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Spectroelectrochemical flow cell with temperature control for investigation of electrocatalytic systems with surface-enhanced Raman spectroscopy

机译:带温度控制的光谱电化学流动池,用于表面增强拉曼光谱研究电催化系统

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摘要

We describe a method for investigating the reaction mechanism of fuel cell systems by designing a spectroelectrochemical cell with functions of temperature and flow control to mimic the reaction condition of fuel cell systems and utilizing Au core Pt shell (Au@Pt) nanoparticles to enhance the Raman signal of the surface species on the surface of electrocatalysts. The cell consists of three parts: a thin-layer spectroelectrochemical reaction chamber with an optical window for Raman measurement, the heating chamber right beneath the reaction chamber, and a long spiral flow channel to preheat the solution to the desired temperature and effectively exchange the solution. The temperature of the solution can be easily controlled from room temperature to 80 degrees C, and the flow rate can be as high as 945 mu l s(-1). The temperature and flow control is demonstrated by monitoring the changes in the cyclic voltammograms and the Raman signals. By synthesizing Au@Pt nanoparticles and assembling them on a Pt substrate, we can significantly enhance the Raman signal of surface species on the Pt shell surface, which allows us to detect strong signal of CO as the dissociative product of formic acid as well as the intermediate species of the oxidation process. The further development and perspectives of using SERS to study the electrocatalytic systems are discussed.
机译:我们描述了一种通过设计具有温度和流量控制功能的光谱电化学电池来模拟燃料电池系统的反应条件并利用Au核Pt壳(Au @ Pt)纳米粒子增强拉曼光谱来研究燃料电池系统的反应机理的方法。电催化剂表面上的表面物质的信号。电解池由三部分组成:带有用于拉曼测量的光学窗口的薄层光谱电化学反应室,位于反应室正下方的加热室以及用于将溶液预热至所需温度并有效交换溶液的长螺旋流道。溶液的温度可以很容易地从室温控制到80摄氏度,流速可以高达945μls(-1)。通过监视循环伏安图和拉曼信号的变化来演示温度和流量控制。通过合成Au @ Pt纳米颗粒并将其组装在Pt基板上,我们可以显着增强Pt壳表面上的表面物种的拉曼信号,这使我们能够检测到作为甲酸解离产物的CO的强信号。中间物种的氧化过程。讨论了使用SERS研究电催化体系的进一步发展和前景。

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