Characterization of the electrocatalytic activity of carbon-supported platinum-based catalysts by thermal gravimetric analysis

Leontyev, Igor N.; Leontyeva, Daria V.; Kuriganova, Alexandra B.; Popov, Yurii V.; Маслова, О. А.; Glebova, N. V.; Nechitaĭlov, A. A.; Zelenina, N. K.; Tomasov, A. A.; Hennet, Louis; Smirnova, N. V.

doi:10.1016/j.mencom.2015.11.024

Cited by 27 publications

(9 citation statements)

References 9 publications

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“…In the black pigment of sample A we recognize typical carbon-related features. In our case, the sp 3 (D band) is slightly stronger than in carbon black 35 , suggesting a higher density of defects 29,36 . The green pigment of sample A exhibits very intense bands at 1352, 1465, and 1539 cm −1 which we assign to copper phthalocyanine 37,38 .…”

Section: Resultscontrasting

confidence: 43%

An Archaeometric Characterization of Ecuadorian Pottery

Polo

Briceño

Jamett

et al. 2019

Sci Rep

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Ecuadorian pottery is renowned for its beauty and the particularly rich colour of its pigments. However, a major challenge for art historians is the proper assessment of the provenance of individual pieces due to their lack of archaeological context. Of particular interest is the Jama-Coaque culture, which produced fascinating anthropomorphic and zoomorphic pottery from ca. 240 B.C. until the Spanish Conquest of 1532 A.D. in the coastal region of Ecuador. Using a combination of microscopic and spectroscopic techniques, i.e., transmission electron microscopy (TEM), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), energy-dispersive x-ray spectroscopy (EDX), and scanning electron microscopy (SEM); we are able to characterize these pieces. We have found several kinds of iron-oxide based nanostructures in all the colour pigments we investigated for the Jama-Coaque culture, suggesting the same unique volcanic source material was used for their clay. Such nanostructures were absent from the pigment samples studied from other contemporary coastal-Ecuadorian cultures, i.e., the Tumaco-La Tolita and Bahía cultures. In the yellow pigments of goethite we find carbon nanofibres, indicating these pigments were subjected to a thermal treatment. Finally, in the blue, green, and black pigments we detect modern pigments (phthalocyanine blue, lithopone, and titanium white), suggesting modern restoration. Our results demonstrate the power of TEM, Raman, FTIR, EDX, and SEM archaeometric techniques for characterizing pieces without a clear archaeological context. Furthermore, the characterization of nanostructures present in such pieces could be used as a possible fingerprint for a provenance study.

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Section: Resultscontrasting

confidence: 43%

An Archaeometric Characterization of Ecuadorian Pottery

Polo

Briceño

Jamett

et al. 2019

Sci Rep

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“…The thermograms of high-temperature oxidation of PtCu/C materials ( Figure 5) have the form characteristic of platinum-carbon catalysts [46,47]. In this case, the most rapid oxidation of the carbon carrier is observed for the initial Pt 31 Cu 69 /C (A4) sample and the Pt 57 Cu 43 /C (A4-1N) material subjected to treatment in 1 M nitric acid.…”

Section: Electroreduction Of Oxygen On Alloyed and De-alloyed Platinumentioning

confidence: 90%

Effective Platinum-Copper Catalysts for Methanol Oxidation and Oxygen Reduction in Proton-Exchange Membrane Fuel Cell

et al. 2020

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The behavior of supported alloyed and de-alloyed platinum-copper catalysts, which contained 14–27% wt. of Pt, was studied in the reactions of methanol electrooxidation (MOR) and oxygen electroreduction (ORR) in 0.1 M HClO4 solutions. Alloyed PtCux/C catalysts were prepared by a multistage sequential deposition of copper and platinum onto a Vulcan XC72 dispersed carbon support. De-alloyed PtCux−y/C catalysts were prepared by PtCux/C materials pretreatment in acid solutions. The effects of the catalysts initial composition and the acid treatment condition on their composition, structure, and catalytic activity in MOR and ORR were studied. Functional characteristics of platinum-copper catalysts were compared with those of commercial Pt/C catalysts when tested, both in an electrochemical cell and in H2/Air membrane-electrode assembly (MEA). It was shown that the acid pretreatment of platinum-copper catalysts practically does not have negative effect on their catalytic activity, but it reduces the amount of copper passing into the solution during the subsequent electrochemical study. The activity of platinum-copper catalysts in the MOR and the current-voltage characteristics of the H2/Air proton-exchange membrane fuel cell MEAs measured in the process of their life tests were much higher than those of the Pt/C catalysts.

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“…Let us note that defects are understood to be present in the graphene crystalline structure and at its edges. It is worth mentioning that the I D /I G parameter for Pt/C catalyst attains the value of 1.97, meaning thus the increasing defect concentration at the surface of the graphite layer. The G’‐band is composed of 3 peaks at 2650, 2695, and 2728 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

One‐step Simultaneous Synthesis of Graphene and Pt Nanoparticles under the Action of Pulsed Alternating Current and Electrochemical Performance of Pt/Graphene Catalysts

et al. 2017

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Pt/graphene electrocatalyst for fuel elements has been obtained via the simultaneously electrochemical dispersion of Pt foil and expanded graphite by applying the alternating current. Raman spectroscopy and transmission electron microscopy (TEM) have revealed multilayered structure of graphene (3‐5 layers) with linear defects of graphene sheets near 1 μm. The microstructural characteristics and catalytic activity of synthesized Pt/graphene catalyst have been compared with those of Pt/Vulcan catalyst prepared under the same conditions. Pt nanoparticles of Pt/Graphene catalyst exhibit smaller average dimensions and narrower particle size distribution. It follows from the electrochemical study that the electrochemical surface area of Pt/graphene catalyst is 2.5 times higher than for Pt/Vulcan. Besides this, the activity in the electrooxidation of methanol and the stability of Pt/graphene catalyst are found to be superior to the analogous parameters of Pt/Vulcan specimen.

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Characterization of the electrocatalytic activity of carbon-supported platinum-based catalysts by thermal gravimetric analysis

Cited by 27 publications

References 9 publications

An Archaeometric Characterization of Ecuadorian Pottery

An Archaeometric Characterization of Ecuadorian Pottery

Effective Platinum-Copper Catalysts for Methanol Oxidation and Oxygen Reduction in Proton-Exchange Membrane Fuel Cell

One‐step Simultaneous Synthesis of Graphene and Pt Nanoparticles under the Action of Pulsed Alternating Current and Electrochemical Performance of Pt/Graphene Catalysts

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