Synergetic effect of palladium–ruthenium nanostructures for ethanol electrooxidation in alkaline media

Monyoncho, Evans A.; Ntais, Spyridon; Soares, Felipo Doval Rojas; Woo, Tom K.; Baranova, Elena A.

doi:10.1016/j.jpowsour.2015.03.186

Cited by 68 publications

(31 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5, the results from cyclic voltammetry experiments in 1 mol L −1 KOH in the potential range of − 0.85 to 0.1 V vs Hg/HgO are shown. The shape of the CVs of palladium catalysts supported on both materials is similar and in agreement with the results from the literature [52,60,61]. The region associated with palladium oxide formation in the forward scan from − 0.20 to 0.1 V, and the palladium oxide reduction at around − 0.2 V in the backward scan, was observed [52,62].…”

Section: Resultssupporting

confidence: 90%

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

View full text Add to dashboard Cite

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.

show abstract

Section: Resultssupporting

confidence: 90%

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

View full text Add to dashboard Cite

show abstract

“…The physical, structural, and chemical characterizations of Pd/C are shown in Figure S1 in the Supporting Information; other details have been published elsewhere. 49 In summary, the supported particle size was determined to be, on average, 4 ± 2 nm. The XRD pattern showed that the nanoparticles retained the face-centered-cubic (fcc) structure of bulk Pd with peaks at 40°, 46°, and 68°2θ, corresponding to (111), (200), and (220) reflections, respectively.…”

Section: Resultsmentioning

confidence: 94%

Ethanol Electro-oxidation on Palladium Revisited Using Polarization Modulation Infrared Reflection Absorption Spectroscopy (PM-IRRAS) and Density Functional Theory (DFT): Why Is It Difficult To Break the C–C Bond?

et al. 2016

Self Cite

View full text Add to dashboard Cite

International audienceInsights into the ethanol electro-oxidation reaction mechanism on palladium in alkaline media are presented combining polarization modulation infrared reflec- tion absorption spectroscopy (PM-IRRAS) and density functional theory (DFT) calculations. The synergy between PM-IRRAS and DFT calculations helps to explain why the C− C bond is not broken during ethanol electro-oxidation, and the reaction stops at acetate. Coupling chronoamperometry (CA) with in situ PM-IRRAS enables us to simultaneously identify ethanol electro-oxidation products on the catalyst surface and in the bulk solution. We show that, at lower potential, it is possible to break the C−C bond on Pd/C in alkaline media to form CO2. However, the selectivity is poor, because of competition with the formation of acetate and other side products, which gets worse at higher potentials. DFT computations complete the picture using the computational hydrogen electrode approach. The computations highlight the pivotal role of the CH3CO intermediate that can either undergo a C−C bond scission yielding CO and then CO2 or that can be oxidized toward CH3COO−. The latter is a dead end in the reaction scheme toward CO2 production, since it cannot be easily oxidized nor broken into C1 fragments. However, CH3CO is not the most favored intermediate formed from ethanol electro-oxidation on Pd, hence limiting the production of CO2

show abstract

“…Monyoncho et al [49] prepared carbon-supported Pd–Ru NPs using a polyol method as an anodic catalyst for ethanol oxidation reaction (EOR). Metal precursor salts (PdCl 2 and RuCl 3 ) were dissolved in ethylene glycol (EG).…”

Section: Physical Mixture Of Pd and Ru Npsmentioning

confidence: 99%

Recent progress in the structure control of Pd–Ru bimetallic nanomaterials

Kusada

Kitagawa

2016

Science and Technology of Advanced Materials

View full text Add to dashboard Cite

Pd and Ru are two key elements of the platinum-group metals that are invaluable to areas such as catalysis and energy storage/transfer. To maximize the potential of the Pd and Ru elements, significant effort has been devoted to synthesizing Pd–Ru bimetallic materials. However, most of the reports dealing with this subject describe phase-separated structures such as near-surface alloys and physical mixtures of monometallic nanoparticles (NPs). Pd–Ru alloys with homogenous structure and arbitrary metallic ratio are highly desired for basic scientific research and commercial material design. In the past several years, with the development of nanoscience, Pd–Ru bimetallic alloys with different architectures including heterostructure, core-shell structure and solid-solution alloy were successfully synthesized. In particular, we have now reached the stage of being able to obtain Pd–Ru solid-solution alloy NPs over the whole composition range. These Pd–Ru bimetallic alloys are better catalysts than their parent metal NPs in many catalytic reactions, because the electronic structures of Pd and Ru are modified by alloying. In this review, we describe the recent development in the structure control of Pd–Ru bimetallic nanomaterials. Aiming for a better understanding of the synthesis strategies, some fundamental details including fabrication methods and formation mechanisms are discussed. We stress that the modification of electronic structure, originating from different nanoscale geometry and chemical composition, profoundly affects material properties. Finally, we discuss open issues in this field.

show abstract

Synergetic effect of palladium–ruthenium nanostructures for ethanol electrooxidation in alkaline media

Cited by 68 publications

References 41 publications

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

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

Ethanol Electro-oxidation on Palladium Revisited Using Polarization Modulation Infrared Reflection Absorption Spectroscopy (PM-IRRAS) and Density Functional Theory (DFT): Why Is It Difficult To Break the C–C Bond?

Recent progress in the structure control of Pd–Ru bimetallic nanomaterials

Contact Info

Product

Resources

About