mo1?xNixS2 nanoflakes
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Enhanced optical, magnetic and hydrogen evolution reaction properties of Mo1?xNixS2 nanoflakes

机译：Mo1？xNixS2纳米片的增强的光，磁和氢析出反应特性

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Due to exceptional electronic, optoelectronic and catalytic properties, MoS _(2) has attracted extensive research interest in various applications. In the present scenario, the exploitation of noble-metal-free catalysts for hydrogen evolution is of great interest. Herein, we report the structural, optical, magnetic and electrocatalytic properties of pure and nickel-substituted MoS _(2) nanostructures synthesized by the hydrothermal method. X-ray diffraction (XRD) analysis reveals that all samples exhibit the hexagonal structure of MoS _(2) and the formation of NiS _(2) at higher concentrations of nickel. Vibrating sample magnetometer (VSM) measurements of the Mo _(1? x ) Ni _( x ) S _(2) nanostructures show a hysteresis loop at room temperature with a higher saturation magnetization for 1% Ni-substituted MoS _(2) nanostructures, confirming the ferromagnetic behaviour of the sample. The indirect-to-direct band gap transition of few-layered nanostructures was confirmed by the optical absorption spectrum showing bands in the 600–700 nm and 350–450 nm regions. This study also highlights the excitation wavelength-dependent down- and up-conversion photoluminescence of the as-synthesized samples, providing new horizons for the design of MoS _(2) -based optical and spintronic devices. The electrocatalytic effect of 3% Ni-substituted MoS _(2) nanostructures has been found to be higher than that of other deposit concentrations as it corresponds to the efficient hydrogen evolution reaction (HER).
机译：由于优异的电子，光电和催化性能，MoS _（2）在各种应用中引起了广泛的研究兴趣。在目前的情况下，开发无氢气的无贵金属催化剂引起了人们的极大兴趣。在这里，我们报告通过水热法合成的纯和镍取代的MoS _（2）纳米结构的结构，光学，磁性和电催化性能。 X射线衍射（XRD）分析表明，所有样品在较高的镍浓度下均呈现MoS _（2）的六方结构和NiS _（2）的形成。 Mo _（1？x）Ni _（x）S _（2）纳米结构的振动样品磁强计（VSM）测量显示，在室温下磁滞回线对于1％Ni取代的MoS _（2）具有较高的饱和磁化强度。纳米结构，证实了样品的铁磁行为。几层纳米结构的间接到直接带隙跃迁通过光学吸收光谱得到证实，该光谱显示了600-700 nm和350-450 nm区域的能带。这项研究还强调了合成样品的激发波长依赖的下转换和上转换光致发光，为基于MoS _（2）的光学和自旋电子器件的设计提供了新的视野。已发现3％Ni取代的MoS _（2）纳米结构的电催化作用高于其他沉积物浓度，因为它对应于有效的析氢反应（HER）。

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