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Desorption Kinetics of Carbon Dioxide from a Graphene-Covered Pt(111) Surface

机译:石墨烯覆盖Pt(111)表面的二氧化碳解吸动力学

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The interaction of carbon dioxide (CO2) with a graphene-covered Pt(111) surface was investigated using temperature-programmed desorption (TPD) and reflection absorption infrared spectroscopy (RAIRS). The TPD spectra show monolayer and multilayer desorption peaks; however, the multilayer peak is not well-separated from the monolayer peak. The TPD spectra for submonolayer and multilayer coverages align on separate common leading edges. This alignment is a signature of zero-order desorption kinetics. The RAIRS spectra for submonolayer coverages have a relatively sharp peak at, similar to 2350 cm(-1), which is assigned to the v(3) asymmetric stretch. The peak is observed at the onset of CO2, adsorption, and the area of the peak increases linearly with coverage. This suggests that CO2, does not lie flat on the surface but instead has a component of its bond axis perpendicular to the graphene surface.
机译:使用温度编程的解吸(TPD)和反射吸收红外光谱(距离)研究二氧化碳(CO2)与石墨烯覆盖的Pt(111)表面的相互作用。 TPD光谱显示单层和多层解吸峰; 然而,多层峰与单层峰分离得很好。 用于子组和多层覆盖范围的TPD光谱对齐在单独的常见前缘上。 此对齐是零阶解散动力学的签名。 用于块覆盖范围的坡度谱具有相对尖锐的峰值,类似于2350cm(-1),其被分配给V(3)不对称伸展。 在CO 2的发作,吸附和峰的面积以覆盖范围线性增加,观察到峰值。 这表明CO2不平坦地在表面上平坦,而是具有垂直于石墨烯表面的键合轴的组分。

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