Metallic Twin Boundaries Boost the Hydrogen Evolution Reaction on the Basal Plane of Molybdenum Selenotellurides,Advanced Energy Materials

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Metallic Twin Boundaries Boost the Hydrogen Evolution Reaction on the Basal Plane of Molybdenum Selenotellurides
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-04-14 , DOI: 10.1002/aenm.201800031
Tomasz Kosmala ₁ , Horacio Coy Diaz ₂ , Hannu-Pekka Komsa ₃ , Yujing Ma ₂ , Arkady V. Krasheninnikov _{3,

4} , Matthias Batzill ₂ , Stefano Agnoli ₁

Affiliation

The hydrogen evolution reaction (HER) is a fundamental process that impacts several important clean energy technologies. Great efforts have been taken to identify alternative materials that could replace Pt for this reaction or that may present additional functional properties such as optical activity and advanced electronic properties. Herein, a comparative study of the HER activity for ultrathin films of MoTe₂, MoSe₂, and their solid solutions on highly oriented pyrolytic graphite is reported. Combining advanced characterization techniques and density functional theory calculations with electrochemical measurements, it is shown that the chemical activity of the scarcely reactive 2H phases can be boosted by the presence of metallic twin boundaries. These defects, which are thermodynamically stable and naturally present in Mo‐enriched MoTe₂ and MoSe₂, endow the basal plane of the 2H phase with a high chemical activity, which is comparable to the metastable 1T polymorph.

中文翻译：

金属双边界促进了硒代诺富特素基面上氢的析氢反应

氢气析出反应（HER）是影响几种重要清洁能源技术的基本过程。已经做出了巨大的努力来确定可替代Pt或可呈现其他功能性质（例如光学活性和先进的电子性质）的替代材料。在此，比较研究了MoTe ₂和MoSe ₂超薄膜的HER活性。报道了它们在高度取向的热解石墨上的固溶体。将先进的表征技术和密度泛函理论计算与电化学测量相结合，结果表明，几乎没有反应性的2H相的化学活性可以通过金属双晶界的存在而得到增强。这些缺陷在热力学上是稳定的，并且自然存在于富Mo的MoTe ₂和MoSe _2中，赋予2H相基面很高的化学活性，可与亚稳1T多晶型物相媲美。

更新日期：2018-04-14

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