CO2 Electroreduction on Well-Defined Bimetallic Surfaces: Cu Overlayers on Pt(111) and Pt(211)

Ana Sofia Varela Gasque, Christian Georg Schlaup, Zarko P. Jovanov, Paolo Malacrida, Sebastian Horch, Ifan E. L. Stephens, Ib Chorkendorff

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Abstract

We have studied the electrochemical reduction of CO2 on Cu overlayers on Pt(111) and Pt(211) surfaces. These systems were chosen to investigate the effect of strain on the catalytic activity of Cu surfaces and to obtain information about the role of steps in this process. The selectivity toward hydrocarbons on the copper overlayers is much lower than on polycrystalline copper due to a higher selectivity for hydrogen evolution. With the aim of understanding the lower activity toward CO2 electroreduction of the Cu overlayers, we also studied the surfaces under reaction condition using electrochemical scanning tunneling microscopy (EC-STM). In the presence of CO, the Cu overlayer changes from a flat to a granular structure exposing part of the Pt surface. The exposed Pt surface accounts for the high selectivity of these structures toward hydrogen evolution. These results illustrate the dynamic nature of the surface under reaction conditions and that in situ measurements are crucial to understand catalytic activity.

Original languageEnglish
JournalThe Journal of Physical Chemistry Part C
Volume117
Issue number40
Pages (from-to)2020500-20508
ISSN1932-7447
DOIs
Publication statusPublished - 2013

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