Catalytic activity of unsupported Pd-Pt nanoalloys with low Pt content towards formic acid oxidation

Gralec, Barbara; Lewera, Adam

doi:10.1016/j.apcatb.2016.03.073

Cited by 43 publications

(16 citation statements)

References 58 publications

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“…The detailed shape of voltammograms is the result of all these factors and is therefore difficult to predict. Comparable results and observations were given by the authors of other works, where observed that Pd-Pt nanoparticles exhibited higher formic acid electrooxidation current density during voltametric experiments in comparison to pure Pd [44] and lower start potential of the electrooxidation reactions with reference to pure Pt. Analysis of the data indicates that the addition of Pd enhances the rate of formic acid electrooxidation via a direct reaction mechanism [45].…”

Section: Testssupporting

confidence: 85%

TiO2 Nanotubes with Pt and Pd Nanoparticles as Catalysts for Electro-Oxidation of Formic Acid

et al. 2020

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In the present work, the magnetron sputtering technique was used to prepare new catalysts of formic acid electrooxidation based on TiO2 nanotubes decorated with Pt (platinum), Pd (palladium) or Pd + Pt nanoparticles. TiO2 nanotubes (TiO2 NTs) with strictly defined geometry were produced by anodization of Ti foil and Ti mesh in a mixture of glycerol and water with ammonium fluoride electrolyte. The above mentioned catalytically active metal nanoparticles (NPs) were located mainly on the top of the TiO2 NTs, forming ‘rings’ and agglomerates. A part of metal nanoparticles decorated also TiO2 NTs walls, thus providing sufficient electronic conductivity for electron transportation between the metal nanoparticle rings and Ti current collector. The electrocatalytic activity of the TiO2 NTs/Ti foil, decorated by Pt, Pd and/or Pd + Pt NPs was investigated by cyclic voltammetry (CV) and new Pd/TiO2 NTs/Ti mesh catalyst was additionally tested in a direct formic acid fuel cell (DFAFC). The results so obtained were compared with commercial catalyst—Pd/Vulcan. CV tests have shown for carbon supported catalysts, that the activity of TiO2 NTs decorated with Pd was considerably higher than that one decorated with Pt. Moreover, for TiO2 NTs supported Pd catalyst specific activity (per mg of metal) was higher than that for well dispersed carbon supported commercial catalyst. The tests at DFAFC have revealed also that the maximum of specific power for 0.2 Pd/TiO2 catalyst was 70% higher than that of the commercial one, Pd/Vulcan. Morphological features, and/or peculiarities, as well as surface composition of the resulting catalysts have been studied by scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM), and chemical surface analytical methods (X-ray photoelectron spectroscopy—XPS; Auger electron spectroscopy—AES).

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Section: Testssupporting

confidence: 85%

TiO2 Nanotubes with Pt and Pd Nanoparticles as Catalysts for Electro-Oxidation of Formic Acid

et al. 2020

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“…It is already known that by adding Pt to Pd, the catalytic activity for formic acid oxidation can be increased . The Pt@Pd/C electrocatalyst, synthesized by our electroless Ag UPD‐Galvanic replacement technique, was tested for formic acid oxidation after removing AgCl electrochemically.…”

Section: Figurementioning

confidence: 99%

“…It is already known that by adding Pt to Pd, the catalytic activity for formic acid oxidation can be increased. [27][28][29] The Pt@Pd/C electrocatalyst, synthesized by our electroless Ag UPD-Galvanic replacement technique, was tested for formic acid oxidation after removing AgCl electrochemically. Cyclic voltammetry technique was used to remove AgCl by varying the potential from À 0.68 to 0.5 V (vs Hg/Hg 2 SO 4 ), at lower potential, AgCl is reduced to Ag and it was stripped off at higher potential.…”

mentioning

confidence: 99%

Scale‐Up Process of Core@Shell Monolayer Catalyst without Active Potential Control through Electroless Underpotential Deposition Galvanic Replacement

Mahesh

Sarkar

2018

ChemistrySelect

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Core@shell monolayer catalysts have dual advantages in electrocatalysis, cost of the catalyst is minimized by depositing expensive metal as a monolayer shell and the catalytic activity can be enhanced by selecting an appropriate core metal. In this communication, a novel chemically assisted underpotential deposition process to fabricate core@shell monolayer nanoparticles in bulk scale has been introduced. Ag(shell)@Pd(core)/C nanoparticles have been prepared by this electroless underpotential deposition method. The thickness of the Ag shell has been calculated as one atomic layer from XPS analysis. Core‐shell structure of nanoparticles has been confirmed by STEM characterization. Further, Pt(shell)@Pd(core)/C nanoparticles have been engineered from Ag@Pd/C nanoparticles by Galvanic replacement of Ag by Pt. This Pt@Pd/C electrocatalyst has been tested for formic acid oxidation.

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“…Pd can be a good choice for the third element of the PtBi catalyst because Pd is very stable under acid conditions because of its stable electronic structure. In addition, BiPd [19,20], PdPt [21,22], and BiPt [13] catalysts could prevent the poisoning of Pt by CO due to the less CO chemisorption by the downshift of the dband center.…”

Section: Introductionmentioning

confidence: 99%

Irreversibly Adsorbed Tri-metallic PtBiPd/C Electrocatalyst for the Efficient Formic Acid Oxidation Reaction

Sui

Rhee

et al. 2020

J. Electrochem. Sci. Technol

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The PtBi/C and PtBiPd/C electrocatalysts were synthesized via the irreversible adsorption of Pd and Bi ions precursors on commercial Pt/C catalysts. XRD and XPS revealed the formation of an alloy structure among Pt, Bi, and Pd atoms. The current of direct formic acid oxidation (I d) increased ~ 8 and 16 times for the PtBi/C and PtBiPd/C catalysts, respectively, than that of commercial Pt/C because of the electronic, geometric, and third body effects. In addition, the increased ratio between the current of direct formic acid oxidation (I d) and the current of indirect formic acid oxidation (I i n d

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Catalytic activity of unsupported Pd-Pt nanoalloys with low Pt content towards formic acid oxidation

Cited by 43 publications

References 58 publications

TiO2 Nanotubes with Pt and Pd Nanoparticles as Catalysts for Electro-Oxidation of Formic Acid

TiO2 Nanotubes with Pt and Pd Nanoparticles as Catalysts for Electro-Oxidation of Formic Acid

Scale‐Up Process of Core@Shell Monolayer Catalyst without Active Potential Control through Electroless Underpotential Deposition Galvanic Replacement

Irreversibly Adsorbed Tri-metallic PtBiPd/C Electrocatalyst for the Efficient Formic Acid Oxidation Reaction

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