Feng Yangyang, Zhang Ting, Zhang Jiahui, Fan Hao, He Cheng, Song Jiangxuan
State Key Laboratory for Mechanical Behavior of Materials, Shaanxi International Research Center for Soft Matter, Xi'an Jiaotong University, Xi'an, 710049, China.
Small. 2020 Aug;16(33):e2002850. doi: 10.1002/smll.202002850. Epub 2020 Jul 19.
Metallic phase (1T) MoS has been regarded as an appealing material for hydrogen evolution reaction. In this work, a novel interface-induced strategy is reported to achieve stable and high-percentage 1T MoS through highly active 1T-MoS /CoS hetero-nanostructure. Herein, a large number of heterointerfaces can be obtained by interlinked 1T-MoS and CoS nanosheets in situ grown from the molybdate cobalt oxide nanorod under moderate conditions. Owing to the strong interaction between MoS and CoS , high-percentage of metallic-phase (1T) MoS of 76.6% can be achieved, leading to high electroconductivity and abundant active sites compared to 2H MoS . Furthermore, the interlinked MoS and CoS nanosheets can effectively disperse the nanosheets so as to enlarge the exposed active surface area. The near zero free energy of hydrogen adsorption at the heterointerface can also be achieved, indicating the fast kinetics and excellent catalytic activity induced by heterojunction. Therefore, when applied in hydrogen evolution reaction (HER), 1T-MoS /CoS heterostructure delivers low overpotential of 71 and 26 mV at the current density of 10 mA cm with low Tafel slops of 60 and 43 mV dec , respectively in alkaline and acidic conditions.
金属相（1T）的二硫化钼（MoS）被认为是一种用于析氢反应的有吸引力的材料。在这项工作中，报道了一种新颖的界面诱导策略，通过高活性的1T-MoS /CoS异质纳米结构来实现稳定且高比例的1T MoS。在此，在温和条件下，由钼酸钴氧化物纳米棒原位生长的相互连接的1T-MoS和CoS纳米片可获得大量异质界面。由于MoS和CoS之间的强相互作用，可实现76.6%的高比例金属相（1T）MoS，与2H MoS相比，导致高电导率和丰富的活性位点。此外，相互连接的MoS和CoS纳米片可有效分散纳米片，从而扩大暴露的活性表面积。在异质界面处还可实现接近零的氢吸附自由能，表明异质结诱导的快速动力学和优异的催化活性。因此，当应用于析氢反应（HER）时，1T-MoS /CoS异质结构在碱性和酸性条件下，在电流密度为10 mA cm时分别具有71和26 mV的低过电位，Tafel斜率分别为60和43 mV dec。
