Catalytic Activity of Carbon-Supported Pt Nanoelectrocatalysts. Why Reducing the Size of Pt Nanoparticles is Not Always Beneficial

Leontyev, Igor N.; Беленов, С. В.; Гутерман, В. Е.; Haghi-Ashtiani, Paul; Shaganov, A.; Dkhil, Brahim

doi:10.1021/jp1109477

Cited by 82 publications

(58 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been demonstrated that the ORR activity of these materials can be improved by designing nanoparticles with a certain shape. [7][8][9][10][11][12][13][14] The electrocatalysis of diO2 reduction on shape-controlled Pd nanoparticles has also been investigated recently. [15][16][17][18] Studies on Au single-crystal electrodes have shown that Au(100) is the most active lowindex plane for ORR in alkaline media.…”

Section: Introductionmentioning

confidence: 99%

Shape‐Dependent Electrocatalysis: Oxygen Reduction on Carbon‐Supported Gold Nanoparticles

et al. 2014

View full text Add to dashboard Cite

Cubic, octahedral and quasi‐spherical (two different particle sizes) Au nanoparticles are synthesised and dispersed in a carbon‐black powder. The size and morphology of the Au nanocatalysts is confirmed by transmission electron microscopy and X‐ray diffraction. Au nanospheres are approximately 5 and 30 nm in diameter, whereas the size of Au octahedra and nanocubes is approximately 40–45 nm. The electrocatalytic activity of these carbon‐supported particles towards the oxygen reduction reaction (ORR) is studied in 0.5 M H2SO4 and 0.1 M KOH solutions by using the rotating‐disk‐electrode method. The specific activity (SA) for O2 reduction is measured, and the highest SA is observed for Au nanocubes supported on carbon. The highest mass activities are found for the smallest Au nanoparticles. Tafel analysis suggests that the mechanism of the ORR on shape‐controlled Au/C catalysts is the same as on bulk Au.

show abstract

Section: Introductionmentioning

confidence: 99%

Shape‐Dependent Electrocatalysis: Oxygen Reduction on Carbon‐Supported Gold Nanoparticles

et al. 2014

View full text Add to dashboard Cite

show abstract

“…The vertical bars show the peaks associated with the Pt face‐centered cubic structure. A visual inspection of the FWHM values for the examined sample highlights the anisotropic broadening of the Bragg's peaks that we have early observed for Pt/C NPs, and that could be attributed to nonequivalent Pt NP sizes along different crystallographic directions. For gaining information about average particle size D and unit cell parameter a, the powder diffraction pattern of Pt/G was refined in a similar manner, as was done in .…”

Section: Resultsmentioning

confidence: 71%

“…It is well known that the properties of Pt/C catalysts for low temperatures fuel cell significantly depend on the microstructural characteristics of Pt nanoparticles (NPs): average particle size, strain, dispersion of grain size distribution and NPs shape ,. However, carbon support also has an important influence on catalytic activity and stability of Pt/C catalysts.…”

Section: Introductionmentioning

confidence: 99%

One‐step Simultaneous Synthesis of Graphene and Pt Nanoparticles under the Action of Pulsed Alternating Current and Electrochemical Performance of Pt/Graphene Catalysts

et al. 2017

View full text Add to dashboard Cite

Pt/graphene electrocatalyst for fuel elements has been obtained via the simultaneously electrochemical dispersion of Pt foil and expanded graphite by applying the alternating current. Raman spectroscopy and transmission electron microscopy (TEM) have revealed multilayered structure of graphene (3‐5 layers) with linear defects of graphene sheets near 1 μm. The microstructural characteristics and catalytic activity of synthesized Pt/graphene catalyst have been compared with those of Pt/Vulcan catalyst prepared under the same conditions. Pt nanoparticles of Pt/Graphene catalyst exhibit smaller average dimensions and narrower particle size distribution. It follows from the electrochemical study that the electrochemical surface area of Pt/graphene catalyst is 2.5 times higher than for Pt/Vulcan. Besides this, the activity in the electrooxidation of methanol and the stability of Pt/graphene catalyst are found to be superior to the analogous parameters of Pt/Vulcan specimen.

show abstract

“…Different organic molecules can be used to control the qualities of particles prepared. For instance, in previous works [30,31], it was shown that dimethyl sulfoxide (DMSO) in the wet chemical synthesis of platinum nanoparticles on carbon support strongly affects their microstructure. When the content of DMSO concentration increases in the solution, the average size of platinum particles decreases and their size distribution also becomes narrower.…”

Section: Introductionmentioning

confidence: 99%

Effect of ethylene glycol on electrochemical and morphological features of platinum electrodeposits from chloroplatinic acid

et al. 2015

Self Cite

View full text Add to dashboard Cite

The aim of this work was to investigate the morphology, average size, and the electrochemical behavior of platinum nanoparticles electrodeposited from water and mixed water-ethylene glycol solutions of the electrolyte of H 2 PtCl 6 and H 2 SO 4 at a rotating disk electrode coated with Vulcan XC-72 carbon powder. Cyclic voltammetry and linear sweep voltammetry were used to determine the electrochemically active surface area (ESA) and oxygen reduction reaction (ORR) activity of the prepared Pt/C materials, respectively. XRD and scanning electron microscopy were used to study the influence of the electrodeposition methods applied on the morphology of platinum particles deposited in water and mixed waterethylene glycol solutions. The average size of Pt crystallites was in the range of ca. 6-10 nm, and the average size of deposited Pt particles was in the range of ca. 30-150 nm. It was found that the presence of ethylene glycol in the electrolyte solution increased the overpotential of electrodeposition and it also strongly affected the morphology of Pt deposits when constant current electrodeposition was employed. Moreover, it was shown that pulse current electrodeposition is a more effective method compared to constant current electrodeposition method for the preparation of the Pt/Vulcan electrode with high ESA of Pt and enhanced catalytic activity toward ORR. The results obtained concerning the morphology and the spatial distribution of platinum particles electrodeposited on the surface of carbon support at different conditions demonstrate new possibilities to improve synthesis of Pt/C by electrodeposition methods.

show abstract

Catalytic Activity of Carbon-Supported Pt Nanoelectrocatalysts. Why Reducing the Size of Pt Nanoparticles is Not Always Beneficial

Cited by 82 publications

References 28 publications

Shape‐Dependent Electrocatalysis: Oxygen Reduction on Carbon‐Supported Gold Nanoparticles

Shape‐Dependent Electrocatalysis: Oxygen Reduction on Carbon‐Supported Gold Nanoparticles

One‐step Simultaneous Synthesis of Graphene and Pt Nanoparticles under the Action of Pulsed Alternating Current and Electrochemical Performance of Pt/Graphene Catalysts

Effect of ethylene glycol on electrochemical and morphological features of platinum electrodeposits from chloroplatinic acid

Contact Info

Product

Resources

About