Journal of Physical Chemistry C
Journal of Physical Chemistry C
5 years ago

Insight on Thermally Activated Hydrocarbon Dehydrogenation on the Pt3Ni(111) Surface: From Adsorbed Hydrocarbons up to Graphene Formation

Insight on Thermally Activated Hydrocarbon Dehydrogenation on the Pt3Ni(111) Surface: From Adsorbed Hydrocarbons up to Graphene Formation
Gennaro Chiarello, Lin Wang, Antonio Politano
The Pt3Ni(111) alloy is characterized by the presence of an outermost surface layer only composed by Pt atoms, that is, the so-called Pt skin, which is at the basis of its outstanding performances in oxygen reduction reaction. The growth of graphene on this alloy is further motivated by the realization of a charge-neutral Gr/metal gate, which can be replaced by a p-doped Gr/oxide/metal configuration upon heating in an oxygen environment. Herein, we have followed the complete reaction pathway starting with adsorbed hydrocarbons and ending with the large-scale growth of a graphene overlayer. Experiments using temperature-programmed X-ray photoelectron spectroscopy have been carried out for different conditions (C2H4 dose and sample temperature). Submonolayer graphene (0.08 ML) is reached upon heating at T = 1000 K an ethene monolayer dosed at T = 80 K. Conversely, monolayer graphene domains are achieved for C2H4 cracking at T = 800 K. We also find that carbon atoms dissolved into the bulk segregate toward the substrate during the cooling.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b11102

DOI: 10.1021/acs.jpcc.7b11102

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