Electrochemical Behavior of Unsupported Shaped Palladium Nanoparticles

Zalineeva, Anna; Baranton, Stève; Coutanceau, Christophe; Jerkiewicz, Gregory

doi:10.1021/la5025229

Cited by 62 publications

(71 citation statements)

References 32 publications

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“…In order to clean the Pd catalyst the procedure suggested by Zalineeva et al was used [14]. Finally the catalyst was filtered, washed several times with water and dried overnight at 75 °C.…”

Section: Methodsmentioning

confidence: 99%

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Oxygen electroreduction on carbon-supported Pd nanocubes in acid solutions

Erikson

Lüsi

Sarapuu

et al. 2016

Electrochimica Acta

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Please cite this article as: Heiki Erikson, Madis Lüsi, Ave Sarapuu, Kaido Tammeveski, Jose Solla-Gullón, Juan M.Feliu, Oxygen electroreduction on carbon-supported Pd nanocubes in acid solutions, Electrochimica Acta http://dx.doi.org/10.1016/j.electacta. 2015.11.125 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. Oxygen electroreduction on carbon-supported Pd nanocubes in acid solutions Highlights• Carbon-supported Pd nanocubes of three different size and loading were prepared• The specific activity for oxygen reduction reaction is independent of Pd content• Pd nanocubes possess higher specific activity for ORR than spherical Pd nanoparticles• The ORR on carbon-supported Pd nanocubes proceed mainly via 4-electron pathway• Tafel behaviour of ORR on carbon-supported Pd nanocubes is similar to that of bulk Pd AbstractThe oxygen reduction reaction (ORR) was studied on carbon-supported cubic palladium nanoparticles of different sizes (~30 nm, ~10 nm and ~7 nm). Cetyltrimethylammonium bromide (CTAB) and polyvinylpyrrolidone (PVP) were used as capping agents to prepare the nanocubes and Pd content in the catalyst samples was 20 and 50 wt%. The surface morphology of the prepared materials was studied by transmission electron microscopy (TEM). The catalyst materials were electrochemically characterised by cyclic voltammetry and CO stripping experiments. The rotating disk electrode (RDE) method was employed for ORR studies in 0.5 M H 2 SO 4 and 0.1 M HClO 4 solutions. The ORR results revealed that the specific activity of cubic Pd nanoparticles is higher than that of spherical Pd particles and does not depend on the Pd content in the catalyst, but decreases with decreasing the size of Pd nanocubes. Mass activity of Pd nanocubes increased with decreasing the particle size. The ORR proceeds mainly via 4-electron pathway and the reaction mechanism is similar to that on bulk Pd.

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Section: Methodsmentioning

confidence: 99%

“…The enhanced electrocatalytic properties are suggested to arise not from their crystallographic structure, but from the adsorbed polyallylamine that is used in the synthesis of these Pd particles. Recently, it has been shown that the activity of hydrogen evolution reaction depends on the shape of Pd nanoparticles [14].…”

Section: Introductionmentioning

confidence: 99%

Oxygen electroreduction on carbon-supported Pd nanocubes in acid solutions

Erikson

Lüsi

Sarapuu

et al. 2016

Electrochimica Acta

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“…In the whole group of Pd binary alloys, which are known as good catalysts and hydrogen absorbers [1][2][3][4][5][6], two systems deserve a special attention, namely Pd-Rh and Pd-Ru alloys. These systems are exceptional, because for certain composition ranges, the maximum amounts of absorbed hydrogen are greater than in the case of pure Pd [1][2][3][4][5][6][7][8][9][10][11][12][13][14], while other Pd alloys in their full composition range are always characterized by a weaker maximum ability to absorb hydrogen [1][2][3][4][5][6][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…These systems are exceptional, because for certain composition ranges, the maximum amounts of absorbed hydrogen are greater than in the case of pure Pd [1][2][3][4][5][6][7][8][9][10][11][12][13][14], while other Pd alloys in their full composition range are always characterized by a weaker maximum ability to absorb hydrogen [1][2][3][4][5][6][15][16][17][18][19]. In most Pd alloys, the gaps in the Pd d-band are filled by the electrons originating from the alloying metal, and therefore, less electronic states remain free for the electrons to be accepted from absorbing hydrogen, which leads to a deterioration of the absorption capacity [16].…”

Section: Introductionmentioning

confidence: 99%

“…In most Pd alloys, the gaps in the Pd d-band are filled by the electrons originating from the alloying metal, and therefore, less electronic states remain free for the electrons to be accepted from absorbing hydrogen, which leads to a deterioration of the absorption capacity [16]. Only for Pd-Rh and Pd-Ru alloys containing small amounts of Rh or Ru in the bulk, the number of gaps in the Pd d-band below the Fermi level is greater, which is manifested by an enhanced ability to absorb hydrogen [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Temperature, Electrode Potential, and Bulk Composition on Hydrogen Electrosorption into Palladium-Ruthenium Alloys—Comparative Study with Other Binary Systems

2018

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The influence of temperature between 283 K and 328 K on hydrogen electrosorption into Pd-Ru alloys in the bulk composition range 87-100% at. Pd was studied voltammetrically and chronoamperometrically in 0.5 M H 2 SO 4 solution. The maximum alloy ability to absorb hydrogen decreases with increasing temperature. The extent of hydrogen absorption/desorption hysteresis is slightly reduced with increasing temperature and markedly reduced with increasing Ru bulk content. Both increasing temperature and Ru bulk content results not only in a decrease in the thermodynamic stability of the hydride phase but also in an improvement in the kinetics of hydrogen electrosorption. Pd-Ru alloys containing more than ca. 97% at. Pd absorb more hydrogen than pure Pd, while further Ru additive results in a significant deterioration of the alloy ability to absorb hydrogen. The data on the influence of temperature and alloy bulk composition on the processes of hydrogen electrosorption in Pd binary alloys with Ru, Rh, Pt, and Au have been compared.

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Facile Synthesis of Palladium‐Based Nanocrystals with Different Crystal Phases and a Comparison of Their Catalytic Properties

et al. 2021

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enhanced catalytic activities toward various structure-sensitive reactions. [3] In the case of Pt, for example, its activity toward oxygen reduction can be enhanced by five times by switching from cubic nanocrystals enclosed by {100} facets to the octahedral counterparts covered by {111} facets. [4] This and many other examples demonstrate that one can increase the figures of merit of metal nanocrystals in catalytic applications by controlling the arrangement of atoms. [5,6] Most of the prior studies, however, only dealt with metal nanocrystals in their native crystal structures without looking into polymorphism, the ability of a solid to crystallize in metastable phases distinct from the native, thermodynamically stable one. [7] Owing to the corresponding changes in surface and electronic structures, phase-controlled synthesis would offer another viable avenue to maneuver the catalytic properties of metal nanocrystals. [6,[8][9][10] Metastable phases have been achieved for a number of metals, including face-centered cubic (fcc) Co, hexagonally close-packed (hcp) -Ag and Au, 4H-Ag and Au, as well as fcc-Ru and hcp-Rh. [10,11] Recently, hcp-Pd was also reported, but phase-controlled synthesis of Pd nanocrystals remains in its infancy. [12] In general, phase control can be achieved through a variety of methods, including kinetically controlled growth, pressure-induced phase transition, and template-directed synthesis. [7] For kinetically controlled growth, the slow reduction kinetics achieved through control over the reaction temperature and reagents help induce unusual atomic stacking in the resultant nanocrystals, but it is difficult to rationally extend this method to different systems. [7] Pressure-induced phase transition relies on the application of high pressure to nanocrystals for the removal of stacking faults and shifting of the crystal structure, but it is mainly of theoretical interest because the nanocrystals revert to their native phases when the pressure is removed. [7] In template-directed synthesis, nanocrystals with a specific crystal structure can serve as seeds to dictate the nucleation and growth of a metal featuring a different crystal structure. [13] Under proper conditions (such as reduction kinetics, temperature, and use of stabilizing ligands), the crystal structure of the seed can be extended to the shell, resulting in the formation of a metastable core-shell nanocrystal. [7,13,14] As a major advantage, template-directed synthesis can be readily A relatively unexplored aspect of noble-metal nanomaterials is polymorphism, or their ability to crystallize in different crystal phases. Here, a method is reported for the facile synthesis of Ru@Pd core-shell nanocrystals featuring polymorphism, with the core made of hexagonally close-packed (hcp)-Ru while the Pd shell takes either an hcp or face-centered cubic (fcc) phase.The polymorphism shows a dependence on the shell thickness, with shells thinner than ≈1.4 nm taking the hcp phase whereas the thicker ones revert to fcc. The injection rate pro...

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Electrochemical Behavior of Unsupported Shaped Palladium Nanoparticles

Cited by 62 publications

References 32 publications

Oxygen electroreduction on carbon-supported Pd nanocubes in acid solutions

Oxygen electroreduction on carbon-supported Pd nanocubes in acid solutions

Effect of Temperature, Electrode Potential, and Bulk Composition on Hydrogen Electrosorption into Palladium-Ruthenium Alloys—Comparative Study with Other Binary Systems

Facile Synthesis of Palladium‐Based Nanocrystals with Different Crystal Phases and a Comparison of Their Catalytic Properties

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