Adsorption of CO on Co(0001) and Pt–Co(0001) surfaces: an experimental and theoretical study

Cabeza, Gabriela F.; Légaré, P.; Castellani, Norberto J.

doi:10.1016/s0039-6028(00)00715-9

Cited by 41 publications

(43 citation statements)

References 46 publications

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“…The negative shift of the E F results in the positive shift of Pt 4f 7/2 CL as well as the d-band center. The observed values of the CL shifts for Pt 58 Co 42 and Pt 60 Ru 40 were in good agreement with those calculated from the electronic parameters of the pure elements given in the literature. [41] It must be noted that for the CO-tolerant HOR at low-potential region E < 0.1 V, the CO ad molecules are never oxidized even at the Pt-Ru alloy, indicating that the activity for the CO ad oxidation cannot be directly related to the CO-tolerant HOR activity at such a low potential.…”

Section: Effect Of Modified Electronic Structure Of Pt Skin and Pt-rusupporting

confidence: 89%

Catalysts for the electro‐oxidation of small molecules

Watanabe

Uchida

2010

Handbook of Fuel Cells

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Direct oxidation‐type fuel cells (DOFCs) have attracted great interest as a primary power source for portable electronic devices, wheelchairs, vehicles, and robots because of their simple system (no additional equipment such as a fuel reformer) and ease of maintenance. The direct methanol fuel cell (DMFC) is a typical example of DOFC. Development of highly active anode catalysts for them is one of the most important issues in achieving high‐energy conversion efficiency in DOFCs. To design such new electrocatalysts, we discuss the mechanism of methanol oxidation reaction (MOR) as well as CO oxidation reaction at several electrodes, based on in situ FTIR spectroscopy and X‐ray photoelectron spectroscopy combined with an electrochemical cell (EC‐XPS). We also show changes in the MOR activities at various Pt alloy electrodes over the wide temperature range from 20 to 120 °C, obtained by using a thin‐layer flow cell under pressurized operation. The electrooxidation of methoxy fuels is briefly discussed.

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Section: Effect Of Modified Electronic Structure Of Pt Skin and Pt-rusupporting

confidence: 89%

Catalysts for the electro‐oxidation of small molecules

Watanabe

Uchida

2010

Handbook of Fuel Cells

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“…These structures were attributed a CO coverage of 0.3 ML and 0.43 ML respectively. Our own calibration [9] gives 0.36 ML for the highest coverage we could obtain in this study. We think this is in perfect agreement with ref.…”

Section: Resultsmentioning

confidence: 66%

“…The experimental data are clearly lower up to a Pt coverage of 0.5 ML. We already showed [9] that the Pt deposits actually adsorb CO although in lower quantity than the clean Pt(111) surface. Moreover, we proved that the adsorption energy of CO on Pt was decreased by some 40 % when Pt was supported by Co(0001).…”

Section: Resultsmentioning

confidence: 90%

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CO Adsorption on Co(0001)-Supported Pt Overlayers

Légaré

Madani

Cabeza

et al. 2001

IJMS

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the growth of Pt deposits on Co(0001) was followed by STM and XPS. The chemical reactivity of the resulting surface was checked by CO adsorption. Pt grows as dendritic islands on the Co terraces whereas forming stripes at the Co step edges.Annealing the sample has no apparent effect on the STM pictures. However, XPS suggests that a limited dilution of Pt in Co takes place. The adsorption of CO on the surface is drastically affected by the presence of Pt even for minute traces. The adsorption energy on the Pt areas is decreased by 40 %. The maximum coverage on the Co areas is also decreased. This indicates that Pt impurities diluted in Co have a high passivating power as a consequence of the induced electronic changes.

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“…However, in view of the electronegativity difference between Co and Pt (1.8 and 2.2, respectively), it should be noted that the electron transfer must occur from Co to Pt. According to previous theoretical studies, when the Pt atom is alloyed with a second component, it has been demonstrated the total number of electrons per Pt atom increases while the 5d electron decreases [53,54]. Figure 3(d) presents the curve-fitted Co 2p 3/2 spectrum for PtCo/G, which could be deconvoluted into the two peaks with oxidized Co as the predominant specie.…”

Section: Resultsmentioning

confidence: 68%

PtCo alloy nanoparticles supported on graphene nanosheets with high performance for methanol oxidation

2012

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PtCo alloy nanoparticles are deposited onto graphene sheets through a facile and reproducible hydrothermal method. During the hydrothermal reaction, the reduction of graphene oxide and PtCo alloy nanoparticles loading can be achieved. X-ray diffraction (XRD) analyses reveal a good crystallinity of the supported Pt nanoparticles in the composites and the formation of PtCo alloy. X-ray photoelectron spectra (XPS) results depict that Pt mainly exists in the metallic form, while much of the cobalt is oxidized. Transmission electron microscope (TEM) observations show that the PtCo alloy nanoparticles are uniformly dispersed on graphene nanosheets compared with multiwalled carbon nanotubes (MWNTs). This PtCo-graphene composite exhibits excellent electrocatalytic activity and high poison tolerance toward poisoning species for methanol oxidation reaction, far outperforming the Pt-graphene or PtCo-MWNTs composites with the same feeding ratio of Pt/carbon. graphene, PtCo alloy nanoparticles, electrocatalyst, methanol oxidation, fuel cells Citation:Huang H J, Sun D P, Wang X. PtCo alloy nanoparticles supported on graphene nanosheets with high performance for methanol oxidation.

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Adsorption of CO on Co(0001) and Pt–Co(0001) surfaces: an experimental and theoretical study

Cited by 41 publications

References 46 publications

Catalysts for the electro‐oxidation of small molecules

Catalysts for the electro‐oxidation of small molecules

CO Adsorption on Co(0001)-Supported Pt Overlayers

PtCo alloy nanoparticles supported on graphene nanosheets with high performance for methanol oxidation

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