ZnO–CuO core–branch nanocatalysts for ultrasound-assisted azide–alkyne cycloaddition reactions

Developing catalytic systems with high efficiency and selectivity is a fundamental issue for photochemical carbon dioxide conversion. In particular, rigorous control of the structure and morphology of photocatalysts is decisive for catalytic performance. Here, we report the synthesis of zinc oxide-copper(I) oxide hybrid nanoparticles as colloidal forms bearing copper(I) oxide nanocubes bound to zinc oxide spherical cores. The zinc oxide-copper(I) oxide nanoparticles behave as photocatalysts for the direct conversion of carbon dioxide to methane in an aqueous medium, under ambient pressure and temperature. The catalysts produce methane with an activity of 1080 μmol gcat −1 h−1, a quantum yield of 1.5% and a selectivity for methane of >99%. The catalytic ability of the zinc oxide-copper(I) oxide hybrid catalyst is attributed to excellent band alignment of the zinc-oxide and copper(I) oxide domains, few surface defects which reduce defect-induced charge recombination and enhance electron transfer to the reagents, and a high-surface area colloidal morphology.

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“…Rapid cooling and separation yielded ZnO-Cu 2 O nanoparticles (Fig. 1a) 22 . The transmission electron microscopy (TEM) image in Fig.…”

Section: Resultsmentioning

confidence: 99%

Colloidal zinc oxide-copper(I) oxide nanocatalysts for selective aqueous photocatalytic carbon dioxide conversion into methane

et al. 2017

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“…[6,7] In particular,t he branches were commonly composed of surfaces with highindex facets, resulting in remarkable activities in variousc atalytic reactions. [8,9] Among these branched structures, octapods with eight arms were frequently found in face-centered cubic noble metals. [10][11][12][13] Whether the kinetic growth was guideda long the < 111 > direction,o rt he selective etchingo ccurred on the {100} and {110} facets, the resulting eight vertices protruded from the cubic centers and generated the octapods.S everal metal oxide nanoparticles also showed as imilar octapod morphology.…”

Section: Introductionmentioning

confidence: 99%

Selective Growth and Structural Analysis of Regular MnO Nanooctapods Bearing Multiple High‐Index Surface Facets

Shin

Kim

Song

2015

Chemistry An Asian Journal

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Although numerous morphologies of MnO nanostructures have been reported, an exact structural analysis and mechanistic study has been lacking. In the present study, the formation of regular MnO octapods was demonstrated in a simple procedure, comprising the thermal decomposition of manganese oleate. Because of their structural uniformity, an ideal three-dimensional model was successfully constructed. The eight arms protruded from the cubic center with tip angles of 38° and surface facets of {311} and {533} with rounded edges. The concentrations of oleate and chloride ions were the determining factors for the octapod formation. Selective coordination of the oleate ions to the {100} faces led to edge growth along the <111> direction, which was then limited by the chloride ions bound to the high-index surface facets. These structural and mechanistic analyses should be helpful for understanding the complex nanostructures and for tuning their structure-related properties.

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“…Park et al . synthesized novel CuO‐anchored hybrid ZnO nanoparticles by the controlled reduction of the copper precursor onto polycrystalline ZnO spheres.…”

Section: Nano‐particles Catalyzed Ultrasound‐assisted Organic Transfomentioning

confidence: 99%

Ultrasound and Nano‐Catalysts: An Ideal and Sustainable Combination to Carry out Diverse Organic Transformations

Banerjee¹

2019

ChemistrySelect

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The nano-sized catalysts are more effective than the traditional homogeneous or heterogeneous catalysts in bulk state. On the other hand, ultrasound-assisted strategy offers several advantages such as higher reaction rates, better yields, cost effective, environmentally benign as compared to traditional methods.Therefore, a fruitful combination of nano-catalyst and ultrasound is one of the effective tools to carry out diverse organic transformations. The present review deals with the latest developments on various nano-particles catalyzed organic synthesis under the influence of ultrasonic irradiation.

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ZnO–CuO core–branch nanocatalysts for ultrasound-assisted azide–alkyne cycloaddition reactions

Cited by 49 publications

References 23 publications

Colloidal zinc oxide-copper(I) oxide nanocatalysts for selective aqueous photocatalytic carbon dioxide conversion into methane

Colloidal zinc oxide-copper(I) oxide nanocatalysts for selective aqueous photocatalytic carbon dioxide conversion into methane

Selective Growth and Structural Analysis of Regular MnO Nanooctapods Bearing Multiple High‐Index Surface Facets

Ultrasound and Nano‐Catalysts: An Ideal and Sustainable Combination to Carry out Diverse Organic Transformations

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