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Atomic Layered Titanium Sulfide Quantum Dots as Electrocatalysts for Enhanced Hydrogen Evolution Reaction
Advanced Materials Interfaces ( IF 5.4 ) Pub Date : 2017-10-25 , DOI: 10.1002/admi.201700895
Yang Liu 1, 2 , Chenglu Liang 1, 2 , Jingjie Wu 3 , Tiva Sharifi 2, 4 , Hui Xu 2 , Yusuke Nakanishi 2 , Yingchao Yang 2 , Cristiano F. Woellne 2, 5 , Amir Aliyan 6 , Angel A. Martí 6 , Banghu Xie 1 , Robert Vajtai 2 , Wei Yang 1 , Pulickel M. Ajayan 2
Affiliation  

The overall electrocatalytic activity toward hydrogen evolution reaction for layered transition metal dichalcogenides is governed by their intrinsic activity, the corresponding density of active sites, and the electron transfer resistance. Here, nanoengineering strategies to scale down both the lateral size and thickness of layered 1T‐TiS2 powder to quantum dots (QDs) by bath sonication and probing sonication incision are employed. Uniform lateral size of 3–6 nm in the resulting QDs enhances the density of edge sites while the atomic layer thickness (1–2 nm) facilitates the electron transfer from the substrate to the edge sites. The obtained TiS2 QDs exhibit superior hydrogen evolution reaction activity over TiS2 nanosheets and MoS2 QDs prepared by the same method. The turnover frequency of TiS2 QDs with a small loading of 0.7 ng cm−2 in an optimal deposition on electrode reached ≈2.0 s−1 at an overpotential of −0.2 V versus RHE, several orders of magnitude higher than TiS2 nanosheets (0.01 s−1) and MoS2 QDs (0.07 s−1).

中文翻译:

原子层状硫化钛量子点作为增强氢析出反应的电催化剂

层状过渡金属二卤化物对氢释放反应的总体电催化活性受其内在活性,相应的活性位点密度和电子转移阻力的控制。在这里,采用了纳米工程策略,通过浴超声和探测超声切口将层状1T-TiS 2粉末的横向尺寸和厚度缩小到量子点(QDs)。最终量子点中3–6 nm的均匀横向尺寸增强了边缘部位的密度,而原子层厚度(1-2 nm)则促进了电子从基板到边缘部位的转移。所获得的TiS 2 QDs表现出比TiS 2纳米片和MoS 2优越的析氢反应活性用相同方法制备的量子点。的TiS的周转频率2层的QD具有0.7小装载纳克厘米-2在上电极上的最佳沉积达到≈2.0小号-1处的超电势为-0.2V与RHE的,几个数量级高于的TiS 2个纳米片(0.01 s -1)和MoS 2 QD(0.07 s -1)。
更新日期:2017-10-25
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