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PVP Functionalized Marigold-like MoS 2 as a New Electrocatalyst for Highly Efficient Electrochemical Hydrogen Evolution
Electrocatalysis ( IF 2.7 ) Pub Date : 2020-03-21 , DOI: 10.1007/s12678-020-00594-y
Weili Wang , Bingqing Qiu , Chenxi Li , Xiaqiang Shen , Jing Tang , Yi Li , Guokun Liu

Molybdenum disulfide is regarded as the inheritor of Pt-based catalysts for the hydrogen evolution reaction (HER), arising from low-cost and abundant resource. However, the electrocatalytic efficiency of MoS2 is much lower than that of Pt-based catalysts, as a result of lacking edge active sites, poor activity of basal plane, and deficient conductivity. Herein, by introducing nanoflower-like MoS2 with PVP coating (PVP@MoS2) as catalyst, high performance for HER is observed. The higher efficiency of PVP@MoS2 is mainly due to the four points: (1) the formation of more spatial manipulated nanoflower structure by thin MoS2 slices exposing large amount of edge active sites; (2) improving basal plane atom utilization with the enlarged (002) plane from 6.2 to 6.8 Å; (3) the intrinsic conductivity of MoS2 increases, because the electron can transfer from C=O and C–N to MoS2; (4) the decreased hydrogen atom absorption energy from 0.815 to 0.684 eV extracts from DFT calculation. Therefore, the synergetic effect of the micro/nano-structure and electronic structure offers a simple, effective, and possible way for many other 2D materials to enhance their electrocatalytic HER activity.

Graphical Abstract



中文翻译:

PVP功能化的类似万寿菊的MoS 2作为高效电化学放氢的新型电催化剂

二硫化钼被认为是低成本和丰富资源产生的Pt基催化剂,用于氢释放反应(HER)。但是,由于缺少边缘活性位,基面活性差和电导率不足,MoS 2的电催化效率远低于Pt基催化剂。在此,通过引入具有PVP涂层(PVP @ MoS 2)作为催化剂的纳米花状MoS 2,观察到HER的高性能。PVP @ MoS 2的较高效率主要归因于以下四个方面:(1)通过薄MoS 2形成更多空间可操纵的纳米花结构暴露大量边缘活性部位的切片;(2)通过扩大(002)平面从6.2到6.8Å来提高基面原子的利用率;(3)MoS 2的固有电导率增加,因为电子可以从C = O和C–N转移到MoS 2;(4)从DFT计算中提取的氢原子吸收能从0.815 eV降低到0.684 eV。因此,微/纳米结构与电子结构的协同效应为许多其他2D材料增强其电催化HER活性提供了一种简单,有效且可能的方式。

图形概要

更新日期:2020-04-21
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