Metal nanoparticle templating and electrocatalytic modification using functionalized graphene sheets

Ponce, Audaldo A.; Sims, Christopher M.; Liu, Z.; Gaskell, Karen J.; Lai, Linfei; Chiou, Wen‐An; Eichhorn, Bryan W.

doi:10.1007/s10853-012-7062-2

Cited by 5 publications

(4 citation statements)

References 64 publications

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“…Because we do not employ surfactants or dispersants, there is always some degree of agglomeration after sintering, but the FGS minimizes this sintering to a large degree. The templating effect of FGS extends to other monometallic NPs, 30,33 but is not apparent in the bimetallic PtSn system. The four rGO supports give similar PtSn particle sizes with no statistical differences in diameter or agglomeration.…”

Section: Discussionmentioning

confidence: 94%

“…The rGO-supported PtSn intermetallic NPs were synthesized through modifications of our previous methods. 33,49 Specifically, Pt(acac) 2 and SnCl 4 were co-reduced in 1-octadecene using NaBEt 3 H in the presence of rGO at 200 °C. To transform the disordered PtSn alloy into its ordered intermetallic phase, the supported particles were heattreated for 2 hours at 400 °C under flowing H 2 /Ar.…”

Section: Resultsmentioning

confidence: 99%

“…For example, recent thermal studies have shown that rGO-supported iron-based NP catalysts had markedly better performance in syn-gas conversions relative to the same iron-based NP catalysts on carbon nanotubes. 21 While many electrochemical studies have been conducted on rGO-supported metal NP catalysts, [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] the influence of rGO on the electrocatalytic activity of NPs is not well understood. In the context of electrooxidation of hydrogen in the presence of CO impurities (i.e.…”

Section: Introductionmentioning

confidence: 99%

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CO tolerance of Pt and PtSn intermetallic electrocatalysts on synthetically modified reduced graphene oxide supports

et al. 2015

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Pt and PtSn intermetallic nanoparticle (NP) catalysts were grown directly on various reduced graphene oxide (rGO) supports and were characterized by a combination of X-ray photoelectron spectroscopic (XPS), Raman microscopy, transmission electron microscopy (TEM), and powder X-ray diffraction (XRD) studies. Electrochemical CO stripping and rotating disk electrochemical (RDE) experiments showed the four rGO-PtSn catalysts to be superior to the four rGO-Pt catalysts for CO and CO-H2 electrooxidation in acidic solutions regardless of the rGO support, in agreement with earlier reports on PtSn NP electrocatalysts. For the four rGO-Pt catalysts, the rGO support causes a 70 mV spread in CO oxidation peak potential (ΔEpeak) and a 200 mV spread in CO-H2 electrooxidation onset. The more oxygenated graphenes show the lowest CO oxidation potentials and the best CO tolerance. For the four rGO-PtSn intermetallic catalysts, a ∼160 mV spread in CO-H2 electrooxidation onset is observed. With the exception of the nitrogen-doped graphene (NGO), a similar trend in enhanced CO electrooxidation properties with increasing oxygen content in the rGO support is observed. The NGO-PtSn electrocatalyst was superior to the other rGO-PtSn catalysts and showed the largest improvement in CO tolerance relative to the pure Pt system. The origin of this enhancement appears to stem from the unique rGO-PtSn support interaction in this system. These results are discussed in the context of recent theoretical and experimental studies in the literature.

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Section: Discussionmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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CO tolerance of Pt and PtSn intermetallic electrocatalysts on synthetically modified reduced graphene oxide supports

et al. 2015

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“…These unique and intriguing features make this highly versatile carbon material promising in many potential applications such as transparent conducting films, sensors, and so on . Besides, due to its outstanding features and tendency to aggregate when its dispersion solutions are dried, graphene as a support, decorated with metal oxide nanospheres such as Fe 3 O 4 has recently been reported . Also, the grapheme‐based mesoporous silica materials were synthesized in the previous studies .…”

Section: Introductionmentioning

confidence: 99%

Facile preparation of magnetic graphene double‐sided mesoporous composites for the selective enrichment and analysis of endogenous peptides

et al. 2013

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In this work, magnetic graphene double-sided mesoporous nanocomposites (mag-graphene@mSiO₂) were synthesized by coating a layer of mesoporous silica materials on each side of magnetic grapheme. The surfactant (CTAB) mediated sol-gel coating was performed using tetraethyl orthosilicate as the silica source. The as-made magnetic graphene double-sided mesoporous silica composites were treated with high-temperature calcination to remove the hydroxyl on the surface. The novel double-sided materials possess high surface area (167.8 cm²/g) and large pore volume (0.2 cm³/g). The highly open pore structure presents uniform pore size (3.2 nm) and structural stability. The hydrophobic interior pore walls could ensure an efficient adsorption of target molecules through hydrophobic-hydrophobic interaction. At the same time, the magnetic Fe₃O₄ particles on both sides of the materials could simplify the process of enrichment, which plays an important role in the treatment of complex biological samples. The magnetic graphene double-sided nanocomposites were successfully applied to size-selective and specific enrichment of peptides in standard peptide mixtures, protein digest solutions, and human urine samples. Finally, the novel material was applied to selective enrichment of endogenous peptides in mouse brain tissue. The enriched endogenous peptides were then analyzed by LC-MS/MS, and 409 endogenous peptides were detected and identified. The results demonstrate that the as-made mag-graphene@mSiO₂ have powerful potential for peptidome research.

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Highly Dispersed Platinum Nanoparticles Anchored on Polypyrrole Nanospheres as Anode Catalyst for Methanol Oxidation Reaction

Zhao

Hou

et al. 2016

J Clust Sci

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Metal nanoparticle templating and electrocatalytic modification using functionalized graphene sheets

Cited by 5 publications

References 64 publications

CO tolerance of Pt and PtSn intermetallic electrocatalysts on synthetically modified reduced graphene oxide supports

CO tolerance of Pt and PtSn intermetallic electrocatalysts on synthetically modified reduced graphene oxide supports

Facile preparation of magnetic graphene double‐sided mesoporous composites for the selective enrichment and analysis of endogenous peptides

Highly Dispersed Platinum Nanoparticles Anchored on Polypyrrole Nanospheres as Anode Catalyst for Methanol Oxidation Reaction

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