Preparation, structural characterization and activity for ethanol oxidation of carbon supported ternary Pt–Sn–Rh catalysts

Colmati, Flávio; Antolini, Ermete; González, Ernesto Rafael

doi:10.1016/j.jallcom.2007.02.015

Cited by 87 publications

(43 citation statements)

References 42 publications

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“…[10]. However, the ethanol oxidation rate achieved with Pt-Rh catalysts [15] rate is lower than that of Pt-Sn [10].…”

Section: Introductionmentioning

confidence: 87%

“…Pt-Sn catalysts are generally considered the best anodes for ethanol oxidation, working at lower potentials than pure platinum [8][9][10]. Pt is the most active metal for alcohol oxidation in acid medium, and Sn provides surface oxygen species for the oxidation of CO and carbonyl species adsorbed on Pt, which are produced during the dissociative adsorption of ethanol on Pt active sites at low potentials [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Platinum–rhodium–tin/carbon electrocatalysts for ethanol oxidation in acid media: effect of the precursor addition order and the amount of tin

et al. 2015

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Carbon-supported Ptx-Rhy-Snz catalysts (x:y:z = 3:1:4, 6:2:4, 9:3:4) are prepared by Pt, Rh and Sn precursors reduction in different addition order. The materials are characterized by X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy techniques and are evaluated for the electrooxidation of ethanol in acidic media by cyclic voltammetry, chronoamperometry and anode potentiostatic polarization.. Oxidized Rh species prevail on the surface of catalysts synthetized by simultaneous co-precipitation, thus demonstrating the influence of synthesis method on the oxidation state of catalysts. Furthermore, high amounts of Sn in composites synthetized by co-precipitation results in very active catalysts at low potentials (bifunctional effect) while medium Sn load is needed for sequentially deposited catalysts when the electronic effect is most important (high potentials), since more exposed Pt and Rh sites are needed on the catalyst surface to alcohol oxidation. The Pt3-Rh1-Sn4/C catalyst prepared by coprecipitation is the most active at potentials lower than 0.55 V (related to bifunctional effect) while the Pt6-Rh2-Sn4/C catalyst, prepared by sequential precipitation (first Rh and, after drying, Pt+Sn), is the most active above 0.55 V.

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“…[10]. However, the ethanol oxidation rate achieved with Pt-Rh catalysts [15] rate is lower than that of Pt-Sn [10].…”

Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Platinum–rhodium–tin/carbon electrocatalysts for ethanol oxidation in acid media: effect of the precursor addition order and the amount of tin

et al. 2015

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“…Preliminary in-situ FTIR studies have shown the addition of Rh to Pt reduces the amount of acetaldehyde produced apparently promoting C-C bond scission [130,131]. Very recently, a ternary Pt-Sn-Rh electrocatalyst has been shown to exhibit higher activity for ethanol electro-oxidation than binary Pt-Sn [132].…”

Section: Future Outlookmentioning

confidence: 99%

Nanostructured electrocatalyst for fuel cells : silica templated synthesis of Pt/C composites.

Stechel¹,

Switzer²,

Fujimoto³

et al. 2007

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Platinum-based electrocatalysts are currently required for state-of-the-art fuel cells and represent a significant portion of the overall fuel cell cost. If fuel cell technology is to become competitive with other energy conversion technologies, improve the utilization of precious metal catalysts is essential. A primary focus of this work is on creating enhanced nanostructured materials which improve precious-metal utilization. The goal is to engineer superior electrocatalytic materials through the synthesis, development and investigation of novel templated open frame structures synthesized in an aerosol-based approach.Bulk templating methods for both Pt/C and Pt-Ru composites are evaluated in this study and are found to be limited due to the fact that the nanostructure is not maintained throughout the entire sample. Therefore, an accurate examination of structural effects was previously impossible. An aerosol-based templating method of synthesizing nanostructured Pt-Ru electrocatalysts has been developed wherein the effects of structure can be related to electrocatalytic performance. The aerosol-based templating method developed in this work is extremely versatile as it can be conveniently modified to synthesize alternative materials for other systems. The synthesis method was able to be extended to nanostructured Pt-Sn for ethanol oxidation in alkaline media. Nanostructured Pt-Sn electrocatalysts were evaluated in a unique approach tailored to electrocatalytic studies in alkaline media. At low temperatures, nanostructured Pt-Sn electrocatalysts were found to have significantly higher ethanol oxidation activity than a comparable nanostructured Pt catalyst. At higher temperatures, the oxygen-containing species contribution likely provided by Sn is insignificant due to a more oxidized Pt surface. The importance of the surface coverage of oxygen-containing species in the reaction mechanism is established in these studies. The investigations in this work present original studies of anion exchange ionomers as entrapment materials for rotating disc electrode (RDE) studies in alkaline media. Their significance is linked to the development of membrane electrode assemblies (MEAs) with the same ionomer for a KOH-free alkaline fuel cell (AFC). 4 5

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“…The enhanced activity of the ternary catalyst is due to the promoting effect of the second or third elements added to Pt. Among the number of ternary compositions tested, Pt-Sn-M (M = Ni, Ir and Rh) has been repeatedly reported to enhance the catalytic activity for EOR in direct ethanol fuel cells (DEFCs) [19]. PtSn-M has also been used in the microfluidic membraneless fuel cell system to improve the catalytic activity of EOR.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Nanometals (Ni and Sn) in Platinum-Based Ternary Electrocatalysts for Ethanol Electro-oxidation in Membraneless Fuel Cells

Ponmani

Kiruthika

Muthukumaran

2015

Journal of Electrochemical Science and Technology

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In the present work, Carbon supported Pt 100 , Pt 80 Sn 20 , Pt 80 Ni 20 and Pt 80 Sn 10 Ni 10 electrocatalysts with different atomic ratios were prepared by ethylene glycol-reduction method to study the electro-oxidation of ethanol in membraneless fuel cell. The electrocatalysts were characterized in terms of structure, morphology and composition by using XRD, TEM and EDX techniques. Transmission electron microscopy measurements revealed a decrease in the mean particle size of the catalysts for the ternary compositions.

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Preparation, structural characterization and activity for ethanol oxidation of carbon supported ternary Pt–Sn–Rh catalysts

Cited by 87 publications

References 42 publications

Platinum–rhodium–tin/carbon electrocatalysts for ethanol oxidation in acid media: effect of the precursor addition order and the amount of tin

Platinum–rhodium–tin/carbon electrocatalysts for ethanol oxidation in acid media: effect of the precursor addition order and the amount of tin

Nanostructured electrocatalyst for fuel cells : silica templated synthesis of Pt/C composites.

Investigation of Nanometals (Ni and Sn) in Platinum-Based Ternary Electrocatalysts for Ethanol Electro-oxidation in Membraneless Fuel Cells

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