Pfaff Sebastian, Larsson Alfred, Orlov Dmytro, Harlow Gary S, Abbondanza Giuseppe, Linpé Weronica, Rämisch Lisa, Gericke Sabrina M, Zetterberg Johan, Lundgren Edvin
Combustion Physics, Lund University, Sölvegatan 14, S-22363 Lund, Sweden.
Division of Synchrotron Radiation Research, Lund University, Sölvegatan 14, S-22363 Lund, Sweden.
ACS Appl Mater Interfaces. 2021 Apr 28;13(16):19530-19540. doi: 10.1021/acsami.1c04961. Epub 2021 Apr 19.
We have developed a microscope with a spatial resolution of 5 μm, which can be used to image the two-dimensional surface optical reflectance (2D-SOR) of polycrystalline samples in conditions. Within the field of surface science, tools that give information about the surface structure or chemistry of a sample under realistic experimental conditions have proven to be very valuable to understand the intrinsic reaction mechanisms in thermal catalysis, electrocatalysis, and corrosion science. To study heterogeneous surfaces , the experimental technique must both have spatial resolution and be able to probe through gas or electrolyte. Traditional electron-based surface science techniques are difficult to use under high gas pressure conditions or in an electrolyte due to the short mean free path of electrons. Since it uses visible light, SOR can easily be used under high gas pressure conditions and in the presence of an electrolyte. In this work, we use SOR in combination with a light microscope to gain information about the surface under realistic experimental conditions. We demonstrate this by studying the different grains of three polycrystalline samples: Pd during CO oxidation, Au in electrocatalysis, and duplex stainless steel in corrosion. Optical light-based techniques such as SOR could prove to be a good alternative or addition to more complicated techniques in improving our understanding of complex polycrystalline surfaces with measurements.
我们已经开发出一种空间分辨率为5μm的显微镜，它可用于在特定条件下对多晶样品的二维表面光学反射率（2D-SOR）进行成像。在表面科学领域，能够在实际实验条件下提供有关样品表面结构或化学信息的工具，已被证明对于理解热催化、电催化和腐蚀科学中的内在反应机制非常有价值。为了研究异质表面，实验技术必须既具有空间分辨率，又能够穿透气体或电解质进行探测。传统的基于电子的表面科学技术由于电子平均自由程短，在高气压条件下或电解质中难以使用。由于SOR使用可见光，因此它可以很容易地在高气压条件下以及存在电解质的情况下使用。在这项工作中，我们将SOR与光学显微镜结合使用，以在实际实验条件下获取有关表面的信息。我们通过研究三种多晶样品的不同晶粒来证明这一点：CO氧化过程中的Pd、电催化中的Au以及腐蚀过程中的双相不锈钢。诸如SOR之类的基于光学光的技术可能被证明是一种很好的替代方法，或者是对更复杂技术的补充，有助于通过测量更好地理解复杂的多晶表面。
