Enhanced stability and activity of PtRu nanotubes for methanol electrooxidation

Garbarino, Sébastien; Ponrouch, Alexandre; Pronovost, S.; Guay, Daniel

doi:10.1016/j.elecom.2009.05.028

Cited by 30 publications

(14 citation statements)

References 19 publications

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“… Effect of E dep : In this series of measurements, an AAO membrane was held firmly in front of the Ti substrate. As shown elsewhere,23, 29, 30, 31 this led to the formation of an array of Pt nanowires on the surface of the substrate. All deposition parameters were kept constant (1 mM of Na 2 PtCl 6 ; 100 mM KCl; 10 mM HCl; T dep = 50 °C), except for the deposition potential, E dep , that was varied from ‐0.15, ‐0.35 and ‐0.45V for samples NW5, NW2 and NW4, respectively.…”

Section: Resultsmentioning

confidence: 54%

Highly Porous and Preferentially Oriented {100} Platinum Nanowires and Thin Films

Ponrouch

Garbarino

Bertin

et al. 2012

Adv Funct Materials

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Highly {100} oriented Pt deposits were prepared by electrodeposition from a 10 mM HCl, 100 mM KCl and Na 2 PtCl 6 .xH 2 O electrolyte. The deposits were prepared in the form of thin fi lms and array of nanowires. A qualitative assessment of the proportion of {100} oriented Pt surfaces was obtained through X-ray diffraction measurements and cyclic voltammetry in 0.5 M H 2 SO 4 . The effect of the deposition potential, E dep , temperature of the electrolyte, T dep , platinum salt concentration [Na 2 PtCl 6 .xH 2 O], and nature of the substrate were investigated. It was shown that the proportion of {100} oriented Pt surfaces reaches a maximum for E dep = −0.35 V vs SCE. Moreover, this proportion increases steadily as T dep and [Na 2 PtCl 6 .xH 2 O] are decreased from 75 to 25 ° C and from 2.5 to 0.25 mM, respectively. Scanning electron microscopy and high-resolution transmission electron microscopy micrographs indicate that the more oriented samples are made of pine tree-like structures that are effectively single crystals, and that the growth facets appear to be close to the {001} plane. This observation also clearly indicates that the plane exposed during the CV experiment is also {001}. As suggested by these micrographs, the fi lms and nanowires are highly porous and roughness factors as large as 1000 were obtained on highly {100} oriented Pt nanowires. The predominance of {100} facets is attributed to their energetically favoured growth in the presence of hydrogen, and is shown to be signifi cantly enhanced when the mass transport of Pt 4 + is limited. Due to the predominance of {100} facets, the normalized electrocatalytic activity ( μ A cm − 2 Pt ) for the electro-oxidation of hydrazine and ammonia is higher than non-oriented polycrystalline Pt by a factor of 4 and 2.7, respectively.

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Section: Resultsmentioning

confidence: 54%

Highly Porous and Preferentially Oriented {100} Platinum Nanowires and Thin Films

Ponrouch

Garbarino

Bertin

et al. 2012

Adv Funct Materials

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“…At present, to design and fabricate highly active Pt-based alloy electrocatalysts has been an important strategy by means of engineering the alloy composition, structure size, and morphology etc [6]. For instance, a variety of Pt alloy nanomaterials has been developed to enhance its MOR activity considering the alloy effect, such as PtCu nanoparticles [7], PtRu nanotubes [8], supported PtRu nanoparticles [9e11], PtAu [12] and PtPd [13] nanoparticles and so on. Recently, non-precious 3d transition metals (referring to the unfilled subshell electrons in the 3d-orbital), such as Fe, Co, and Ni, were found to have great synergistic catalytic effect on the MOR activity of Pt [13e16] besides their remarkably synergistic role on oxygen reduction reaction (ORR) [5].…”

Section: Introductionmentioning

confidence: 99%

Nanoporous PtCo and PtNi alloy ribbons for methanol electrooxidation

Hou

Pang

et al. 2012

International Journal of Hydrogen Energy

125

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“…PtCu alloy nanotube arrays were also fabricated by similar galvanostatic method and exhibited good stability and catalytic activity for ethanol oxidation in acidic medium [34]. Through electro-codeposition of Pt and Ru into a porous AAO membrane, PtRu nanotubes formed on Ti substrates were reported by Garbarino et al [35]. All deposits were performed in a potentiostatic mode at -0.05 V (vs. RHE) and with a constant deposition charge density of 40 C cm -2 .…”

Section: Electrodepositionmentioning

confidence: 99%

An Overview of One-Dimensional Metal Nanostructures for Electrocatalysis

Kim

Noh

et al. 2015

Catal Surv Asia

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Nanostructures of metals are of great importance in the area of catalysis due to their distinct physicochemical properties compared to their bulk counterparts. Size and morphology dependent properties of metal nanostructures provide a rational approach toward designing a highly efficient catalytic materials. In particular, onedimensional (1D) metallic nanostructures in the shapes of wires, rods and tubes have recently been studied with great interest due to their potential uses as electrocatalysts for oxidations of fuels and reduction of oxidants in fuel cell applications. Compared to the conventional nanoparticle catalysts that are generally supported on carbon, these 1D materials can offer significant opportunities to improve catalytic performance under fuel cell reaction conditions by their structural characteristics such as preferential exposure of reactive crystal facets, high stability, and facile electron transport. Great advances in the synthesis of electrocatalysts based on the metallic nanowires and nanotubes have been made with enhanced electrocatalytic activity and durability. This review summarizes the research progress made on synthesizing 1D metal electrocatalysts using different synthetic strategies, including template-assisted method, electrospinning, and template-free wet-chemical synthesis, with an emphasis on the electrocatalytic performance of these 1D nanomaterials.

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Enhanced stability and activity of PtRu nanotubes for methanol electrooxidation

Cited by 30 publications

References 19 publications

Highly Porous and Preferentially Oriented {100} Platinum Nanowires and Thin Films

Highly Porous and Preferentially Oriented {100} Platinum Nanowires and Thin Films

Nanoporous PtCo and PtNi alloy ribbons for methanol electrooxidation

An Overview of One-Dimensional Metal Nanostructures for Electrocatalysis

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