Gold–copper alloyed nanorods for metal-catalyzed organic reactions: implication of surface ligands on nanoparticle-based heterogeneous catalysis

Jenkins, Samir V.; Chen, Shutang; Chen, Jingyi

doi:10.1016/j.tetlet.2015.03.041

Cited by 20 publications

(19 citation statements)

References 26 publications

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“…Because of the advances of ambient pressure techniques for surface analysis, surface reconstruction of bimetallic NPs during catalytic reactions has been extensively investigated. [106][107] In practice, some pretreatments, such as thermal annealing, 108 acid washing, 109 phase transfer process 110 and hydrogen absorption/desorption, 111 have been developed for transforming the surface composition of bimetallic NPs, resulting in enhanced activity and/or selectivity. [112][113] In addition, to efficiently reuse the bimetallic NPs, the leaching/dissolution problem should be tackled.…”

Section: Discussionmentioning

confidence: 99%

Controllable Catalysis with Nanoparticles: Bimetallic Alloy Systems and Surface Adsorbates

2016

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Transition metal nanoparticles are privileged materials in catalysis due to their high specific surface areas and abundance of active catalytic sites. While many of these catalysts are quite useful, we are only beginning to understand the underlying catalytic mechanisms. Opening the "black box" of nanoparticle catalysis is essential to achieve the ultimate goal of catalysis by design. In this Perspective we highlight recent work addressing the topic of controlled catalysis with bimetallic alloy and "designer" adsorbate-stabilized metal nanoparticles.

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Section: Discussionmentioning

confidence: 99%

Controllable Catalysis with Nanoparticles: Bimetallic Alloy Systems and Surface Adsorbates

2016

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“…Given the confirmed suitability of nanoporous metals for applications based on their optical and catalytic properties along with the remarkable tunability of structure and composition of NPG, [15,[17][18][19][20] the de-alloying study in the system Cu-Au is worth pursuing. Moreover, the results of FA oxidation testing not only showed good activity and durability performance of Pt-coated Cu3Au nanorods and but also revealed unusually enhanced activity of Au enriched structures resulting from their de-alloying.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and testing of Pt-NPG catalysts developed by de-alloying of electrodeposited CuxAu(1−x) thin films

Xia

Achari

Ambrozik

et al. 2017

Materials Research Bulletin

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Electrodeposited CuxAu(1-x) thin films with different compositions have been found to undergo selective dissolution (de-alloying) in three specific potential ranges unlike their bulk counterparts known to de-alloy at composition dependent critical potentials. The general potential trend associated with coexistence of different thermodynamically stable alloy phases suggests increasing de-alloying rate in positive direction with the decreasing Cu content in the alloy. Following de-alloying, the resulting nanoporous Au (NPG) thin films exhibit significant surface area (SA) development, manifested by about threefold increase in comparison with de-alloyed AgxAu(1-x) precursor counterparts. SEM characterization have seconded the SA results by revealing a finer structure of the NPG films which feature pores and ligaments of less than 10 nm. Formic acid oxidation tests suggest that the platinization of accordingly synthesized NPG thin films leads to the synthesis of catalysts exhibiting initial mass activities of 3-5 A.mg-1 (combined Pt-Au catalyst) and withstanding more than 2500 potential cycles.

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“…This morphological and compositional transformation is accompanied by a color change from pink to blue (Figure 1d). It is noted that structures produced in this manner are free of the ligands which can inhibit catalytic activity [42][43] and may result in deviations from first order kinetics. 44 The morphological transformation which occurs during the assembly process was assessed using scanning electron microscopy (SEM).…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Enhancements to the Reduction of 4-Nitrophenol by Resonantly Excited Triangular Gold–Copper Nanostructures

et al. 2015

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The reduction of 4-nitrophenol to 4-aminophenol by sodium borohydride serves as a well-established model reaction for assessing the catalytic activity of metal nanoparticles. While many of the studied nanoparticles are plasmonic in nature, there is little understanding of whether significant photocatalytic enhancements to the reaction rate are achievable. Here, we assess the catalytic and photocatalytic properties of highly faceted, substrate-immobilized nanoprism-like AuCu structures synthesized using a vapor phase templated-assembly technique.The so-formed structures have a bimetallic composition which is well-recognized for its catalytic capabilities as well as a strong localized surface plasmon resonance in the visible spectrum which gives rise to enhanced near-fields at the tips of the triangle. Using a dip catalyst modality, the structures are demonstrated as heterogeneous photocatalysts with a 32-fold enhancement to the reaction rate when resonantly illuminated with 10 mW/cm 2 laser light. The study demonstrates the potential of such structures as photocatalysts and validates the reduction of 4-nitrophenol as a reaction useful in assessing the photocatalytic capabilities of plasmonic nanostructures.

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Gold–copper alloyed nanorods for metal-catalyzed organic reactions: implication of surface ligands on nanoparticle-based heterogeneous catalysis

Cited by 20 publications

References 26 publications

Controllable Catalysis with Nanoparticles: Bimetallic Alloy Systems and Surface Adsorbates

Controllable Catalysis with Nanoparticles: Bimetallic Alloy Systems and Surface Adsorbates

Synthesis, characterization, and testing of Pt-NPG catalysts developed by de-alloying of electrodeposited CuxAu(1−x) thin films

Photocatalytic Enhancements to the Reduction of 4-Nitrophenol by Resonantly Excited Triangular Gold–Copper Nanostructures

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