Pt-Ru合金薄膜的电沉积制备及其电化学表面增强红外吸收光谱

在1mmol·L-1H2PtCl6+1mmol·L-1RuCl3+0.1mol·L-1H2SO4镀液中采用电沉积法在化学镀金膜的红外窗口Si反射面上制备Pt50Ru50合金电极.利用原子力显微镜(AFM)可以观察到制备的Pt50Ru50合金电极形貌呈现出100-200nm大小的颗粒.常规电化学分析方法得出该电极具有典型的合金特征,对CO和CH3OH具有很好的催化氧化作用.应用电化学现场衰减全反射表面增强红外光谱法(ATR-SEIRAS)可以观察到该电极上Pt位和Ru位上CO的振动谱峰,且表现出Pt-Ru二元金属良好的协同催化性能.

Electrodeposition Preparation of a Pt-Ru Alloy Film and Its Electrochemical Surface-Enhanced IR Absorption Spectroscopy

An electrodeposition approach was developed for the formation of Pt50Ru50 alloy electrodes on a Au-coated Si prismas the infrared window in 1 mmol·L-1 H2PtCl6+1 mmol·L-1 RuCl3+0.1 mol·L-1 H2SO4 solution. The as-prepared Pt50Ru50 alloy electrodes consisted of 100-200 nm nanostructured particles, as determined by atomic force microscope (AFM) image. The significant alloy character of the film and its catalytic activity for CO and CH3OH electrooxidation were demonstrated by conventional electrochemical methods. CO molecules adsorbed on both the Pt and Ru sites of the Pt50Ru50 alloy electrodes could be easily identified using in situ attenuation total reflection (ATR) surface-enhanced infrared (IR) absorption spectroscopy (ATR-SEIRAS). ATR-SEIRAS also revealed that Pt50Ru50 alloy electrodes underwent a bimetallic synergetic effect in catalytic oxidation to CO and CH3OH.