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Unveiling the Mechanisms Leading to H-2 Production Promoted by Water Decomposition on Epitaxial Graphene at Room Temperature

Title
Unveiling the Mechanisms Leading to H-2 Production Promoted by Water Decomposition on Epitaxial Graphene at Room Temperature
Author
Bukhvalov, Danil
Keywords
graphene; water; hydrogen storage; hydrogen production
Issue Date
2016-06
Publisher
AMER CHEMICAL SOC
Citation
ACS NANO, v. 10, NO 4, Page. 4543-4549
Abstract
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.
URI
https://pubs.acs.org/doi/10.1021/acsnano.6b00554https://repository.hanyang.ac.kr/handle/20.500.11754/73309
ISSN
1936-0851; 1936-086X
DOI
10.1021/acsnano.6b00554
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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