Abstract
The development of ultrasmall transition-metal dichalcogenide (such as MoS2, MoSe2) nanostructures is an efficient strategy to increase the active edge sites and overall performance for hydrogen evolution reaction. Here, we report an in-situ tearing strategy to produce the carbon nanotube supported subnanometer ternary MoSeS (denoted as CNTs@NiSe@MoSeS) for efficient hydrogen evolution. Large (18.3 ± 1.1 nm in length) multilayer MoS2 sheets grown on Ni (OH)2 thin film are torn into subnanometer (5.2 ± 0.7 nm in length) MoSeS via a subsequent selenization progress, along with the transformation of Ni(OH)2 thin film into small NiSe nanoplates. The resulting nanocomposite exhibits abundant active edge sites, outstanding 10,000-cycle stability and ultrahigh activity with a low overpotential of 189 mV at a high current density of 200 mA cm−2 toward hydrogen evolution.
摘要
制备超小型层状金属硫属化合物是一种有效增加边缘活性位点和高效提升析氢性能的方法. 本文首次报道了一种原位撕裂的方法来制备由碳纳米管(CNTs)支撑的三元MoSeS纳米复合析氢催化剂. 生长在CNTs@Ni(OH)2薄膜上的大尺寸多层MoS2片(18.3± 1.1 nm), 通过原位的硒化过程被撕裂成超小的MoSeS(5.2 ± 0.7nm)纳米片, 同时Ni(OH)2薄膜也被转化为小尺寸的NiSe纳米晶, 最终得到的纳米复合催化剂具有丰富的边缘活性位点,表现出超高的活性, 在200 mA cm−2高的电流密度下, 过电势只要189 mV; 同时在10000次循环下, 依旧保持优异的稳定性. 该工作为纳米晶催化剂的设计和应用打下了良好的基础.
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Acknowledgements
This research was supported in part by the National Natural Science Foundation of China (21475007 and 21675009), and the Fundamental Research Funds for the Central Universities (buctrc201608 and buctrc201720). We also thank the support from the “Public Hatching Platform for Recruited Talents of Beijing University of Chemical Technology”.
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Wenli Lu is currently a Master candidate in chemistry under the supervision of Prof. Leyu Wang at Beijing University of Chemical Technology (BUCT) since 2015. His research interest is focused on the fabrication of functional nanostructures for electrocatalysis.
Leyu Wang is a professor of chemistry at BUCT. He received his PhD in chemistry from Tsinghua University with Prof. Yadong Li in 2007. Then he joined Prof. Huang’s group at the University of California at Los Angeles (UCLA) as a postdoctoral researcher from 2007 to 2009. He moved to BUCT’s Chemistry Department in October 2009. His research interests span from the controlled synthesis of upconversion luminescence nanoparticles (UCNPs), localized surface plasmon resonance (LSPR) near-infrared (NIR) semiconductor NPs, magnetic nanomaterials, metal-semiconductor heteronanostructures, and molecularly imprinted polymers (MIPs) nanomaterials to the applications including electro-catalysis, artificial photosynthesis, biochemical sensing, multimodal imaging, drug/gene delivery and photothermo/chemo-therapy.
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Lu, W., Cui, J., Jiang, R. et al. In-situ wet tearing based subnanometer MoSeS for efficient hydrogen evolution. Sci. China Mater. 60, 929–936 (2017). https://doi.org/10.1007/s40843-017-9112-4
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DOI: https://doi.org/10.1007/s40843-017-9112-4