Details

Autor(en) / Beteiligte

• Politano, Antonio
• Cattelan, Mattia
• Boukhvalov, Danil W
• Campi, Davide
• Cupolillo, Anna
• Agnoli, Stefano
• Apostol, Nicoleta G
• Lacovig, Paolo
• Lizzit, Silvano
• Farías, Daniel
• Chiarello, Gennaro
• Granozzi, Gaetano
• Larciprete, Rosanna

Titel

Unveiling the Mechanisms Leading to H2 Production Promoted by Water Decomposition on Epitaxial Graphene at Room Temperature

Ist Teil von

• ACS nano, 2016-04, Vol.10 (4), p.4543-4549

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• By means of a combination of surface-science spectroscopies and theory, we investigate the mechanisms ruling the catalytic role of epitaxial graphene (Gr) grown on transition-metal substrates for the production of hydrogen from water. Water decomposition at the Gr/metal interface at room temperature provides a hydrogenated Gr sheet, which is buckled and decoupled from the metal substrate. We evaluate the performance of Gr/metal interface as a hydrogen storage medium, with a storage density in the Gr sheet comparable with state-of-the-art materials (1.42 wt %). Moreover, thermal programmed reaction experiments show that molecular hydrogen can be released upon heating the water-exposed Gr/metal interface above 400 K. The Gr hydro/dehydrogenation process might be exploited for an effective and eco-friendly device to produce (and store) hydrogen from water, i.e., starting from an almost unlimited source.