Modulation of Surface Chemistry of CO on Ni(111) by Surface Graphene and Carbidic Carbon

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• 作者：Mingming Wei ; Qiang Fu ; Yang Yang ; Wei Wei ; Ethan Crumlin ; Hendrik Bluhm ; Xinhe Bao
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：June 18, 2015
• 年：2015
• 卷：119
• 期：24
• 页码：13590-13597
• 全文大小：547K
• ISSN：1932-7455

文摘

Nickel carbide and graphene overlayers were grown on Ni(111), which were in situ monitored by near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) and low energy electron microscopy. CO adsorption and desorption on the formed carbon-modified Ni(111) surfaces were further investigated by NAP-XPS. We found that the carbidic carbon weakens CO adsorption on Ni, resulting in quick CO desorption around room temperature. A full graphene layer on Ni(111) blocks CO adsorption in 10^鈥? Torr CO, while CO intercalates the graphene overlayers in 0.1 Torr CO at room temperature. On the graphene/CO/Ni(111) surface, the major part of intercalated CO molecules desorbs extensively around 90 掳C from the graphene/Ni interface and the remaining part gets trapped under the graphene even at 200 掳C. These results suggest that the surface reactivity of a metal catalyst can be strongly modulated by surface carbon structures.