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首页> 外文期刊>Chemistry: A European journal >Ionic-liquid-mediated active-site control of MoS _2 for the electrocatalytic hydrogen evolution reaction
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Ionic-liquid-mediated active-site control of MoS _2 for the electrocatalytic hydrogen evolution reaction

机译：离子液体介导的MoS _2电催化氢释放反应的活性位点控制

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摘要

The layered crystal MoS _2 has been proposed as an alternative to noble metals as the electrocatalyst for the hydrogen evolution reaction (HER). However, the activity of this catalyst is limited by the number of available edge sites. It was previously shown that, by using an imidazolium ionic liquid as synthesis medium, nanometre-size crystal layers of MoS _2 can be prepared which exhibit a very high number of active edge sites as well as a de-layered morphology, both of which contribute to HER electrocatalytic activity. Herein, it is examined how to control these features synthetically by using a range of ionic liquids as synthesis media. Non-coordinating ILs with a planar heterocyclic cation produced MoS _2 with the de-layered morphology, which was subsequently shown to be highly advantageous for HER electrocatalytic activity. The results furthermore suggest that the crystallinity, and in turn the catalytic activity, of the MoS _2 layers can be improved by employing an IL with specific solvation properties. These results provide the basis for a synthetic strategy for increasing the HER electrocatalytic activity of MoS _2 by tuning its crystal properties, and thus improving its potential for use in hydrogen production technologies.
机译：已经提出层状晶体MoS _2作为贵金属的替代物，作为氢析出反应（HER）的电催化剂。但是，该催化剂的活性受到可用边缘位点数目的限制。先前显示，通过使用咪唑鎓离子液体作为合成介质，可以制备MoS _2的纳米级晶体层，该晶体层显示出非常高的活性边缘位点以及分层的形态，这两者都有助于对HER的电催化活性。在本文中，研究了如何通过使用一系列离子液体作为合成介质来合成地控制这些特征。具有平面杂环阳离子的非配位IL产生具有分层形态的MoS _2，随后证明对HER电催化活性非常有利。结果还表明，通过使用具有特定溶剂化性质的IL，可以提高MoS _2层的结晶度，进而提高其催化活性。这些结果为通过调整MoS _2的晶体性质从而提高MoS _2的HER电催化活性，从而提高其在制氢技术中的应用潜力提供了合成策略的基础。

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