Ethanol Oxidation Reaction on IrPtSn/C Electrocatalysts with low Pt Content

Silva, Júlio César M.; Anea, Beatriz; Souza, R. F. B. de; Assumpção, M.H.M.T.; Calegaro, Marcelo L.; Neto, Almir Oliveira; Santos, Mauro C.

doi:10.5935/0103-5053.20130196

Cited by 9 publications

(10 citation statements)

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“…The observed shift indicates a lattice constriction due to the incorporation of smaller Rh atoms into the Pt fcc structure, suggesting the alloy formation of Pt-Rh. In order to confirm the alloy formation, the 220 crystal planes were deconvoluted and the lattice parameters were calculated for all synthetized materials, as already reported on the literature [29,30].…”

Section: Resultsmentioning

confidence: 99%

Oxidation of ammonia using PtRh/C electrocatalysts: Fuel cell and electrochemical evaluation

Assumpção

Piasentin

Hammer

et al. 2015

Applied Catalysis B: Environmental

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Júlio César Martins Silva)Highlights Direct ammonia fuel cell (DAFC) performance using PtRh/C electrocatalysts as anode.Ammonia oxidation evaluation by electrochemical experiments. An optimization study of the NH 4 OH and KOH concentrations used as fuel in a DAFC.Using PtRh/C 90:10 were obtained the highest power density and open circuit voltage.Using 3 mol L -1 KOH and 3 mol L -1 NH 4 OH the best result in a DAFC was obtained. AbstractThis study reports on the use of PtRh/C electrocatalysts prepared by the borohydride reduction method with different Pt:Rh atomic ratios: (90:10, 70:30 and 50:50) which was investigated toward the ammonia electro-oxidation considering electrochemical and also direct ammonia fuel cell (DAFC) experiments. The DAFC experiments were conducted using different proportions of NH 4 OH and KOH as fuels.X-ray diffraction showed the formation of PtRh alloy while transmission electron micrographs showed the particles sizes between 4.1 and 4.5 nm. Among the different NH 4 OH and KOH concentrations the combination of 3 mol L -1 NH 4 OH and 3 mol L -1 KOH was the most favorable due to the higher KOH concentration, which increased the electrolyte conductivity, thus improving the ammonia oxidation. Moreover, among the PtRh/C electrocatalysts the Pt:Rh ratio of 90:10 showed to be the best suited one since it showed a power density almost 60 % higher than Pt. X-ray photoelectron spectroscopy results revealed for this catalyst that the nanoparticles contain a high proportion of metallic Pt and Rh phases, supporting the alloy formation between Pt and Rh. The improved fuel cell efficiency can be related to the combination of different effects: the alloy formation between Pt and Rh (electronic effect), suppressing the adsorption strength of poisonous intermediates, and a synergic effect between Pt and Rh at this composition.

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Section: Resultsmentioning

confidence: 99%

Oxidation of ammonia using PtRh/C electrocatalysts: Fuel cell and electrochemical evaluation

Assumpção

Piasentin

Hammer

et al. 2015

Applied Catalysis B: Environmental

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“…Furthermore, it was seen peaks related to the palladium face centered cubic (fcc) structure at around 2θ = 39°, 46°, 67° and 81°, corresponding to (111), (200), (220) and (311) planes, respectively [42,43]. The mean crystallite size estimated using Scherrer equation and (220) peak [4,44] was 5.6 nm for Pd/C and 5.3 nm for Pd/ BC, which is in agreement with the palladium nanoparticles synthesized using sodium borohydrate process [45,46].…”

Section: Methodsmentioning

confidence: 99%

“…The search for new energy sources based on the concept of clean and renewable energy has been intensified in the recently years [1][2][3]. Fuel cells are pointed out as a promising technology for clean energy generation and its concept is based on the conversion of chemical energy into electricity [4][5][6]. Liquid fuels cells (LFC) are considerably more convenient in terms of easy handling than gaseous hydrogen [7], and low temperature fuel cells based on ion exchange membrane can be fed with different fuels, such as methanol, ethanol, formic acid, etc., [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Palladium nanoparticles supported on mesoporous biocarbon from coconut shell for ethanol electro-oxidation in alkaline media

Ferreira

Cavallari

Bergamaschi

et al. 2018

Mater Renew Sustain Energy

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Palladium nanoparticles supported on carbon Vulcan XC72 (Pd/C) and biocarbon (Pd/BC) synthesized by sodium borohydride process were used as catalysts for ethanol electro-oxidation in alkaline media. The biocarbon (BC) from coconut shell with mesoporous and high surface area (792 m 2 g −1) was obtained by carbonization at 900 °C and the hydrothermal treatment in a microwave oven. The D-band and G-band intensity ratio (I D /I G) from Raman analysis showed high disorder of the biocarbon, while X-ray photoelectron spectroscopy (XPS) suggests higher percentage of oxygen groups on the surface of biocarbon than of Vulcan XC72. From X-ray diffraction (XRD), it was observed peaks in 2θ degree related to the face centered cubic (fcc) structure of palladium and the mean crystallite sizes calculated based on the diffraction peak of Pd (220) were 5.6 nm for Pd/C and 5.3 nm for Pd/BC. Using Transmission Electron Microscope (TEM), it was observed particles well dispersed on both carbons support materials. The electrocatalytic activity of the materials was investigated by cyclic voltammetry (CV) and chronoamperometry (CA) experiments. The peak current density (on CV experiments) from ethanol electro-oxidation on Pd/BC was 50% higher than on Pd/C, while the current density measured at 15 min of CA experiments was 80% higher on Pd/BC than on Pd/C. The higher catalytic activity of Pd/BC might be related to the large surface area of the biocarbon (792 m 2 g −1) vs (239 m 2 g −1) of Vulcan carbon, the defects of the biocarbon structure and higher amount of oxygen on the surface than Carbon Vulcan XC 72.

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“…The peaks at around 40, 46, 67, 81 2q are attributed to the (111), (200), (220) and (311) face centered cubic (fcc) reflections typical for bulk and nanostructured Pt [4,18]. The diffraction peaks in the PtRu catalysts are shifted to higher 2q values with respect to the same reflections in Pt/C (Table 1), suggesting the platinum ruthenium alloy formation [27,28], however because the main (111) and (200) Pt reflections overlap with graphite reflection (101) at 45 2q in carbon Vulcan XC-72, the crystallite size analysis was done using (220) reflection and Scherrer equation [17,29]. Table 1 shows that the crystallite sizes of Pt 70 Ru 30 /C and Pt 50 Ru 50 /C were lower than that of Pt/C and Pt 90 Ru 10 /C materials.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of carbon supported platinum–ruthenium nanoparticles for ammonia electro-oxidation: Combined fuel cell and electrochemical approach

Silva¹,

Ntais²,

Teixeira‐Neto³

et al. 2017

International Journal of Hydrogen Energy

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Ethanol Oxidation Reaction on IrPtSn/C Electrocatalysts with low Pt Content

Cited by 9 publications

References 0 publications

Oxidation of ammonia using PtRh/C electrocatalysts: Fuel cell and electrochemical evaluation

Oxidation of ammonia using PtRh/C electrocatalysts: Fuel cell and electrochemical evaluation

Palladium nanoparticles supported on mesoporous biocarbon from coconut shell for ethanol electro-oxidation in alkaline media

Evaluation of carbon supported platinum–ruthenium nanoparticles for ammonia electro-oxidation: Combined fuel cell and electrochemical approach

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