Identification of active edge sites for electrochemical H2 evolution from MoS2 nanocatalysts
Identification of active edge sites for electrochemical H2 evolution from MoS2 nanocatalysts
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DOI：
10.1126/science.1141483
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发表时间：
2007-07-06
期刊：
影响因子：
56.9
通讯作者：
Chorkendorff, Ib
中科院分区：
文献类型：
--
作者：
Jaramillo, Thomas F.;Jorgensen, Kristina P.;Chorkendorff, Ib
多相催化活性中心的鉴定需要表面敏感方法和反应性研究相结合。我们确定了析氢的活性位点，贵金属催化的反应，在纳米颗粒二硫化钼（MoS2）上，通过原子解析该催化剂的表面，然后测量溶液中的电化学活性。通过制备不同尺寸的MoS2纳米颗粒，我们系统地改变了Au（111）上MoS2纳米颗粒的表面位点分布，我们用扫描隧道显微镜对其进行了定量。析氢的电催化活性测量与MoS2催化剂上的边缘位点的数量线性相关。
The identification of the active sites in heterogeneous catalysis requires a combination of surface sensitive methods and reactivity studies. We determined the active site for hydrogen evolution, a reaction catalyzed by precious metals, on nanoparticulate molybdenum disulfide (MoS2) by atomically resolving the surface of this catalyst before measuring electrochemical activity in solution. By preparing MoS2 nanoparticles of different sizes, we systematically varied the distribution of surface sites on MoS2 nanoparticles on Au(111), which we quantified with scanning tunneling microscopy. Electrocatalytic activity measurements for hydrogen evolution correlate linearly with the number of edge sites on the MoS2 catalyst.