Metal crystallinity effects in electrocatalysis as probed by real-time FTIR spectroscopy:  electrooxidation of formic acid, methanol, and ethanol on ordered low-index platinum surfaces

Chang, Si Chung; Leung, Lam Wing H.; Weaver, Michael J.

doi:10.1021/j100378a072

Cited by 261 publications

(196 citation statements)

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“…According to literature [18,[36][37][38][39][40][41][42][43][44], Sn favors the low potential oxidation of CO and CO-like intermediates formed during the chemical adsorption of methanol and ethanol. Therefore, tin improves the electro-oxidation of methanol and ethanol at lower potentials and increases the reaction rate.…”

Section: Resultsmentioning

confidence: 99%

Performance comparison of low-temperature direct alcohol fuel cells with different anode catalysts

Zhou

Zhou²,

et al. 2004

Journal of Power Sources

281

196

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Section: Resultsmentioning

confidence: 99%

Performance comparison of low-temperature direct alcohol fuel cells with different anode catalysts

Zhou

Zhou²,

et al. 2004

Journal of Power Sources

281

196

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“…As we have known, a catalyst is a very important part of fuel cells, and platinum is the most common anode catalyst for formic acid (FA) oxidation. However, Pt is prone to poisoning by CO-like intermediates, leading to a significant decrease of catalytic performance [10][11][12]. It is due to the fact that the indirect pathway by dehydration is predominant in the oxidation reaction of FA on pure Pt, but not by the dehydrogenation pathway [13].…”

Section: Introductionmentioning

confidence: 99%

Au as an efficient promoter for electrocatalytic oxidation of formic acid and carbon monoxide: a comparison between Pt-on-Au and PtAu alloy catalysts

et al. 2013

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The absence of unpaired d-electrons of gold leads to its lack of reactivity and paucity of catalytic activity. Synergistic activity of bimetallic PtAu has been proved, and its structure greatly influences on the electrocatalytic activity toward formic acid and carbon monoxide oxidation. Here, a comparison between Pt-modified Au (designated as Pt-on-Au) and PtAu alloy catalysts has been studied. The Pt-on-Au catalyst was prepared by electrodeposition of Pt on the pre-prepared Au, while PtAu alloy was obtained by co-electrodeposition. As a whole, both types of PtAu catalysts were found to be more active toward formic acid electrooxidation compared to pure Pt, exhibiting maximum activity on Pt-on-Au catalyst with Pt to Au atomic ratio of 1:10.22. Moreover, the Pt/Au atomic ratio directly relates to the oxidation pathway of formic acid and carbon monoxide oxidation. The results may be ascribed to much less CO ads on the surface than single Pt catalyst due to the effect of Au nanoparticles. CO stripping voltammograms present the obvious variation between Pt-on-Au and PtAu alloy catalysts. Meanwhile, the electrocatalytic activities of bimetallic PtAu are evaluated by electrochemical impedance spectroscopy and Tafel analysis.

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“…Thus, earlier investigations of product formation during ethanol electro-oxidation in both acidic and alkaline media could be used to analyze the differences in nonlinear behavior. It has been previously shown [5,11,21,30] that surface structure has a significant role on the activity rate of ethanol oxidation and product distribution. The main EtOR products detected on Pt(111) in acidic media were acetic acid and acetaldehyde.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Potential oscillations during electro-oxidation of ethanol on platinum in alkaline media: The role of surface sites

Sallum

González²,

Feliu

2016

Electrochemistry Communications

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Potential oscillations during electro-oxidation of ethanol on platinum in alkaline media: The role of surface sites, Electrochemistry Communications (2016Communications ( ), doi: 10.1016Communications ( /j.elecom.2016 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT AbstractThe electro-oxidation of small organic molecules is one of the major areas of interest in electrocatalysis due to its potential use in energy conversion. Instabilities in alkaline solution, particularly in comparison with kinetic properties in a conventional regime, are rarely reported in the literature, despite the fact that the catalytic activity is higher in this medium and the onset potential is shifted to lower values compared to acidic media.Ethanol oxidation on polycrystalline platinum exhibits oscillations under galvanostatic control. As the reaction is structure-sensitive, it is possible to study the contribution of the three platinum basal planes to the complex kinetics. We found that Pt(100) has the major influence in the overall non-linear kinetics of ethanol electro-oxidation on Pt(poly), possibly because it has the highest formation and accumulation rate of CO ads . Based on the differences observed in the galvanostatic transients on Pt(poly), Pt(110) and Pt(100), and the absence of this behaviour on Pt(111), it is possible to infer that surface sites strongly influence the kinetic scenario during the ethanol oxidation reaction.

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Metal crystallinity effects in electrocatalysis as probed by real-time FTIR spectroscopy: electrooxidation of formic acid, methanol, and ethanol on ordered low-index platinum surfaces

Cited by 261 publications

References 1 publication

Performance comparison of low-temperature direct alcohol fuel cells with different anode catalysts

Performance comparison of low-temperature direct alcohol fuel cells with different anode catalysts

Au as an efficient promoter for electrocatalytic oxidation of formic acid and carbon monoxide: a comparison between Pt-on-Au and PtAu alloy catalysts

Potential oscillations during electro-oxidation of ethanol on platinum in alkaline media: The role of surface sites

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