MoS2-graphene-CuNi2S4 nanocomposite an efficient electrocatalyst for the hydrogen evolution reaction
MoS2-graphene-CuNi2S4 nanocomposite an efficient electrocatalyst for the hydrogen evolution reaction
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DOI：
10.1016/j.ijhydene.2019.05.004
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发表时间：
2019-06-21
影响因子：
7.2
通讯作者：
Banks, Craig E.
中科院分区：
文献类型：
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作者：
Adarakatti, Prashanth Shivappa;Mahanthappa, Mallappa;Banks, Craig E.
我们提出了一种简便的方法来合成一种新型的2D-MoS2，石墨烯和CuNi2S4(MoS2-g-CuNi2S4)纳米复合材料，它对氢气的产生具有高效的电催化活性。通过使用过渡金属(铜和镍-2)掺杂剂增加活性边缘中心对H+吸附的亲和力，同时通过将边缘中心锚定在石墨烯骨架上来增加边缘中心的暴露，显著提高了MoS2纳米片的本征析氢反应(HER)活性。详细的XPS分析表明，S的表面曝光率较高，为17.04%，其中48.83%是金属粘结的S(硫化物)。所合成的MoS2-g-CuNi2S4纳米复合材料被固定在丝网印刷电极上，其起始电位和塔菲尔斜率分别为-0.05V(vs.Rhe)和29.3 mV dec(-1)。这些值接近于多晶铂电极(分别接近零电位(vs.RHE)和21.0mVdec(-1))，并高于裸/未修饰固相电极(分别为-0.43V(vs.RHE)和149.1 mVdec(-1))。考虑到新型MoS2-g-CuNi2S4/SPE电化学平台所显示的高效和她的活性，以及这种纳米复合材料相对较低的相关生产成本，它有可能成为电解槽技术中一种经济有效的铂替代品。(C)2019氢能出版有限责任公司。爱思唯尔有限公司出版。保留所有权利。
We present a facile methodology for the synthesis of a novel 2D-MoS2, graphene and CuNi2S4 (MoS2-g-CuNi2S4) nanocomposite that displays highly efficient electrocatalytic activity towards the production of hydrogen. The intrinsic hydrogen evolution reaction (HER) activity of MoS2 nanosheets was significantly enhanced by increasing the affinity of the active edge sites towards H+ adsorption using transition metal (Cu and Ni-2) dopants, whilst also increasing the edge sites exposure by anchoring them to a graphene framework. Detailed XPS analysis reveals a higher percentage of surface exposed S at 17.04%, of which 48.83% is metal bonded S (sulfide). The resultant MoS2-g-CuNi2S4 nanocomposites are immobilized upon screen-printed electrodes (SPEs) and exhibit a HER onset potential and Tafel slope value of - 0.05 V (vs. RHE) and 29.3 mV dec(-1), respectively. These values are close to that of the polycrystalline Pt electrode (near zero potential (vs. RHE) and 21.0 mV dec(-1), respectively) and enhanced over a bare/unmodified SPE (- 0.43 V (vs. RHE) and 149.1 mV dec(-1), respectively). Given the efficient, HER activity displayed by the novel MoS2-g-CuNi2S4/SPE electrochemical platform and the comparatively low associated cost of production for this nanocomposite, it has potential to be a cost-effective alternative to Pt within electrolyser technologies. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.