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Enhanced Photoelectrochemical Performance of Cuprous Oxide/Graphene Nanohybrids
University of Szeged, Hungary.ORCID iD: 0000-0003-3237-9222
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2017 (English)In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 139, no 19, p. 6682-6692Article in journal (Refereed) Published
Abstract [en]

Combination of an oxide semiconductor with a highly conductive nanocarbon framework (such as graphene or carbon nanotubes) is an attractive avenue to assemble efficient photo electrodes for solar fuel generation. To fully-exploit the possible synergies of the hybrid formation, however, precise knowledge of these systems is required to allow rational design and morphological engineering. In this paper, we present the controlled electrochemical deposition of nanocrystalline p-Cu2O on the surface of different graphene substrates. The developed synthetic protocol allowed tuning of the-morphological features of the hybrids as, deduced from electron microscopy. (Photo)electrochemical measurements (including photovoltammetry, electrochemical impedance spectroscopy, photocurrent transient analysis) demonstrated better performance for the 2D graphene containing photoelectrodes, compared to the bare Cu2O films, the enhanced performance being rooted in suppressed charge carrier recombination. To elucidate the precise role of graphene, comparative studies were performed with carbon nanotube (CNT) films and 3D graphene foams. These studies revealed, after allowing for the effect of increased surface area, that the 3D graphene substrate outperformed the other two nanocarbons. Its interconnected structure facilitated effective charge separation and transport, leading to better harvesting of the generated photoelectrons. These hybrid assemblies are shown to be potentially attractive candidates in photoelectrochemical energy conversion schemes, namely CO2 reduction.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2017. Vol. 139, no 19, p. 6682-6692
Keywords [en]
Graphene-Based Photocatalysts, Copper-Oxide Films, Carbon-Dioxide, Water Oxidation, Co2 Reduction, Solar-Energy, Nanowire Arrays, Conversion, Charge, Composites
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-218744DOI: 10.1021/jacs.7b01820ISI: 000401781900031PubMedID: 28460518Scopus ID: 2-s2.0-85019645604OAI: oai:DiVA.org:kth-218744DiVA, id: diva2:1161488
Funder
EU, Horizon 2020, 716539
Note

QC 20171130

Available from: 2017-11-30 Created: 2017-11-30 Last updated: 2017-11-30Bibliographically approved

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CiteExportLink to record
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