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

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• 作者：Antonio Politano ; Mattia Cattelan ; Danil W. Boukhvalov ; Davide Campi ; Anna Cupolillo ; Stefano Agnoli ; Nicoleta G. Apostol ; Paolo Lacovig ; Silvano Lizzit ; Daniel Farías ; Gennaro Chiarello ; Gaetano Granozzi ; Rosanna Larciprete
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：April 26, 2016
• 年：2016
• 卷：10
• 期：4
• 页码：4543-4549
• 全文大小：434K
• 年卷期：0
• ISSN：1936-086X

文摘

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.