Synthesis and enhanced electrocatalytic properties of Au/Pd/Pt nanohollows

Chen, Yong-Xiang; Lai, Shiqin; Jiang, Shaoling; Liu, Yan; Fu, Chenglin; Li, Aiqing; Chen, Yuyu; Lai, Xuandi; Hu, Jianqiang

doi:10.1016/j.matlet.2015.05.009

Cited by 14 publications

(11 citation statements)

References 15 publications

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“…Gold and palladium nanoparticles present the characteristic oxidation (Ox Pd and Ox Au ) and reduction (Red Au and Red Pd ) peaks related to the formation and reduction of the surface metal oxides [24,35,36,37]. Palladium voltammogram is shifted in the cathodic region, indicating the higher stability of the palladium oxide with respect to the gold one.…”

Section: Resultsmentioning

confidence: 99%

Au-Based Catalysts: Electrochemical Characterization for Structural Insights

et al. 2016

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Au-based catalysts are widely used in important processes because of their peculiar characteristics. The catalyst performance depends strongly on the nature and structure of the metal nanoparticles, especially in the case of bimetallic catalysts where synergistic effects between the two metals can be occasionally seen. In this paper, it is shown that electrochemical characterisation (cyclovoltammetry CV and electrochemical impedance spectroscopy EIS) of AuPd systems can be used to determine the presence of an electronic interaction between the two metals, thus providing a strong support in the determination of the nature of the synergy between Au and Pd in the liquid phase oxidation of alcohols. However, it seems likely that the strong difference in the catalytic behavior between the single metals and the bimetallic system is connected not only to the redox behaviour, but also to the energetic balance between the different elementary steps of the reaction.

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Section: Resultsmentioning

confidence: 99%

Au-Based Catalysts: Electrochemical Characterization for Structural Insights

et al. 2016

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“…44,48 These studies investigate the synthesis of larger (20−50 nm) hollow NPs, cubes, or solid particles of Au/ Ag/Pt, 49,50 Au/Ag/Pd, 44,51 and Au/Pd/Pt. 43 To the best of our knowledge, wet-chemical synthesis of significantly smaller (3−5 nm) Au/Ag/Pd alloy NPs with control over morphology and size dispersity has not been reported. Thus, initial efforts were focused on the synthesis of ternary alloy NPs with narrow size dispersity to understand the physical properties.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Despite significant advances in the synthesis of bimetallic alloy NPs, size- and shape-controlled synthesis of ternary and quaternary noble metal nanostructures has not been thoroughly investigated. A few reports include Au/Pt/Ag, Au/Pt/Pd, and Ag/Au/Pd larger (20–50 nm) hollow particles and nanoboxes that exhibit enhanced catalytic performance in electro-oxidation of alcohols. Likewise, multimetallic nanostructures composed of noble and non-noble elements have also been reported including PtPdCu, Pt–Ni–Cu, Au@PdPt, Ag(Au)/CuPd, and Pd–Ni–Pt alloys and core–shell nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Shape Controlled Synthesis of Au/Ag/Pd Nanoalloys and Their Oxidation-Induced Self-Assembly into Electrocatalytically Active Aerogel Monoliths

et al. 2017

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The synthesis of size and shape controlled Au/Ag/Pd alloy nanoparticles (NPs) and their self-supported assembly into monolithic aerogels for electro-oxidation of ethanol is reported. Two distinct morphologies of ultrasmall (3–5 nm) Au/Ag/Pd alloy NPs were produced via stepwise galvanic replacement of thiol-coated Ag NPs. The resultant nanoalloys were self-assembled into large, free-standing, aerogel superstructures that exhibit direct NP connectivity, high surface area (269 ± 18.1–76 ± 6.4 m2/g) and mesoporosity (2–50 nm), and high electrocatalytic activity via controlled oxidation of the surfactant ligands. The gelation kinetics have been tuned by varying the oxidant/surfactant molar ratio that governs the acidity of sol–gel reaction and consequently the extent of Ag dealloying with in situ generated HNO3. As-synthesized Au/Ag/Pd aerogels exhibit polymeric or colloidal gel morphology that can be manipulated by varying the shape and composition of precursor NPs. The electrocatalytic activity of ternary alloy aerogels for oxidation of ethanol was investigated using cyclic voltammetry and chronoamperometry. The monolithic aerogels exhibit high catalytic activity and durability, which is ∼20–30 times greater than those of the discrete Au/Ag/Pd alloy NPs. The polymeric morphology of high Pd-containing alloy aerogels resulted in ∼1 order of magnitude higher current density and mass activity in comparison to low Pd-containing colloidal aerogels. The synergistic effect of trimetallic alloy mitigates the catalyst poisoning effects and increases the stability and durability while the self-supported superstructure with direct NP connectivity, high surface area, and mesoporosity offers a facile conduit for both molecular and electron transport, enabling Au/Ag/Pd aerogel as a high-efficiency electrocatalyst.

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“…Based on these advantages, Au nanocage has been widely used in the fields of drug controlled release systems [69], biosensing [70] Electrochemical method is a process of applying a certain current or voltage to a noble metal electrolyte system to cause an electrochemical reaction (anodization, electrolysis, deposition) to obtain a noble metal nanomaterial. Among them, electrochemical anodic oxidation can effectively regulate the size and morphology of nano-products by controlling the experimental conditions such as electrode voltage, electrolyte composition, ionic strength and time [60]. Adding a coordination stabilizer into the electrolyte solution can be effectively prevented from agglomeration of particles and control the nanostructure.…”

Section: Nanocagementioning

confidence: 99%

Noble Metal Nanostructured Materials for Chemical and Biosensing Systems

et al. 2020

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Nanomaterials with unique physical and chemical properties have attracted extensive attention of scientific research and will play an increasingly important role in the future development of science and technology. With the gradual deepening of research, noble metal nanomaterials have been applied in the fields of new energy materials, photoelectric information storage, and nano-enhanced catalysis due to their unique optical, electrical and catalytic properties. Nanostructured materials formed by noble metal elements (Au, Ag, etc.) exhibit remarkable photoelectric properties, good stability and low biotoxicity, which received extensive attention in chemical and biological sensing field and achieved significant research progress. In this paper, the research on the synthesis, modification and sensing application of the existing noble metal nanomaterials is reviewed in detail, which provides a theoretical guidance for further research on the functional properties of such nanostructured materials and their applications of other nanofields.

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Synthesis and enhanced electrocatalytic properties of Au/Pd/Pt nanohollows

Cited by 14 publications

References 15 publications

Au-Based Catalysts: Electrochemical Characterization for Structural Insights

Au-Based Catalysts: Electrochemical Characterization for Structural Insights

Shape Controlled Synthesis of Au/Ag/Pd Nanoalloys and Their Oxidation-Induced Self-Assembly into Electrocatalytically Active Aerogel Monoliths

Noble Metal Nanostructured Materials for Chemical and Biosensing Systems

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