Pd Adatom Decorated (100) Preferentially Oriented Pt Nanoparticles for Formic Acid Electrooxidation

Vidal‐Iglesias, Francisco J.; Sollá-Gullón, José; Herrero, Enrique; Aldaz, A.; Feliú, Juan M.

doi:10.1002/ange.201002501

Cited by 19 publications

(8 citation statements)

References 35 publications

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“…investigated the oxidation of formic acid and glycerol in alkaline and acidic environments using a Pd‐modified Pt electrode compared to monometallic catalysts. They found that the combined catalysts lower the onset potential for electrooxidation, and poisoning species are easily removed from the electrode surface, resulting in enhanced formic acid and glycerol oxidation [35,40,41] . This synergistic effect was also demonstrated for PtRu‐ and PdRu‐based catalysts [31,42,43] .…”

Section: Resultsmentioning

confidence: 89%

Direct and Indirect Electrooxidation of Glycerol to Value‐Added Products

Guschakowski

Schröder

2021

ChemSusChem

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In this work, different approaches for the direct and indirect electrooxidation of glycerol, a by‐product of oleochemistry and biodiesel production, for the synthesis of value‐added products and of intermediates for biofuel/electrofuel production, were investigated and compared. For the direct electrooxidation, metallic catalysts were used, whose surfaces were modified by promoters or second catalysts. Bi‐modified Pt electrodes (PtxBiy/C) served as model systems for promoter‐supported electrocatalysis, whereas IrO2‐modified RuO2 electrodes were studied as catalyst combinations, which were compared under acidic conditions with the respective monometallic catalysts (Pt/C, RuO2/Ti, IrO2/Ti). Furthermore, inorganic halide mediators (chloride, bromide, iodide) and organic nitroxyl mediators (4‐oxo‐2,2,6,6‐tetramethyl‐piperidin‐1‐oxyl and 4‐acetamido‐2,2,6,6‐tetramethyl‐piperidin‐1‐oxyl) were evaluated for indirect electrooxidation. These different approaches were discussed regarding selectivity, conversion, and coulombic efficiency of the electrochemical glycerol oxidation.

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Section: Resultsmentioning

confidence: 89%

Direct and Indirect Electrooxidation of Glycerol to Value‐Added Products

Guschakowski

Schröder

2021

ChemSusChem

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“…These studies evidenced the same structural electrocatalytic dependence, related to the presence of facets with (100) and (111) symmetries, as that observed with the model Pt surfaces. Additionally, to enhance the activity and/or to overcome the poisoning effect, the shaped Pt nanocrystals were also decorated with adatoms such as Pd, 64 Bi, 65,46 or Sb. 66 However, in these studies, the particle size of the samples (about 10 nm) is still too large from a practical point of view.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Citrate-Coated, Size-Tunable Octahedral Platinum Nanocrystals: A Novel Route for Advanced Electrocatalysts

Moglianetti

Solla-Gullón

Donati

et al. 2018

ACS Appl. Mater. Interfaces

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The development of green and scalable syntheses for the preparation of size-and shape-controlled metal nanocrystals is of high interest in many areas, including catalysis, electrocatalysis, nanomedicine, and electronics. In this work, a new synthetic approach based on the synergistic action of physical parameters and reagents produces size-tunable octahedral Pt nanocrystals, without the use of catalyst-poisoning reagents and/or difficult-to-remove coatings. The synthesis requires sodium citrate, ascorbic acid, and fine control of the reduction rate in aqueous environment. Pt octahedral nanocrystals with particle size as low as 7 nm and highly developed {111} facets have been achieved, as demonstrated by transmission electron microscopy, X-ray diffraction, and electrochemical methods. The absence of sticky molecules together with the high quality of the surface renders these nanocrystals ideal candidates in electrocatalysis. Notably, 7 nm bismuth-decorated octahedral nanocrystals exhibit superior performance for the electro-oxidation of formic acid in terms of both specific and mass activities.

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“…This effect can be achieved by deposition of the metal monatomic layers on foreign metallic surfaces. Deposition of metal overlayers on well-defined surfaces and the resulting systems’ catalytic activities become a subject of numerous electrocatalytic and surface studies. − Geometric and electronic modifications of pseudomorphic Pd overlayers affect both CO and hydrogen adsorption. , Obviously deposited monolayers differ in the dependence of the surface defects density. , Differences occur mainly at the oxide region, CO-stripping experiments and also at Pd UPD peaks during deposition. , However, the degree of modifications of catalytic properties of such surfaces is rather limited since the lattice constant characteristic for bulk material is promptly reconstructed with consecutive overlayers, generally, as early as in the second layer. − The chemical influence of the background material is also much weaker for thicker deposits. Recently, it has been shown that the unique catalytic properties can be achieved by preparation of near-surface alloys (NSA’s) .…”

Section: Introductionmentioning

confidence: 99%

CO₂ Electroreduction at Bare and Cu-Decorated Pd Pseudomorphic Layers: Catalyst Tuning by Controlled and Indirect Supporting onto Au(111)

2014

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We report here the results of electrochemical studies on CO2 electroreduction at multilayered catalyst composed of the monatomic layer of copper covering palladium overlayers (0.8-10 monolayers) deposited on the well-defined Au(111) surface. These multilayered systems were obtained by successive underpotential deposition steps: Pd on Au(111) as well as Cu on Pd/Au(111). Low index orientation of Au substrate was chosen to compare Pd overlayers with bulk Pd(111), which is known to reduce CO2 to CO adsorbates in acidic solutions. The process of CO2 electroreduction was studied by using classical transient electrochemical methods. Catalytic activity of bare Pd layers was investigated in acidic and neutral solutions. In the latter case, much higher activity of Pd overlayers was observed. The results showed that the palladium layer thickness significantly changed the catalytic activities of both bare Pd overlayers and the one Cu monolayer covered electrodes toward CO2 electroreduction. Results show that catalytic activity can be finely tuned by using the multilayered near-surface-alloy approach.

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Pd Adatom Decorated (100) Preferentially Oriented Pt Nanoparticles for Formic Acid Electrooxidation

Cited by 19 publications

References 35 publications

Direct and Indirect Electrooxidation of Glycerol to Value‐Added Products

Direct and Indirect Electrooxidation of Glycerol to Value‐Added Products

Citrate-Coated, Size-Tunable Octahedral Platinum Nanocrystals: A Novel Route for Advanced Electrocatalysts

CO₂ Electroreduction at Bare and Cu-Decorated Pd Pseudomorphic Layers: Catalyst Tuning by Controlled and Indirect Supporting onto Au(111)

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Pd Adatom Decorated (100) Preferentially Oriented Pt Nanoparticles for Formic Acid Electrooxidation

Cited by 19 publications

References 35 publications

Direct and Indirect Electrooxidation of Glycerol to Value‐Added Products

Direct and Indirect Electrooxidation of Glycerol to Value‐Added Products

Citrate-Coated, Size-Tunable Octahedral Platinum Nanocrystals: A Novel Route for Advanced Electrocatalysts

CO2 Electroreduction at Bare and Cu-Decorated Pd Pseudomorphic Layers: Catalyst Tuning by Controlled and Indirect Supporting onto Au(111)

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CO₂ Electroreduction at Bare and Cu-Decorated Pd Pseudomorphic Layers: Catalyst Tuning by Controlled and Indirect Supporting onto Au(111)