Electrochemical promotion of CO combustion over non-percolated Pt particles supported on YSZ using a novel bipolar configuration

Xia, Chun; Hugentobler, M.; Li, Yongdan; Fóti, György; Comninellis, Christos; Harbich, W.

doi:10.1016/j.elecom.2010.11.026

Cited by 19 publications

(6 citation statements)

References 22 publications

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“…Xia et al , have utilized this configuration to investigate CO oxidation over nanodisperded Pt particle supported on YSZ in vacuum. Figure A shows the size distribution of Pt nanoparticles.…”

Section: Electrochemical Promotion Of Catalysis (Epoc)mentioning

confidence: 99%

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Ionically Conducting Ceramics as Active Catalyst Supports

et al. 2013

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Section: Electrochemical Promotion Of Catalysis (Epoc)mentioning

confidence: 99%

Section: Electrochemical Promotion Of Catalysis (Epoc)mentioning

confidence: 99%

Ionically Conducting Ceramics as Active Catalyst Supports

et al. 2013

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“…The falloff in mass activity for smaller particles was attributed to changes in the availability of the most active terrace sites with decreasing particle size. To address size effects directly, particularly in the subnanometer size range, a number of groups have developed experiments allowing electrochemical studies of electrodes prepared by deposition of mass-selected clusters. − Three groups have reported size-selected studies of aqueous ORR. These have disagreed on the question of whether mass activity falls off at small sizes or not. ,, Another approach to controlling size in electrocatalysts is to form metal particles using dendrimers to titrate the number of metal atoms, as pioneered by Crooks and co-workers .…”

Section: Introductionmentioning

confidence: 99%

Cluster Size Controls Branching between Water and Hydrogen Peroxide Production in Electrochemical Oxygen Reduction at Pt_n/ITO

et al. 2015

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Deposition of size-selected Pt n clusters on indium tin oxide (ITO) films in ultrahigh vacuum was used to create electrodes with catalytic sites of controlled size. We report a study of the oxygen reduction reaction (ORR) in 0.1 M HClO 4 at size-selected Pt n /ITO electrodes that were prepared and characterized without exposure to laboratory air. It was found that the ORR onset potential was size-dependent, varying from ∼0.66 V vs NHE for Pt 1 /ITO to ∼0.78 V vs NHE for Pt n (n ≥ 10). The maximum ORR currents per gram of Pt were found to be about an order of magnitude higher than that for ITO with 5 nm Pt particles. The branching ratio between the production of water and hydrogen peroxide in ORR was found to be strongly size-dependent. For 5 nm Pt particles on ITO or for polycrystalline Pt, little H 2 O 2 was produced, but as cluster size was decreased, the H 2 O 2 branching became large, suggesting that small Pt clusters could be useful selective catalysts for H 2 O 2 electrosynthesis. Because there was no obvious correlation of ORR activity with Pt n electronic properties, as probed by photoemission, the effect of size on branching is tentatively attributed to size of the available oxygen binding sites.

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“…In collaboration with Arenz, this group has also reported studies of electrocatalytic activity of supported Pt clusters [67][68][69][70][71]. Harbich and co-workers have carried out STM and reactivity studies of deposited clusters, and recently reported studies focusing on the fundamentals of CO oxidation over Pt n /TiO 2 [72,73], and of electrocatalysis, using an approach where Pt clusters are deposited directly on a solid electrolyte, allowing electrochemistry to be studied in vacuo [7,74]. The Vajda group has an active program where size-selected catalysts are studied in a variety of reactors, recently focusing on in operando studies using tools such as X-ray scattering, to probe chemistry under realistic reaction conditions [4,9,10,[75][76][77][78][79][80][81][82][83].…”

Section: Introductionmentioning

confidence: 96%

Reprint of “Mass-selected supported cluster catalysts: Size effects on CO oxidation activity, electronic structure, and thermal stability of Pd /alumina (n≤ 30) model catalysts”

Kane

Roberts

Anderson

2015

International Journal of Mass Spectrometry

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a b s t r a c tAn intense, mass-selected cluster source for preparation of model supported clusters is described, and results are presented for cluster size effects on CO oxidation activity for Pd n clusters supported on alumina films grown on Re(0001) or Ta(110) single crystals. The electronic structure of the samples was probed by X-ray and UV photoelectron spectroscopy, and low energy ion scattering was used to probe binding morphology. The Pd n activity was monitored via both steady state and temperature-programmed reaction (TPR) methods. In both cases, the samples appear to be stable in repeated reaction cycles for temperatures up to 600 K. In the TPR experiments, CO oxidation activity per Pd atom varied by ∼40% between the most and least reactive clusters, while under steady state conditions, the activity varied by ∼55%, but with a different pattern of activity vs. size. The difference in the effects of cluster size is attributed to the fact that TPR experiments were done under conditions where the rate-limiting step is oxygen activation, while the steady-state reactivity conditions were most sensitive to the strength of CO binding. Two distinct types of CO binding were observed and characterized by a combination of temperature-programmed desorption (TPD), and temperature-dependent ISS (TD-ISS).

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Electrochemical promotion of CO combustion over non-percolated Pt particles supported on YSZ using a novel bipolar configuration

Cited by 19 publications

References 22 publications

Ionically Conducting Ceramics as Active Catalyst Supports

Ionically Conducting Ceramics as Active Catalyst Supports

Cluster Size Controls Branching between Water and Hydrogen Peroxide Production in Electrochemical Oxygen Reduction at Pt_n/ITO

Reprint of “Mass-selected supported cluster catalysts: Size effects on CO oxidation activity, electronic structure, and thermal stability of Pd /alumina (n≤ 30) model catalysts”

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Electrochemical promotion of CO combustion over non-percolated Pt particles supported on YSZ using a novel bipolar configuration

Cited by 19 publications

References 22 publications

Ionically Conducting Ceramics as Active Catalyst Supports

Ionically Conducting Ceramics as Active Catalyst Supports

Cluster Size Controls Branching between Water and Hydrogen Peroxide Production in Electrochemical Oxygen Reduction at Ptn/ITO

Reprint of “Mass-selected supported cluster catalysts: Size effects on CO oxidation activity, electronic structure, and thermal stability of Pd /alumina (n≤ 30) model catalysts”

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Cluster Size Controls Branching between Water and Hydrogen Peroxide Production in Electrochemical Oxygen Reduction at Pt_n/ITO