An electrochemical, ellipsometric, and surface science investigation of the PtRu bulk alloy surface

Ticanelli, E.; Beery, J. G.; Paffett, Mark T.; Gottesfeld, S.

doi:10.1016/0022-0728(89)85162-9

Cited by 156 publications

(87 citation statements)

References 32 publications

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“…The dissociative chemisorption of methanol is accomplished on platinum, whereas an oxyhydroxide forms on ruthenium and is responsible for the oxidation of the carbonaceous adsorbate (for example, methanol) to CO 2 . 5,6 In this work, the Pt nanoparticles/Mo 2 C nanotube catalyst outperforms the commercial Pt/C and PtRu/C catalysts even with a lower platinum loading, which can be attributed to several key reasons. First, the Pt nanoparticles on Mo 2 C nanotubes synthesized via the controlled ALD process were dispersed and exhibited smaller particle sizes relative to the commercial Pt/C catalyst.…”

Section: Electrochemical Performancementioning

confidence: 76%

“…One main challenge is the poor electrocatalytic activity in the methanol oxidation reaction (MOR); another is the occurrence of serious carbon monoxide (CO) poisoning at the anode of the Pt catalyst. A promising strategy for addressing these challenges is to alloy Pt with other oxophilic elements such as Ru, [4][5][6][7] Mo [8][9][10][11] and Sn. 12 Traditionally, nanoparticles of Pt and its alloys with Ru are selected as the best catalyst owing to their relatively high activity and durability for MOR.…”

Section: Introductionmentioning

confidence: 99%

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A highly active, stable and synergistic Pt nanoparticles/Mo2C nanotube catalyst for methanol electro-oxidation

Zhang

Yang

et al. 2015

NPG Asia Mater

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Poor electrocatalytic activity and carbon monoxide (CO) poisoning of the anode in Pt-based catalysts are still two major challenges facing direct methanol fuel cells. Herein, we demonstrate a highly active and stable Pt nanoparticle/Mo 2 C nanotube catalyst for methanol electro-oxidation. Pt nanoparticles were deposited on Mo 2 C nanotubes using a controllable atomic layer deposition (ALD) technique. This catalyst showed much higher catalytic activity for methanol oxidation and superior CO tolerance, when compared with those of the conventional Pt/C and PtRu/C catalysts. The experimental evidence from X-ray absorption near-edge structure spectroscopy and scanning transmission X-ray microscopy clearly support a strong chemical interaction between the Pt nanoparticles and Mo 2 C nanotubes. Our studies show that the existence of Mo 2 C not only minimizes the required Pt usage but also significantly enhances CO tolerance and thus improves their durability. These results provide a promising strategy for the design of highly active next-generation catalysts.

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Section: Electrochemical Performancementioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

A highly active, stable and synergistic Pt nanoparticles/Mo2C nanotube catalyst for methanol electro-oxidation

Zhang

Yang

et al. 2015

NPG Asia Mater

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“…This behaviour is in agreement with the results found for bulk Pt05Run. 5 alloy [17]. The optical response alters in the presence of methanol (0.33M) as shown by the dashed curve of Fig.…”

Section: Measurementsmentioning

confidence: 93%

On the role of Ru and Sn as promotors of methanol electro-oxidation over Pt

1995

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The role of Ru and Sn on the methanol oxidation over Pt was investigated for three different systems viz. Pt covered with adatom layers of Ru and Sn, electro-codeposited Pt-Ru and carbon supported Pt-Ru. By following the oxide growth on the Pt-promoter metal electrodes with ellipsometry it was found that in the presence of methanol the surface oxides of the promotor metal are no longer present on the surface. This supports the bifunctional model of the promotor action. DEMS measurements at Pt with submonolayer coverage of Ru or Sn revealed that the current efficiency of the methanol oxidation to CO 2 is increased in the presence of Ru or Sn and that the onset potential of the oxidation keeps lowering with increasing amounts of the promoting metal. On electrodeposited Pt-Ru systems the adsorption of methanol already takes place at potentials in the hydrogen range. These results seem to point to an electronic (ligand) effect. This is further corroborated by activity measurements at carbon supported Pt-Ru with very small particles, which show a tenfold higher activity compared with the Ru-free system.It is concluded that the promoting action of Ru and Sn may involve both a bifunctional and an electronic (ligand) effect.

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“…0.2 V lower than that of Pt/C. It is well known that Ru is a good promoter for water activation, which occurs with the formation of Ru-OH at low potential 0.2 V vs. RHE 21 . The chemisorbed oxygenated species on the Ru surface promote CO oxidation to CO 2 at low potentials.…”

Section: Co Stripping Voltammetrymentioning

confidence: 93%

Electronic Modification Effects Induced by Fe in Pt-Ru-Fe Ternary Catalyst on the Electrooxidation of CO/H<sub>2</sub> and Methanol

et al. 2012

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An electrochemical, ellipsometric, and surface science investigation of the PtRu bulk alloy surface

Cited by 156 publications

References 32 publications

A highly active, stable and synergistic Pt nanoparticles/Mo2C nanotube catalyst for methanol electro-oxidation

A highly active, stable and synergistic Pt nanoparticles/Mo2C nanotube catalyst for methanol electro-oxidation

On the role of Ru and Sn as promotors of methanol electro-oxidation over Pt

Electronic Modification Effects Induced by Fe in Pt-Ru-Fe Ternary Catalyst on the Electrooxidation of CO/H<sub>2</sub> and Methanol

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