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Water-induced hydrogenation of graphene/metal interfaces at room temperature: Insights on water intercalation and identification of sites for water splitting.
- Source :
- Nano Research; Dec2019, Vol. 12 Issue 12, p3101-3108, 8p
- Publication Year :
- 2019
-
Abstract
- Though it is well recognized that the space between graphene cover and the metal substrate can act as a two-dimensional (2D) nanoreactor, several issues are still unresolved, including the role of the metal substrate, the mechanisms ruling water intercalation and the identification of sites at which water is decomposed. Here, we solve these issues by means of density functional theory and high-resolution electron energy loss spectroscopy experiments carried out on graphene grown on (111)-oriented Cu foils. Specifically, we observe decomposition of H<subscript>2</subscript>O at room temperature with only H atoms forming bonds with graphene and with buried OH groups underneath the graphene cover. Our theoretical model discloses physicochemical mechanisms ruling the migration and decomposition of water on graphene/Cu. We discover that the edge of graphene can be easily saturated by H through decomposition of H<subscript>2</subscript>O, which allows H<subscript>2</subscript>O to migrate in the subsurface region from the decoupled edge, where H<subscript>2</subscript>O decomposes at room temperature. Hydrogen atoms produced by the decomposition of H<subscript>2</subscript>O initially form a chemical bond with graphene for the lower energy barrier compared with other routes. These findings are essential to exploit graphene/Cu interfaces in catalysis and in energy-related applications. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19980124
- Volume :
- 12
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- Nano Research
- Publication Type :
- Academic Journal
- Accession number :
- 140205502
- Full Text :
- https://doi.org/10.1007/s12274-019-2561-y