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A high-efficiency electrocatalyst for hydrogen evolution based on tree-like amorphous MoS2 nanostructures prepared by glancing angle deposition
Journal of Solid State Chemistry ( IF 3.3 ) Pub Date : 2020-02-21 , DOI: 10.1016/j.jssc.2020.121255
Tian Zhang , Jianwen Huang , Yudong Xia , Ruipeng Zhao , Bai Sun , Jie Xiong , Bowan Tao , Hongyan Wang , Yong Zhao

Metal sulfides are commonly used in energy storage and electrocatalysis due to their redox centers and active sites. Here, nanostructured amorphous MoS2 with highly efficient electrocatalytic performance was designed and prepared for hydrogen production using glancing angle deposition (GLAD) magnetron sputtering (MS). A special tree-like MoS2 was obtained under a glancing angle of 5° as demonstrated by the X-ray diffraction (XRD) analysis. This tree-like nanostructure MoS2 exhibited excellent HER activity with a low over potential of 280 mV at 10 mA cm−2 and a small Tafel slope of 63 mV dec−1. Further, X-ray photoelectron spectroscopy (XPS) investigations revealed the different chemical states of sulfur element. The enhancement of HER performance is attributed to the unsaturated sulfur edges and the increased surface contact area. The results obtained from this study are expected to facilitate the large scale fabrication of sulfide catalysts for HER.



中文翻译:

基于掠射角沉积制备的树状非晶态MoS 2纳米结构的高效析氢电催化剂

金属硫化物由于其氧化还原中心和活性部位而通常用于能量存储和电催化。在此,设计并制备了具有高效电催化性能的纳米结构非晶MoS 2,并使用掠角沉积(GLAD)磁控溅射(MS)进行了制氢。如X射线衍射(XRD)分析所示,在5°的掠射角下获得了特殊的树状MoS 2。这种树状的纳米结构MoS 2表现出出色的HER活性,在10 mA cm -2时的过电位为280 mV,Tafel斜率小,为dec -1的63 mV。。此外,X射线光电子能谱(XPS)研究揭示了硫元素的不同化学状态。HER性能的提高归因于不饱和硫边缘和增加的表面接触面积。预期从该研究中获得的结果将有助于大规模制备用于HER的硫化物催化剂。

更新日期:2020-02-21
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