Local Surface Structure and Composition Control the Hydrogen Evolution Reaction on Iron Nickel Sulfides
Local Surface Structure and Composition Control the Hydrogen Evolution Reaction on Iron Nickel Sulfides
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DOI：
10.1002/anie.201712679
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发表时间：
2018-04-03
影响因子：
16.6
通讯作者：
Schuhmann, Wolfgang
中科院分区：
文献类型：
--
作者：
Bentley, Cameron L.;Andronescu, Corina;Schuhmann, Wolfgang
为了设计更强大的电催化剂，发展我们对广泛丰富的大块材料的表面结构和组成的作用的理解是至关重要的。在寻找替代析氢反应（HER）催化剂以取代铂的过程中尤其如此。我们报道了扫描电化学电池显微镜（SECCM）对Fe4.5Ni4.5S8(111)-晶体平面的测量，这是一种高活性的HER催化剂。结合结构表征方法，我们表明这种技术可以揭示由最轻微的成分变化引起的活性差异。通过在纳米尺度上探测电化学性质，结合互补的结构信息，揭示了新的设计原则，用于合理的材料合成。
In order to design more powerful electrocatalysts, developing our understanding of the role of the surface structure and composition of widely abundant bulk materials is crucial. This is particularly true in the search for alternative hydrogen evolution reaction (HER) catalysts to replace platinum. We report scanning electrochemical cell microscopy (SECCM) measurements of the (111)-crystal planes of Fe4.5Ni4.5S8, a highly active HER catalyst. In combination with structural characterization methods, we show that this technique can reveal differences in activity arising from even the slightest compositional changes. By probing electrochemical properties at the nanoscale, in conjunction with complementary structural information, novel design principles are revealed for application to rational material synthesis.