Surface characterization of platinum electrodes

Solla-Gullón, José; Rodríguez, Paramaconi; Herrero, Enrique; Aldaz, A.; Feliu, Juan M.

doi:10.1039/b709809j

Cited by 379 publications

(506 citation statements)

References 40 publications

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“…Furthermore, intensity ratio of Peak A to Peak B alters in the hydrogen desorption region, and the Pt-O x reduction peak (Peak C) potential also shifts for the electrocatalysts. Compared to electrocatalyst EA0 with a mean Pt particle size of 2.9 nm, the occupation of Peak A for electrocatalyst EA3500 with a mean Pt size of 6.5 nm decreases, suggesting a reduced fraction of the edge and corner atoms (defects) on the Pt surface [29,30]. This surface modification derived from the Pt particle size change is believed to be responsible for the A ORR s enhancement.…”

Section: Oxygen Reduction Activitymentioning

confidence: 99%

Effect of particle size on the activity and durability of the Pt/C electrocatalyst for proton exchange membrane fuel cells

Zhang

Zhong

et al. 2012

Applied Catalysis B: Environmental

162

110

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a b s t r a c tCarbon supported Pt (Pt/C) with various average particle sizes ranging from sub 3 nm to 6.5 nm were in situ prepared and characterized at the cathode of proton exchange membrane fuel cells (PEMFCs). A clear Pt particle size effect on both the catalytic activity for oxygen reduction reaction (ORR) and the durability of the electrocatalyst was revealed. With the Pt particle size increase, both the surface specific activity and the electrochemical stability of Pt/C improved; however, the mass specific activity of Pt/C is balanced by the electrochemical surface area loss. The reduced occupation of corner and edge atoms on the Pt surface during the Pt particle size increase is believed to weaken the adsorption of the oxygenated species on Pt, and thereafter releases more available active sites for ORR and also renders the Pt surface a stronger resistance against potential cycling. It is therefore proposed that by designing the Pt microstructure with more face atoms on the surface, cathode electrocatalyst with both improved activity and enhanced durability would be developed for PEMFCs.

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Section: Oxygen Reduction Activitymentioning

confidence: 99%

Effect of particle size on the activity and durability of the Pt/C electrocatalyst for proton exchange membrane fuel cells

Zhang

Zhong

et al. 2012

Applied Catalysis B: Environmental

162

110

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“…All the Pt nanoparticles were cleaned using CO adsorption and stripping in 0.5 M H2SO4, following the procedure of refs. [41,46]. Before each experiment, a blank voltammogram was recorded in 0.5 M H2SO4.…”

Section: Methodsmentioning

confidence: 99%

“…The voltammetric profile of these samples is perfectly symmetrical, corroborating the cleanliness of the surface of the nanoparticle and the success in the removal of the chemicals used during the synthesis. A more detailed study of the voltammetric profiles depending on the different preferential surface structure of the nanoparticles and the electrolyte has been previously published by our group [46,47,49].…”

Section: Characterization Of Shape-controlled Pt Nanoparticlesmentioning

confidence: 99%

“…The voltammetric profile of a Pt sample in H2SO4 can be considered as a fingerprint of its surface structure, which allows assessing the type and ratio of the different domains present on the surface [46]. assigned to (110) sites, whereas the peak at 0.265 V corresponds to (100) defects on (111) domains or (100) short domains.…”

Section: Characterization Of Shape-controlled Pt Nanoparticlesmentioning

confidence: 99%

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Oxidation of ethanol on platinum nanoparticles: surface structure and aggregation effects in alkaline medium

Busó-Rogero

Solla-Gullón

Vidal‐Iglesias

et al. 2015

J Solid State Electrochem

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The ethanol oxidation reaction in 0.1 M NaOH on Pt nanoparticles with different shapes and loadings was investigated using electrochemical and spectroscopic techniques. The surface structure effect on this reaction was studied using well-characterized platinum nanoparticles. Regardless of the type of Pt nanoparticles used, results show that acetate is the main product with negligible CO2 formation. From the different samples used, the nanoparticles with a large amount (111) ordered domains have higher peak currents and a higher onset potential, in agreement with previous works with single crystal electrodes.In addition, spherical platinum nanoparticles supported on carbon with different loadings were used for studying possible diffusional problems of ethanol to the catalyst surface.The activity in these samples diminishes with the increase of Pt loading, due to diffusional problems of ethanol throughout the whole Pt nanoparticle layer, being the internal part of the catalyst layer inactive for the oxidation. To avoid this problem and prepare more dispersed nanoparticle catalyst layers, deposits were dried while the carbon support was rotated to favor the dispersion of the layer around the support. The improvement in the electrocatalytic activity for ethanol oxidation confirms the better performance of this procedure for depositing and drying.

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“…Thus, the different adsorption energy of hydrogen on the (100) and (111) terraces and the different step sites results in voltammetric peaks at different electrode potential. These signals have been used to elucidate the surface structure of the nanoparticles [10,11] As in the case of the nanoparticles, the reactivity of the stepped surfaces is determined by the width and symmetry of the terrace and the symmetry of the step site. By changing the terrace width, the effect of the size of the ordered domain can be studied.…”

Section: Page 3 Of 29mentioning

confidence: 99%

On the electrochemical properties of platinum stepped surfaces vicinal to the (100) pole. A computational study

Ferre-Vilaplana

Gisbert

Herrero

2014

Electrochimica Acta

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Please cite this article as: Adolfo Ferre-VilaplanaRuben GisbertEnrique Herrero On the electrochemical properties of platinum stepped surfaces vicinal to the (100) pole. A computational study (2014), http://dx.doi.org/10.1016/j.electacta. 2014.01.138 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Abstract.DFT studies on platinum stepped surfaces have been carried out in order to understand the differences in the electrochemical behavior between the surfaces with (111) and (100) terraces. Thus, adsorption energies of different species on selected surfaces have been computed. For the adsorption of Bi and Cu on the Pt(553) and Pt(711) surfaces, it has been found that that the adsorption energy on the site corresponding to the step decoration for the Pt(553) surface is ca. 0.5 eV higher than that calculated on the (111) terrace sites. On the other hand, there is no preferential adsorption site for Cu or Bi on the Pt(711) surface, since the energy differences between the different sites on this stepped surface with (100) terraces are very small. CO and OH adsorption on the surface with (100) terraces, namely the Pt(100), the Pt(711) and the Pt(510) surfaces, have been also investigated. The energy differences between step sites and terrace sites for both surfaces is very small, ca. 0.2 eV for OH adsorption and <0.1 eV for CO adsorption. For OH, the preferred adsorption mode is a bridge mode, whereas the adsorption energy for the on top and bridge configurations of CO are similar on those surfaces. The comparison with previous DFT calculations indicates that the Page 2 of 29 A c c e p t e d M a n u s c r i p t 2 perturbation created by the step on the (100) terrace is significantly smaller than that created on the (111) terraces. Thus, the modification of the electrochemical properties produced by the presence of a step in the (100) terrace is minor, in agreement with the experimental results.

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Surface characterization of platinum electrodes

Cited by 379 publications

References 40 publications

Effect of particle size on the activity and durability of the Pt/C electrocatalyst for proton exchange membrane fuel cells

Effect of particle size on the activity and durability of the Pt/C electrocatalyst for proton exchange membrane fuel cells

Oxidation of ethanol on platinum nanoparticles: surface structure and aggregation effects in alkaline medium

On the electrochemical properties of platinum stepped surfaces vicinal to the (100) pole. A computational study

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