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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Electrochemical Surface Oxidation of Copper Studied by in Situ Grazing Incidence X-ray Diffraction
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Electrochemical Surface Oxidation of Copper Studied by in Situ Grazing Incidence X-ray Diffraction

机译：通过原位放牧发病率X射线衍射研究的电化学表面氧化

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摘要

Grazing incidence X-ray diffractometry (GIXRD) can deliver integral information on the structure and chemistry of surface near regions, which can be beneficial for functional materials related to interfacial reactions. Here, we present an in situ laboratory GIXRD setup for electrochemical experiments. The method is capable of directly correlating changes of the crystalline surface structure to the electrochemical conditions. It combines cyclovoltametric (CV) and chronoamperometric (CA) curves of crystalline samples, which can be recorded over the entire pH range, with simultaneous GIXRD measurements. The stepwise oxidation of polycrystalline copper in alkaline medium acts as an example to prove the functionality of the setup. In situ GIXRD measurements during CA experiments reveal a stepwise oxidation mechanism of metallic Cu to Cu2+ involving crystalline cuprite (Cu2O) intermediates. The results highlight the importance of conducting in situ experiments under controlled environments comparable simple oxidation reaction in order to track transient states even for a comparable simple oxidation reaction.
机译：放牧发病X射线衍射测量（GixRD）可以提供有关地区表面结构和化学结构的整体信息，这对于与界面反应有关的功能材料有益。在这里，我们提出了一个用于电化学实验的原位实验室GixRD设置。该方法能够直接将晶体表面结构的变化与电化学条件直接相关。它结合了晶体样品的环伏污物（CV）和计数曲线（CA）曲线，其可以在整个pH范围内记录，同时具有GixRD测量。碱性介质中的多晶铜的逐步氧化作用为示例以证明设置的功能。在CA实验期间，原位GixRD测量显示金属Cu的逐步氧化机制至Cu2 +涉及结晶铜矿（Cu2O）中间体。结果突出了在受控环境下进行原位实验的重要性，其具有可比的简单氧化反应，以跟踪瞬态状态，即使对于可比的简单氧化反应。

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