Au@PdAg core–shell nanotubes as advanced electrocatalysts for methanol electrooxidation in alkaline media

Yang, Wenke; Zhang, Qing; Peng, Cheng; Wu, Eyu; Chen, Shaowei; Ma, Yanyun; Hou, Jie; He, Yuexiao; Zhang, Bangkai; Deng, Lifei

doi:10.1039/c8ra08781d

Cited by 14 publications

(11 citation statements)

References 64 publications

(60 reference statements)

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“…Here, we present new synthetic approaches which enabled us to produce various types of 1D AuAg nanostructures with minimal polydispersity. The new synthetic process involved the preparation and controlled aging of the initial seeding reaction mixture at different temperatures (20,25,30,35 and 40 • C) for 18 h following the addition of ascorbic acid. The solutions were then diluted by a factor of 20 with water and the products were investigated by TEM ( Figure 1).…”

Section: Synthesis and Characterisation Of 1d Auag Nanostructuresmentioning

confidence: 99%

“…Furthermore, the use of 1D Pt and Pd nanomaterials, alloyed or decorated with Au, has shown significant catalytic activity owing to their synergistic effects and large surface areas [18,[25][26][27][28][29][30][31]. To this end, ultrathin nanowires (NWs) have become widely used in fuel cells, offering remarkable catalytic performances [32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

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One Dimensional AuAg Nanostructures as Anodic Catalysts in the Ethylene Glycol Oxidation

et al. 2020

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Direct alcohol fuel cells are highly promising as efficient power sources for various mobile and portable applications. However, for the further advancement of fuel cell technology it is necessary to develop new, cost-effective Pt-free electrocatalysts that could provide efficient alcohol oxidation and also resist cross-over poisoning. Here, we report new electrocatalytic materials for ethylene glycol oxidation, which are based on AuAg linear nanostructures. We demonstrate a low temperature tunable synthesis that enables the preparation of one dimensional (1D) AuAg nanostructures ranging from nanowires to a new nano-necklace-like structure. Using a two-step method, we showed that, by aging the initial reaction mixture at various temperatures, we produced ultrathin AuAg nanowires with a diameter of 9.2 ± 2 and 3.8 ± 1.6 nm, respectively. These nanowires exhibited a high catalytic performance for the electro-oxidation of ethylene glycol with remarkable poisoning resistance. These results highlight the benefit of 1D metal alloy-based nanocatalysts for fuel cell applications and are expected to make an important contribution to the further development of fuel cell technology.

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Section: Synthesis and Characterisation Of 1d Auag Nanostructuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

One Dimensional AuAg Nanostructures as Anodic Catalysts in the Ethylene Glycol Oxidation

et al. 2020

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“…Co/Co(OH) 2 /G was synthesized via chemical reduction strategy with hydrazine hydrate as reducing agent The Ru/Co/Co(OH) 2 /G sample was obtained by galvanic displacement reaction method . X‐ray diffraction (XRD) measurements for the Co/Co(OH) 2 /G and Ru/Co/Co(OH) 2 /G catalysts were carried out to gain the crystallite phase of Ru or Co‐containing and the results are given in Figure .…”

Section: Figurementioning

confidence: 99%

Tiny Ruthenium‐Cobalt‐Cobalt Hydroxide Nanoparticles Supported on Graphene for Efficiently Catalyzing Naphthalene Complete Hydrogenation

et al. 2019

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The nanocatalyst of graphene‐supported ruthenium/cobalt/cobalt hydroxide nanoparticles (denoted as Ru/Co/Co(OH)2/G) was obtained at ambient temperature by using chemical reduction with hydrazine hydrate as reducing agent and galvanic replacement reaction methods. The nanostructure of Ru nanoclusters‐on‐cobalt‐on‐cobalt hydroxide nanoparticles (NPs) has been proved in Ru/Co/Co(OH)2/G by X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), high resolution TEM (HRTEM), scanning transmission electron microscopy‐energy dispersive X‐ray spectroscopy (STEM‐EDS) elemental line scanning and mapping analysis, and high‐sensitivity low‐energy ion scattering (HS‐LEIS) measurement techniques. The Ru/Co/Co(OH)2/G catalyst showed excellent catalytic activity and 100% selectivity toward decalin for naphthalene hydrogenation reaction at the reaction temperature of 100 °C under initial 4.48 MPa hydrogen pressure probably owing to the synergetic effect of Ru, Co and Co(OH)2 active sites.

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“…[22] Typical seeds include noble metal nanocrystals with a polyhedral morphology, such as Au. [23] This is because of the mature technology for fabricating these nanoparticles with high uniformity in terms of size and morphology. The morphology/ symmetry of shell is typically conformal to that of seeds.…”

Section: Introductionmentioning

confidence: 99%

Seeded Growth of Au@PdAg Alloy Core‐Shell Nano‐Dendrites with Tunable Size and Composition

Zhang

Liu

et al. 2020

Eur J Inorg Chem

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We report a facile synthesis of Au@PdAg alloy core‐shell nanocrystals in dendrite form, having tunable size and composition. In particular, using spherical Au nanoparticles as seeds, the co‐reduction of Pd and Ag precursor in growth stage results in the formation of PdAg alloy shells with a dendrite shape. Their size and elemental composition can be tuned by varying the seed amount and feeding ratio in Pd and Ag precursor, respectively, illustrating the versatility of the current synthetic strategy. The size, morphology, and elemental composition of the products have been characterized using a set of techniques, including SEM, TEM, XRD, XPS, HAADF‐STEM, and EDX‐STEM mapping. When working as electrocatalysts, the current Au@PdAg alloy core‐shell nanocrystals supported by carbon black exhibit enhanced activity and excellent operation stability for electroxidation of ethanol as compared to commercial Pd/C. The current work offers a feasible strategy to preparation of multi‐metallic core‐shell dendritic nanocrystals with controllable size and composition and could find important use in fuel cells and related fields.

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Au@PdAg core–shell nanotubes as advanced electrocatalysts for methanol electrooxidation in alkaline media

Abstract: Au@PdAg core–shell nanotubes using the galvanic displacement reaction were prepared and they exhibited excellent electrocatalytic performance towards methanol electrooxidation.

Cited by 14 publications

References 64 publications

One Dimensional AuAg Nanostructures as Anodic Catalysts in the Ethylene Glycol Oxidation

One Dimensional AuAg Nanostructures as Anodic Catalysts in the Ethylene Glycol Oxidation

Tiny Ruthenium‐Cobalt‐Cobalt Hydroxide Nanoparticles Supported on Graphene for Efficiently Catalyzing Naphthalene Complete Hydrogenation

Seeded Growth of Au@PdAg Alloy Core‐Shell Nano‐Dendrites with Tunable Size and Composition

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