Promoted Catalytic Activity of a Platinum Monolayer Cluster on Graphite

Kondo, Takahiro; Izumi, Ken-ichi; Watahiki, Kenji; Iwasaki, Yasuki; Suzuki, T.; Nakamura, Junji

doi:10.1021/jp8069833

Cited by 31 publications

(39 citation statements)

References 32 publications

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“…Second, the chemical effect due to the modification of the Pt electronic structure, by the GNS support, may cause a difference in the catalytic activities. In the previous surface science study, we have found in the case of a Pt-deposited graphite sample, that significant chemical interactions at the interface between the graphite surface and the Pt catalyst particles leads to modifications in the electronic structure of the Pt catalysts [13]. It has also been reported that graphene sheets strongly interact with Ru (0001) surfaces by π -d hybridization.…”

Section: Resultsmentioning

confidence: 92%

Sub-nano-Pt cluster supported on graphene nanosheets for CO tolerant catalysts in polymer electrolyte fuel cells

Yoo

Okada

Akita

et al. 2011

Journal of Power Sources

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112

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The carbon monoxide (CO) tolerance performance of polymer electrode fuel cells (PEFCs) was studied for a catalyst composed of graphene nanosheets (GNS) with sub-nano Pt clusters. The Pt catalysts supported on the GNS showed a higher CO tolerance performance in the hydrogen oxidation reaction (HOR), which was significantly different from that of platinum on carbon black (Pt/CB). It is proposed that the presence of the sub-nano Pt clusters promotes the catalytic activity and that the substrate carbon material alters the catalytic properties of Pt via the interface interactions between the graphene and the Pt. We have discovered that GNS gives rise to extraordinary modification to the metal clusters particles of electrocatalyst support. In this letter, we report on the electrocatalytic activity of sub-nano Pt particles supported on GNS (graphene nanosheets) for the CO tolerance of polymer electrode fuel cell (PEFC).Study of the CO tolerance for anode catalysts using Pt/GNS revealed an unusually high catalytic activity compared to the Pt/VulcanXC-72R. The enhanced electrocatalytic activity is ascribed to the specific electronic structure of Pt particles below 0.5 nm in size supported on GNS. Important point is that the electronic structure or the catalytic activity of Pt can be significantly modified by the interface interaction with carbon, probably -d hybridization. The Pt/GNS also revealed higher durability than that of Pt/carbon black after 3000 repeated potential cycles (about 21 h). This suggests that GNS are a superior substrate material on which to anchor Pt particles for use in fuel cells.Since our report on the electrode properties shall play an important role in the future study on the relevant metal particles and GNS (graphene nanosheets), we believe that our article is worth reporting in The Journal of Power Sources. AbstractThe carbon monoxide (CO) tolerance performance of polymer electrode fuel cells (PEFCs) was studied for a catalyst composed of graphene nanosheets (GNS) with sub-nano Pt clusters. The Pt catalysts supported on the GNS showed a higher CO tolerance performance in the hydrogen oxidation reaction (HOR), which was significantly different from that of platinum on carbon black (Pt/CB). It is proposed that the presence of the sub-nano Pt clusters promotes the catalytic activity and that the substrate carbon material alters the catalytic properties of Pt via the interface interactions between the graphene and the Pt.

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Section: Resultsmentioning

confidence: 92%

Sub-nano-Pt cluster supported on graphene nanosheets for CO tolerant catalysts in polymer electrolyte fuel cells

Yoo

Okada

Akita

et al. 2011

Journal of Power Sources

Self Cite

112

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“…The height-width distribution is similar to Pt nanoclusters which have been reported previously. 7 The atomic scale STM images are shown in Figs. 1͑c͒ and 1͑d͒.…”

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confidence: 99%

Formation of nonbondingπelectronic states of graphite due to Pt-C hybridization

et al. 2009

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The electronic states of the graphite surface with platinum clusters have been investigated at the atomic scale by scanning tunneling spectroscopy. The distinct local density of states were observed near the Fermi level for carbon atoms around the Pt clusters, which has been ascribed as nonbonding electronic states of graphite due to Pt-C hybridization. This is consistent with the experimentally observed weaker phonon energies of graphite near the Pt cluster as well as the results of first-principles density-functional calculations of a graphene sheet with a Pt cluster.

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“…It is considered that the high CO tolerance performance of the thin CNTs (15 nm) is ascribed to the flat surface structure of CNTs consisting of graphene sheet, which is suggested by the good graphitization of surface carbon as shown by the Raman spectra (Fig.1). In the surface science study, we have also found in the model study using a Pt-deposited graphite sample that significant chemical interaction at the interface between the graphite surface and the Pt catalyst particles leads to modification in the electronic structure of Pt catalysts [5]. Furthermore, we have discovered that GNS (graphene nanosheet) gives rise to extraordinary modification to the metal clusters particles of electrocatalysts support [9].…”

Section: Resultsmentioning

confidence: 91%

Effect of Nanocarbon Substrate Materials on the CO Tolerance of PtRu Electrocatalysts for Fuel Cell

Yoo¹,

Takáno²,

Nakamura³

2009

ECS Trans.

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The support effect of carbon nanotubes (CNTs) on the performance of CO tolerant electrocatalysts for polymer electrode fuel cell (PEFC) was studied by preparing identical Pt-Ru catalyst particles in a liquid phase and then attaching them on CNTs with different diameter (15-100 nm) and specific surface area. The PtRu catalysts supported on a thinner multi-walled CNT with the diameter of 15 nm shows higher CO tolerance performance in the hydrogen oxidation reaction (HOR). It is thus considered that the CO tolerance of Pt-Ru electrocatalyst is significantly dependent on the kind of CNTs surface.

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Promoted Catalytic Activity of a Platinum Monolayer Cluster on Graphite

Cited by 31 publications

References 32 publications

Sub-nano-Pt cluster supported on graphene nanosheets for CO tolerant catalysts in polymer electrolyte fuel cells

Sub-nano-Pt cluster supported on graphene nanosheets for CO tolerant catalysts in polymer electrolyte fuel cells

Formation of nonbondingπelectronic states of graphite due to Pt-C hybridization

Effect of Nanocarbon Substrate Materials on the CO Tolerance of PtRu Electrocatalysts for Fuel Cell

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