The modification of Pt(110) by ruthenium: CO adsorption and electro-oxidation

Davies, Julie Olivia; Hayden, Brian E.; Pegg, D. J.

doi:10.1016/s0039-6028(00)00743-3

Cited by 86 publications

(77 citation statements)

References 40 publications

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“…Considering the simple reaction scheme for methanol oxidation (and assuming a similar one for CO oxidation from dissolved CO), the electronic contribution made by ruthenium to the top layer Pt atoms influence the bond strength with CO and oxygen-containing species [37][38][39]. Consequently, the effect of Pt incorporated Ru improves the formation of PtOH(ads), Eq.…”

Section: Original Research Papermentioning

confidence: 99%

High‐Temperature Electrochemical Characterization of Ru Core Pt Shell Fuel Cell Catalyst

et al. 2011

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The electrooxidation of methanol was studied at elevated temperature and pressure by cyclic voltammetry and constant potential experiments at real fuel cell electrocatalysts. Ruthenium core and platinum shell nanoparticles were synthesized by a sequential polyol route, and characterized electrochemically by CO stripping at room temperature to quickly confirm the structure of the synthesized core–shell structure as compared to pure commercial Pt/C and Pt–Ru/C alloy catalysts. A significant promotional effect of Pt decorated Ru cores in the methanol oxidation was found at elevated temperatures and rather high‐electrode potentials. A negative potential shift of the methanol oxidation peak is observed for the Ru@Pt/C core–shell catalyst at moderate temperatures, while a significant shift to positive potentials of the methanol oxidation peak occurs for Pt/C catalysts. The onset potential for methanol oxidation is lowered some 200 mV from room temperature and up to 120 °C for all electrocatalysts, indicating that it is the thermal activity of water adsorption that dictates the onset potential. Direct methanol fuel cell experiments showed only small performance differences between Ru@Pt/C and Pt/C anode electrocatalysts, suggesting the necessity of render possible the formation of surface oxygen species at lower electrode potentials.

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Section: Original Research Papermentioning

confidence: 99%

High‐Temperature Electrochemical Characterization of Ru Core Pt Shell Fuel Cell Catalyst

et al. 2011

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“…The promotion effect has been mainly discussed based on the so-called "bifunctional effect" [16, or "ligand effect" [3,[31][32][33][34]37, or a mixture of both [31][32][33][34]37,46,67,68]. The bifunctional mechanism, proposed by Watanabe and Motoo [20,21], proposes that Ru acts as a promoter for the oxidation of the strongly bound CO ad on Pt by supplying an oxygen source (Ru-OH ad ).…”

Section: Introductionmentioning

confidence: 99%

Kinetics of CH3OH oxidation on PtRu/C studied by impedance and CO stripping voltammetry

Sugimoto

Aoyama

Kawaguchi

et al. 2005

Journal of Electroanalytical Chemistry

114

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The kinetics of the CH 3 OH oxidation reaction at 60°C on well-alloyed platinum-ruthenium supported on carbon (Pt 50 Ru 50 /C) was studied by electrochemical impedance spectroscopy and compared with carbon-supported platinum (Pt/C). The reaction rate of the overall CH 3 OH oxidation increased with increasing electrode potential for both Pt/C and PtRu/C. In the case of Pt/C, when the electrode potential was E ≤ 450 mV vs. RHE only a capacitive behavior was observed. Resistive and pseudo-inductive behaviors were evident above 500 and 600 mV vs. RHE. In the case of PtRu/C, a similar change in behavior was observed, except that the behaviors

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“…High-surface area PtRu alloy supported on carbon black is one of the most promising materials as an anode catalyst for DMFC , because of its high tolerance against carbon monoxide poisoning. The promotion effect of Ru has been mainly discussed based on the so-called "bifunctional mechanism" [4][5][6] or "ligand effect" [37][38][39][40][41][42][43][44][45][46][47][48][49][50][51] or a mixture of both.…”

Section: Introductionmentioning

confidence: 99%

Particle growth behavior of carbon-supported Pt, Ru, PtRu catalysts prepared by an impregnation reductive-pyrolysis method for direct methanol fuel cell anodes

Kawaguchi

Sugimoto

Murakami

et al. 2005

Journal of Catalysis

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The modification of Pt(110) by ruthenium: CO adsorption and electro-oxidation

Cited by 86 publications

References 40 publications

High‐Temperature Electrochemical Characterization of Ru Core Pt Shell Fuel Cell Catalyst

High‐Temperature Electrochemical Characterization of Ru Core Pt Shell Fuel Cell Catalyst

Kinetics of CH3OH oxidation on PtRu/C studied by impedance and CO stripping voltammetry

Particle growth behavior of carbon-supported Pt, Ru, PtRu catalysts prepared by an impregnation reductive-pyrolysis method for direct methanol fuel cell anodes

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