Molybdenum sulfide/graphene-carbon nanotube nanocomposite material for electrocatalytic applications in hydrogen evolution reactions
Molybdenum sulfide/graphene-carbon nanotube nanocomposite material for electrocatalytic applications in hydrogen evolution reactions
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硫化钼/石墨烯-碳纳米管纳米复合材料在析氢反应中的电催化应用
DOI：
10.1007/s12274-015-0963-z
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发表时间：
2016-03-01
期刊：
影响因子：
9.9
通讯作者：
Li, Liangbin
中科院分区：
文献类型：
--
作者：
Khan, Majid;Bin Yousaf, Ammar;Li, Liangbin
我们报道了一种由二硫化钼（MoS 2）、还原氧化石墨烯（GO）和碳纳米管（CNT）通过两步工艺制备的三维分层三元杂化复合材料。首先，通过水热处理GO和CNT的水分散体以通过π-π相互作用形成复合结构，合成具有三维微观结构的还原GO-CNT复合材料。然后，MoS 2纳米颗粒在GO-CNT复合材料的表面上水热生长。该三元复合物在析氢反应中表现出优良的上级电催化活性和稳定性，起始电位仅为35 mV，Tafel斜率接近38 mV中心点十进位（-1），表观交换电流密度为74.25 mA中心点cm（-2）。该上级析氢活性源于MoS 2与其电催化活性边缘位点的协同效应以及与底层石墨烯和CNT网络的优异电耦合。
We report a three-dimensional hierarchical ternary hybrid composite of molybdenum disulfide (MoS2), reduced graphene oxide (GO), and carbon nanotubes (CNTs) prepared by a two-step process. Firstly, reduced GO-CNT composites with three-dimensional microstructuresare synthesized by hydrothermal treatment of an aqueous dispersion of GO and CNTs to form a composite structure via pi-pi interactions. Then, MoS2 nanoparticles are hydrothermally grown on the surfaces of the GO-CNT composite. This ternary composite shows superior electrocatalytic activity and stability in the hydrogen evolution reaction, with a low onset potential of only 35 mV, a Tafel slope of similar to 38 mV center dot decade(-1), and an apparent exchange current density of 74.25 mA center dot cm(-2). The superior hydrogen evolution activity stemmed from the synergistic effect of MoS2 with its electrocatalytically active edge-sites and excellent electrical coupling to the underlying graphene and CNT network.