Structural analysis of palladium-decorated gold nanoparticles as colloidal bimetallic catalysts

Fang, Yu-Lun; Miller, Jeffrey T.; Guo, Neng; Heck, Kimberly N.; Alvarez, Pedro J. J.; Wong, Michael S.

doi:10.1016/j.cattod.2010.08.010

Cited by 59 publications

(59 citation statements)

References 56 publications

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“…Alloying Pd with Au causes a positive shift of the Pd oxidation potential. Fang et al 23 also reported that Au in Pd-Au nanoparticles can impart oxidation resistance to Pd. The inhibition of Pd oxidation/dissolution definitely is one of the factors accounting for the improved stability of the Pt ML /Pd 9 Au 1 /C electrocatalyst, and likely is caused by the electronic effect of Au on Pd.…”

Section: Structure Of Pt ML /Pdau/c Electrocatalystmentioning

confidence: 99%

Highly stable Pt monolayer on PdAu nanoparticle electrocatalysts for the oxygen reduction reaction

et al. 2012

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stability is one of the main requirements for commercializing fuel cell electrocatalysts for automotive applications. Platinum is the best-known catalyst for oxygen reduction in cathodes, but it undergoes dissolution during potential changes while driving electric vehicles, thus hampering commercial adoption. Here we report a new class of highly stable, active electrocatalysts comprising platinum monolayers on palladium-gold alloy nanoparticles. In fuel-cell tests, this electrocatalyst with its ultra-low platinum content showed minimal degradation in activity over 100,000 cycles between potentials 0.6 and 1.0 V. under more severe conditions with a potential range of 0.6-1.4 V, again we registered no marked losses in platinum and gold despite the dissolution of palladium. These data coupled with theoretical analyses demonstrated that adding a small amount of gold to palladium and forming highly uniform nanoparticle cores make the platinum monolayer electrocatalyst significantly tolerant and very promising for the automotive application of fuel cells.

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Section: Structure Of Pt ML /Pdau/c Electrocatalystmentioning

confidence: 99%

Highly stable Pt monolayer on PdAu nanoparticle electrocatalysts for the oxygen reduction reaction

et al. 2012

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“…1,2 As one of the most studied bimetallic systems, Pd−Au catalysts have displayed promising performance for a broad range of catalytic reactions such as CO oxidation, [3][4][5] acetoxylation of ethylene to vinyl acetate, 6,7 selective oxidation of alcohols, [8][9][10][11] selective hydrogenation of unsaturated hydrocarbons, [12][13][14][15] hydrodechlorination of chlorinated compounds, [16][17][18] hydrodesulfurization of sulfur-containing molecules, 19,20 decomposition of liquid hydrocarbons for H 2 production, 21,22 and the direct synthesis of H 2 O 2 from H 2 and O 2 . 1,2 As one of the most studied bimetallic systems, Pd−Au catalysts have displayed promising performance for a broad range of catalytic reactions such as CO oxidation, [3][4][5] acetoxylation of ethylene to vinyl acetate, 6,7 selective oxidation of alcohols, [8][9][10][11] selective hydrogenation of unsaturated hydrocarbons, [12][13][14][15] hydrodechlorination of chlorinated compounds, [16][17][18] hydrodesulfurization of sulfur-containing molecules, 19,20 decomposition of liquid hydrocarbons for H 2 production, 21,22 and the direct synthesis of H 2 O 2 from H 2 and O 2 .…”

Section: Introductionmentioning

confidence: 99%

Effect of annealing in oxygen on alloy structures of Pd–Au bimetallic model catalysts

Zhang

Mullen

et al. 2015

Phys. Chem. Chem. Phys.

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It has been reported that Pd-Au bimetallic catalysts display improved catalytic performance after adequate calcination. In this study, a model catalyst study was conducted to investigate the effects of annealing in oxygen on the surface structures of Pd-Au alloys by comparing the physicochemical properties of Pd/Au(111) surfaces that were annealed in ultrahigh vacuum (UHV) versus in an oxygen ambient. Auger electron spectroscopy (AES) and Basin hopping simulations reveal that the presence of oxygen can inhibit the diffusion of surface Pd atoms into the subsurface of the Au(111) sample. Reflection-absorption infrared spectroscopy using CO as a probe molecule (CO-RAIRS) and King-Wells measurements of O2 uptake suggest that surfaces annealed in an oxygen ambient possess more contiguous Pd sites than surfaces annealed under UHV conditions. The oxygen-annealed Pd/Au(111) surface exhibited a higher activity for CO oxidation in reactive molecular beam scattering (RMBS) experiments. This enhanced activity likely results from the higher oxygen uptake and relatively facile dissociation of oxygen admolecules due to stronger adsorbate-surface interactions as suggested by temperature-programmed desorption (TPD) measurements. These observations provide fundamental insights into the surface phenomena of Pd-Au alloys, which may prove beneficial in the design of future Pd-Au catalysts.

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“…Previously, we investigated the structure-property relationship of Pd-on-Au NPs for the catalytic hydrodechlorination (HDC) of trichloroethene (TCE) and other organochlorides. [36][37][38][39][40][41][42] The catalytic NPs showed a volcano-shaped TCE HDC activity dependence on Pd surface coverage, and had signicantly higher activity and greater deactivation resistance to chloride and sulde ions than monometallic Pd catalysts. XAS (X-ray absorption spectroscopy) analysis conrmed the Au-core, Pdshell structure of the NPs.…”

Section: Introductionmentioning

confidence: 99%

Volcano-shape glycerol oxidation activity of palladium-decorated gold nanoparticles

et al. 2014

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Structural analysis of palladium-decorated gold nanoparticles as colloidal bimetallic catalysts

Cited by 59 publications

References 56 publications

Highly stable Pt monolayer on PdAu nanoparticle electrocatalysts for the oxygen reduction reaction

Highly stable Pt monolayer on PdAu nanoparticle electrocatalysts for the oxygen reduction reaction

Effect of annealing in oxygen on alloy structures of Pd–Au bimetallic model catalysts

Volcano-shape glycerol oxidation activity of palladium-decorated gold nanoparticles

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