Edge- oriented MoS2 supported on nickel/ carbon core- shell nanospheres for enhanced hydrogen evolution reaction performance
Edge- oriented MoS2 supported on nickel/ carbon core- shell nanospheres for enhanced hydrogen evolution reaction performance
复制标题
镍/碳核壳纳米球上负载的边缘导向MoS2可增强析氢反应性能
DOI：
10.1039/c9nj00612e
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发表时间：
2019
影响因子：
3.3
通讯作者：
Dong Mingdong
中科院分区：
文献类型：
--
作者：
Wang Yin;Wang Zegao;Yang Qian;Hua An;Ma Song;Zhang Zhidong;Dong Mingdong
二硫化钼（MoS 2）作为一种重要的二维过渡金属二硫属化合物（TMDs），具有巨大的催化应用潜力。然而，导电性差和活性边缘位点不足是限制二硫化钼作为高效电催化剂的主要障碍。在本研究中，在镍/碳（Ni/C）核壳球表面合成了大量的边缘取向的2D-MoS 2纳米片。边缘取向的MoS 2纳米片不仅增加了活性边缘的暴露数量，而且促进了活性边缘与Ni/C球之间的电荷转移。电化学结果表明，镍/碳/MoS 2（Ni/C/MoS 2）纳米球具有最高的活性，在10 mA cm−2的电流密度下，Tafel斜率小至55.5 mV/decade，过电位小至275 mV。此外，这种Ni/C/MoS 2核-壳结构通过2000个循环的循环伏安法和随后的9000 s i-t曲线测试证明了良好的稳定性和耐久性。该方法提供了进一步改善MoS 2的电化学催化以产生用于能量存储的氢的机会。
Molybdenum disulfide (MoS2), as one of the important two-dimensional (2D) transition metal dichalcogenides (TMDs), has shown huge potential for catalytic applications. However, both poor conductivity and insufficient active edge sites are the main obstacles limiting MoS2 as a highly efficient electrocatalyst. In this study, a great number of edge-oriented 2D-MoS2 nanosheets were synthesized on the surface of nickel/carbon (Ni/C) core–shell spheres. The edge-oriented MoS2 nanosheets not only increase the number of exposed active edges, but also promote the charge transfer between active edges and Ni/C spheres. The electrochemical results show that nickel/carbon/MoS2 (Ni/C/MoS2) nanospheres deliver the highest activity with a Tafel slope as small as 55.5 mV per decade and an overpotential as small as 275 mV at a current density of 10 mA cm−2. Furthermore, this Ni/C/MoS2 core–shell architecture shows good stability and durability by the proof of 2000 cycles of cyclic voltammetry followed by a 9000 s i–t curve test. The method provides an opportunity to further improve the electrochemical catalysis of MoS2 to produce hydrogen for energy storage.