The ethanol electrooxidation at Pt layers deposited on polycrystalline Au

Prieto, Maurício J.; Rodrigues-Filho, Ubirajara P.; Landers, Richard; Tremiliosi‐Filho, Germano

doi:10.1039/c1cp22390a

Cited by 14 publications

(15 citation statements)

References 42 publications

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“…The Pt peak position at −72.6 eV further suggests that the Pt monolayer exhibits Pt 2+ states . This finding is confirmed by the Pt 4d 5/2 level at −316.4 eV (inset in Figure a) . The weaker signal of Pt 4f in the XPS data indicates that the thickness of the Pt overlayer on Au-NI/Si is around 1 nm.…”

Section: Results and Discussionmentioning

confidence: 56%

Selective Deposition of an Ultrathin Pt Layer on a Au-Nanoisland-Modified Si Photocathode for Hydrogen Generation

et al. 2017

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Platinum, being the most efficient and stable catalyst, is used in photoelectrochemical (PEC) devices. However, a minimal amount of Pt with maximum catalytic activity is required to be used to minimize the cost of production. In this work, we use an environmentally friendly, cost-effective, and less Pt-consuming method to prepare PEC devices for the hydrogen evolution reaction (HER). The Pt monolayer catalyst is selectively deposited on a Au-nanoisland-supported boron-doped p-type Si (100) photocathode. The PEC device based on the Si photocathode with an ultralow loading of the Pt catalyst exhibits a comparable performance for the HER to that of devices with a thick Pt layer. In addition, we demonstrate that by using a thin TiO 2 layer deposited by atomic layer deposition photo-oxidation of the Si photocathode can be blocked resulting in a stable PEC performance.

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Section: Results and Discussionmentioning

confidence: 56%

Selective Deposition of an Ultrathin Pt Layer on a Au-Nanoisland-Modified Si Photocathode for Hydrogen Generation

et al. 2017

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“…For instance, Pt@Au core-shell nanoparticles and Pt layers on polycrystalline Au have been tested by several groups for catalytic reactions. [29][30][31][32][33] In this system, as well as in the case of the Pt/Au(hkl) model surfaces studied in this paper, redistribution of the catalytically active components may occur as a consequence of the adsorption of intermediate species (such as, but not limited to, CO), thus inducing variations (gain or loss) in the activity of the catalyst material depending on the reaction paths followed and the affinities between the reaction intermediates and each component of the catalyst.…”

Section: Resultsmentioning

confidence: 99%

Surface restructuring of Pt films on Au stepped surfaces: effects on catalytic behaviour

Prieto

Tremiliosi‐Filho

2013

Phys. Chem. Chem. Phys.

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In this paper, the reconstruction of Pt films deposited on stepped Au(hkl) surfaces belonging to the [n(111) × (110)] family of planes has been studied. Pt films were deposited using the galvanic displacement procedure of a pre-deposited Cu monolayer. We experimentally found that the Pt film deposition onto Au(hkl) surfaces is not fully epitaxial suggesting an atomic arrangement different from the underlying substrate. Additionally, we found that even though voltammetric profiles are not much different from those reported in the literature for Pt single crystals having the same crystallographic orientation, there is a reconstruction of the Pt layers on all Pt/Au(hkl) surfaces upon CO adsorption/oxidation as indicated by comparing the active areas of the Pt films before and after stripping. Additional FTIR in situ experiments on ethanol oxidation confirm that film reconstruction affects the reaction by product yield modification.

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“…Thus, the Faraday efficiency for the EOR C1 pathway on Pd-based and Pt-based catalysts is generally quite low (normally only 1–7.5% for Pt or ca. 2.5% for Pd) − at room temperature, even if a ca. 24% Faraday efficiency was obtained on Pd–Ni(OH) 2 /GO in alkaline media by Huang et al, and a much stronger capability for the C–C cleavage was observed on a non-alloyed Pt 46 –(SnO 2 ) 54 core–shell particle .…”

Section: Introductionmentioning

confidence: 99%

Potential-Dependent Selectivity of Ethanol Complete Oxidation on Rh Electrode in Alkaline Media: A Synergistic Study of Electrochemical ATR-SEIRAS and IRAS

et al. 2019

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Rh-based catalysts might resolve the longstanding problem of poor C1 pathway efficiency toward an ethanol oxidation reaction (EOR). To facilitate the rational design and preparation of Rh-based EOR catalysts, here we fundamentally study ethanol adsorptive dissociation and oxidation on an Rh electrode surface by electrochemical infrared absorption spectroscopy. First, real-time infrared spectral results show that ethanol could be easily split on an Rh surface into CO ad and CH x intermediates only in alkaline media but not in acidic media. Second, the onset oxidation potential of EOR on Rh is ca. 180 mV more negative than that on Pd and Pt electrode in alkaline media. The EOR J f /J b ratio is ca. 5.73, 1.62, and 0.35 on Rh, Pt, and Pd, respectively, suggesting that CO ad and/or CH x intermediates could be readily oxidized into CO 2 on Rh. Accordingly, the apparent selectivity efficiency of the C1 pathway (η) is estimated to be 100% when the potential is at 0.4−0.6 V vs RHE, subsequently η sharply decreases to zero at 0.65−0.8 V vs RHE, and then, η gradually rebounds to ca. 15% when the potential moves positively. This work may provide some theoretical support for fabricating highly efficient EOR catalysts.

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The ethanol electrooxidation at Pt layers deposited on polycrystalline Au

Cited by 14 publications

References 42 publications

Selective Deposition of an Ultrathin Pt Layer on a Au-Nanoisland-Modified Si Photocathode for Hydrogen Generation

Selective Deposition of an Ultrathin Pt Layer on a Au-Nanoisland-Modified Si Photocathode for Hydrogen Generation

Surface restructuring of Pt films on Au stepped surfaces: effects on catalytic behaviour

Potential-Dependent Selectivity of Ethanol Complete Oxidation on Rh Electrode in Alkaline Media: A Synergistic Study of Electrochemical ATR-SEIRAS and IRAS

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