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Uniform Functionalization of High-Quality Graphene with Platinum Nanoparticles for Electrocatalytic Water Reduction.

Mazzaro R, Boni A, Valenti G, Marcaccio M, Paolucci F, Ortolani L, Morandi V, Ceroni P, Bergamini G - ChemistryOpen (2015)

Bottom Line: The turnover frequency at zero overpotential (TOF0 in 0.1 m phosphate buffer, pH 6.8) was determined to be approximately 4600 h(-1).This remarkably high value is likely due to the optimal dispersion of the platinum nanoparticles on the graphene substrate, which enables the material to be loaded with only very small amounts of the noble metal (i.e., Pt) despite the very highly active surface.This study provides a new outlook on the design of novel materials for the development of robust and scalable water-splitting devices.

View Article: PubMed Central - PubMed

Affiliation: Dipartimento di Chimica "G. Ciamician", Università di Bologna Via Selmi 2, 40126, Bologna, Italy ; Institute for Microelectronics & Microsystems (IMM)-Bologna, National Research Council (CNR) Via Gobetti 101, 40129, Bologna, Italy.

ABSTRACT
Graphene-metal composites have potential as novel catalysts due to their unique electrical properties. Here, we report the synthesis of a composite material comprised of monodispersed platinum nanoparticles on high-quality graphene obtained by using two different exfoliation techniques. The material, prepared via an easy, low-cost and reproducible procedure, was evaluated as an electrocatalyst for the hydrogen evolution reaction. The turnover frequency at zero overpotential (TOF0 in 0.1 m phosphate buffer, pH 6.8) was determined to be approximately 4600 h(-1). This remarkably high value is likely due to the optimal dispersion of the platinum nanoparticles on the graphene substrate, which enables the material to be loaded with only very small amounts of the noble metal (i.e., Pt) despite the very highly active surface. This study provides a new outlook on the design of novel materials for the development of robust and scalable water-splitting devices.

No MeSH data available.


Related in: MedlinePlus

High-resolution transmission electron microscopy (HR-TEM) images of graphene sheets exfoliated by using a) the PCA-G method involving 1-pyrenecarboxylic acid (PCA) and b) the NMP-G method involving 1-methyl-2-pyrrolidone (NMP); histograms above show the corresponding distribution. c) Comparison of the cyclic voltammetries (CVs) for the PCA-G Pt (—) and NMP-G Pt (—) samples; potentials are referred versus a standard saturated calomel electrode (SCE). v=0.05 V s−1, argon-saturated phosphate buffer solution (pH 6.8).
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fig01: High-resolution transmission electron microscopy (HR-TEM) images of graphene sheets exfoliated by using a) the PCA-G method involving 1-pyrenecarboxylic acid (PCA) and b) the NMP-G method involving 1-methyl-2-pyrrolidone (NMP); histograms above show the corresponding distribution. c) Comparison of the cyclic voltammetries (CVs) for the PCA-G Pt (—) and NMP-G Pt (—) samples; potentials are referred versus a standard saturated calomel electrode (SCE). v=0.05 V s−1, argon-saturated phosphate buffer solution (pH 6.8).

Mentions: Figure 1 shows the results of high-resolution transmission electron microscopy (HR-TEM) characterization of the products of the two exfoliation techniques. Statistical analysis of the number of layers was made by directly counting the (0,0,2) fringes at the flake folding edges, which correlate directly to the number of layers. As highlighted by the example micrographs shown in Figure 1, the degree of exfoliation was found to be slightly higher, in particular in term of distribution, for the NMP-G sample.


Uniform Functionalization of High-Quality Graphene with Platinum Nanoparticles for Electrocatalytic Water Reduction.

Mazzaro R, Boni A, Valenti G, Marcaccio M, Paolucci F, Ortolani L, Morandi V, Ceroni P, Bergamini G - ChemistryOpen (2015)

High-resolution transmission electron microscopy (HR-TEM) images of graphene sheets exfoliated by using a) the PCA-G method involving 1-pyrenecarboxylic acid (PCA) and b) the NMP-G method involving 1-methyl-2-pyrrolidone (NMP); histograms above show the corresponding distribution. c) Comparison of the cyclic voltammetries (CVs) for the PCA-G Pt (—) and NMP-G Pt (—) samples; potentials are referred versus a standard saturated calomel electrode (SCE). v=0.05 V s−1, argon-saturated phosphate buffer solution (pH 6.8).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4522175&req=5

fig01: High-resolution transmission electron microscopy (HR-TEM) images of graphene sheets exfoliated by using a) the PCA-G method involving 1-pyrenecarboxylic acid (PCA) and b) the NMP-G method involving 1-methyl-2-pyrrolidone (NMP); histograms above show the corresponding distribution. c) Comparison of the cyclic voltammetries (CVs) for the PCA-G Pt (—) and NMP-G Pt (—) samples; potentials are referred versus a standard saturated calomel electrode (SCE). v=0.05 V s−1, argon-saturated phosphate buffer solution (pH 6.8).
Mentions: Figure 1 shows the results of high-resolution transmission electron microscopy (HR-TEM) characterization of the products of the two exfoliation techniques. Statistical analysis of the number of layers was made by directly counting the (0,0,2) fringes at the flake folding edges, which correlate directly to the number of layers. As highlighted by the example micrographs shown in Figure 1, the degree of exfoliation was found to be slightly higher, in particular in term of distribution, for the NMP-G sample.

Bottom Line: The turnover frequency at zero overpotential (TOF0 in 0.1 m phosphate buffer, pH 6.8) was determined to be approximately 4600 h(-1).This remarkably high value is likely due to the optimal dispersion of the platinum nanoparticles on the graphene substrate, which enables the material to be loaded with only very small amounts of the noble metal (i.e., Pt) despite the very highly active surface.This study provides a new outlook on the design of novel materials for the development of robust and scalable water-splitting devices.

View Article: PubMed Central - PubMed

Affiliation: Dipartimento di Chimica "G. Ciamician", Università di Bologna Via Selmi 2, 40126, Bologna, Italy ; Institute for Microelectronics & Microsystems (IMM)-Bologna, National Research Council (CNR) Via Gobetti 101, 40129, Bologna, Italy.

ABSTRACT
Graphene-metal composites have potential as novel catalysts due to their unique electrical properties. Here, we report the synthesis of a composite material comprised of monodispersed platinum nanoparticles on high-quality graphene obtained by using two different exfoliation techniques. The material, prepared via an easy, low-cost and reproducible procedure, was evaluated as an electrocatalyst for the hydrogen evolution reaction. The turnover frequency at zero overpotential (TOF0 in 0.1 m phosphate buffer, pH 6.8) was determined to be approximately 4600 h(-1). This remarkably high value is likely due to the optimal dispersion of the platinum nanoparticles on the graphene substrate, which enables the material to be loaded with only very small amounts of the noble metal (i.e., Pt) despite the very highly active surface. This study provides a new outlook on the design of novel materials for the development of robust and scalable water-splitting devices.

No MeSH data available.


Related in: MedlinePlus