Decoration of graphene with nickel nanoparticles: study of the interaction with hydrogen

Gaboardi, Mattia; Bliersbach, Andreas; Bertoni, Giovanni; Aramini, Matteo; Vlahopoulou, Gina; Pontiroli, Daniele; Mauron, Philippe; Magnani, Giacomo; Salviati, G.; Züttel, Andreas; Riccò, Mauro

doi:10.1039/c3ta14127f

Cited by 68 publications

(46 citation statements)

References 42 publications

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“…It has been reported that these metal nanoparticles can be uniformly decorated on graphene surface without forming any carbides [32][33][34] . The graphene-metal hybrids have been found to be highly stable in terms of particle size as a function of reaction time, temperature and reaction between graphene and metal nanoparticles (see supporting information).…”

Section: Microstructural Characterizationmentioning

confidence: 99%

Graphene: a self-reducing template for synthesis of graphene–nanoparticles hybrids

et al. 2015

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Integration of graphene with certain metallic nanoparticles, such as Au, Ag, Pt, Pd, Cu, etc., to produce new generation of hybrid materials is a field of intense research now-adays. Graphene, being a single atomic layer thick sheet of hexagonally arranged sp 2 carbon atoms, has prodigious number of free electrons, which can be used to reduce metallic ions to produce the hybrid material consisting of metal nanoparticles on the 2D fabric of graphene.Efforts were made to explore such property of the virgin graphene by careful in-situ study using UV-visible (UV-vis) spectroscopy and transmission electron microscopy (TEM). The results indicate that it is possible to use surface potential of graphene to reduce Au 3+ , Ag + , Pt 2+ , Pd 2+ and Cu 2+ ions to prepare graphene-metal nanoparticle hybrids. The extensive TEM studies substantiate the finding of the formation of graphene decorated with metal nanoparticles.

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Section: Microstructural Characterizationmentioning

confidence: 99%

Graphene: a self-reducing template for synthesis of graphene–nanoparticles hybrids

et al. 2015

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“…1 They allowed estimation of an average size of graphite crystallites in the materials used, 17 which was equal to about 10 nm for both. The BrunauerEmmet-Teller (BET) surface area (Table 1) and the average pore diameter for the N-free material were the following: 873 m 2 g À1 and 9.6 nm, while those for the N-doped material -474 m 2 g À1 and 8.7 nm.…”

Section: Characterization Of Catalyst Supportsmentioning

confidence: 99%

“…The average pore diameters corresponded to the range of mesopores and the carbon materials used could be related to mesoporous catalyst supports. N-free thermally expanded graphite oxide (TEGO) 17 with an average crystallite size of about 12 nm was used for comparison. Its BET surface area was 505 m 2 g À1 .…”

Section: Characterization Of Catalyst Supportsmentioning

confidence: 99%

Copper on carbon materials: stabilization by nitrogen doping

et al. 2017

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The applicability of Cu/C catalysts is limited by sintering of Cu leading to deactivation in catalytic reactions.We show that the problem of sintering could be resolved by N-doping of the carbon support. Cu nanocatalysts with 1 at% of metal were synthesized by Cu acetate decomposition on N-free and Ndoped (5.7 at% N) mesoporous carbon supports as well as on thermally expanded graphite oxide.Catalytic properties of these samples were compared in hydrogen production from formic acid decomposition. The N-doping leads to a strong interaction of the Cu species with the support providing stabilization of Cu in the form of clusters of less than 5 nm in size and single Cu atoms, which were observed in a significant ratio by atomic resolution HAADF/STEM even after testing the catalyst under harsh conditions of the reaction at 600 K. The mean size of the obtained Cu clusters was by a factor of 7 smaller than that of the particles in the N-free catalyst. The N-doped Cu catalyst possessed good stability in the formic acid decomposition at 478 K for at least 7 h on-stream and a significantly higher catalytic activity than the N-free Cu catalysts. The nature of the strongly interacting Cu species was studied by XPS, XRD and other methods as well as by DFT calculations. The presence of single Cu atoms in the N-doped catalysts should be attributed to their strong coordination by pyridinic nitrogen atoms at the edge of the graphene sheets of the support. We believe that the N-doping of the carbon support will allow expanding the use of Cu/C materials for different applications avoiding sintering and deactivation.

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“…The charge transfer between the electronic structures of HPCM and the transition metal d orbital leads to the excellent metal dispersion and strong binding of the metal nanoparticles, which subsequently give rise to the enhanced hydrogen storage capacities. The hydrogen adsorption capacity of Ni-HPCM materials in the present work is higher than those of previously reported Ni-doped carbon powder materials in the literature [32][33][34][35][36][37][38], and the hydrogen adsorption capacities are compared in Table 1.…”

Section: Hydrogen Adsorptionmentioning

confidence: 64%

Hydrothermal synthesis of Ni-doped hierarchically porous carbon monoliths for hydrogen storage

Liu

Lin

et al. 2015

J Porous Mater

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Hierarchically porous carbon monoliths doped with nickel nanoparticles (Ni-HPCM) have been synthesized by hydrothermal method. The obtained Ni-HPCM materials exhibit a three dimensional interconnected macroporous network (0.5-3.5 lm), high specific surface area (620 m 2 /g), large pore volume (0.41 cm 3 /g), and narrow pore size distribution (3.9 nm). The Ni-HPCM materials present a high hydrogen storage capacity. At the pressure of 5 bar, the Ni-HPCM materials show a maximum hydrogen capacity of 4.29 and 1.69 wt% at 77 and 298 K, respectively. The enhanced hydrogen storage capacity is due to the hydrogen spillover effect, which allows the dissociation of hydrogen molecules on the surface of nickel nanoparticles and consequent adsorption of hydrogen atoms inside the channels of HPCM material. Therefore, the Ni-doped hierarchically porous carbon monoliths in the present study are potentially suitable to be used in the range of hydrogen storage.

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Decoration of graphene with nickel nanoparticles: study of the interaction with hydrogen

Cited by 68 publications

References 42 publications

Graphene: a self-reducing template for synthesis of graphene–nanoparticles hybrids

Graphene: a self-reducing template for synthesis of graphene–nanoparticles hybrids

Copper on carbon materials: stabilization by nitrogen doping

Hydrothermal synthesis of Ni-doped hierarchically porous carbon monoliths for hydrogen storage

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